Tag Archives: USA

Allied Radio Corporation | Knight | Chicago Illinois

Knight Catalog 1964
Knight Catalog 1964

The company was started by Simon “Sy” Wexler in 1928. Allied Radio was an American radio manufacturer and retailer, which sold radio sets, tubes, capacitors (also known as electronic components), amateur radio equipment, citizen’s band (CB) radios, miscellaneous communications equipment, electronic kits, and consumer audio systems through retail stores and mail-order.

In 1962, The first industrial catalog was released for its commercial supplier division under the name of Allied Electronics. Through the 1960s both divisions would be headquartered in Chicago. Allied Radio would change ownership in 1970 when Radio Shack’s parent company (Tandy Corporation) bought both Allied Radio & Allied Electronics. In 1999 the company was acquired by Electrocomponents, the largest catalog distributor in the world.

Vintage Allied Knight Tube Radio Tuner Amplifier Receiver Model 730 SX 730 Rare!

$349.95
End Date: Saturday May-13-2017 8:09:44 PDT
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VTG Knight Tube Audio HI-FI Preamp Amplifier Working Mono Model 94 SX 706

$120.00
End Date: Tuesday May-23-2017 11:15:05 PDT
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Vintage Electro-Voice Regency Speaker with Knight Tube Amplifier

$1,000.00
End Date: Thursday May-18-2017 18:13:28 PDT
Buy It Now for only: $1,000.00
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Magnavox | 1921 | AC-2 Amplifier | SOLD

Magnavox | 1921 | AC-2 Amplifier
Magnavox | 1921 | AC-2 Amplifier
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Seller assumes all responsibility for this listing.
Item location: United States
Ships to: Worldwide
Sold for US $887.00 [ 16 bids ]

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Here’s a magnificent 1921 Magnavox AC-2 amplifier. The amp is original, it’s working, it’s in excellent condition (still has its original Magnavox hang tag and cabinet label), and it comes a good pair of early, tipped amber glass UV-201 tubes. The tubes have been tested in the amplifier, and they still work. The AC-2 was designed to be used with either radio or PA input, with B+ plate voltages running as high as 90v. It can be used with almost any 1920’s battery radio or crystal set and can be powered by either dry cell batteries or a regulated DC power supply (such as an ARBEIII).

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As you can see in the photos, the condition of this amplifier is excellent throughout. The panel is beautiful and undamaged, with legible engraved lettering and original nickel plating on the control assembly that still gleams. Cabinet is likewise in excellent condition, with an original finish that’s still as smooth as satin and an original full-color Magnavox decal that’s almost perfect. Chassis is clean and correct and original, and the huge original Magnavox AF transformer is still good. The 1st stage rheostat is open on a single turn at the very beginning of its travel, but this has no effect on the functionality of the amp, as the rheostat is in the off position when the stator is at that setting anyhow. Both rheostats gradually raise and lower the voltage, as they should, and both amplifier stages work properly, as you toggle each one off and then on. A few of the binding post nuts have worn threads, but they can still tighten down on battery wires.

The Magnavox license on the underside of the base is original and the original hang tag is in excellent condition. If you want to operate the amp, you’ll need a regulated DC power supply or high current, low voltage dry cells for the tube filaments (1 amp) and high voltage, low current batteries for the tube plates. Please note: this is not an AC amplifier. You do don’t simply plug it into a wall outlet. Also, it must be impedance matched to both input and output devices, and it was designed to be used with early 1920’s radio and public address devices, not 1950’s audio gear. Please know what you’re bidding on. Depending on what type of input device you’re using, and how that device is grounded, a separate, dedicated DC power supply may be required for the amp.

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EICO | ST-40 (ST40) Stereo Tube Amplifier | SOLD

EICO ST-40 STEREO TUBE AMP
EICO ST-40 STEREO TUBE AMP
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Item location: United States | Ships to: Worldwide
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EICO stereo tube amplifier model ST-40. This amp is a 1 owner amplifier, was used up until 4 months ago and has the original build instruction manual. I brought the amplifier up on my variac to 120 volts where i was getting nice clear output. All function work correctly except the loudness switch, when i click it on the volume cuts down, but works fine when off.

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The tube compliment is 4-7591’s, 2-12AX7’s, 4-12DW7’s and 1-5AR4. The 7591’s are original and still test good, the amperex 12AX7’s are also original and test good. One of the 4 12DW7’s is missing, i used a personal tube to test the amp. The 5AR4 rectifier is a vintage american. Cosmetic wise this amplifier is in great condition, the chassis is clean and has only a few minor scratches that are not to noticable from a distance, see pictures.

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Eico HF-87 Tube Stereo Amp

$800.00
End Date: Wednesday May-24-2017 18:26:59 PDT
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EICO Model 20 MONO TUBE Unbuilt Kit AMPLIFIER RARE Vtg Htf Audiophile

$599.00
End Date: Monday May-1-2017 17:42:17 PDT
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New EICO HF 20 MONO TUBE Unbuilt Kit AMPLIFIER Nos RARE Vtg Htf Audiophile

$999.00
End Date: Thursday Apr-27-2017 16:08:55 PDT
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EICO AF-4 INTEGRATED SINGLE ENDED SE RARE TUBE AMPLIFIER Working Amazing

$599.00 (0 Bids)
End Date: Thursday Apr-27-2017 12:19:30 PDT
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Heathkit Tube Amplifier W4-AM | SOLD

Heathkit W4-AM Power Tube Amplifier
Heathkit W4-AM Power Tube Amplifier
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Seller assumes all responsibility for this listing.
Item location: United States | Ships to: Worldwide
Sold for US $190.50

The tubes lit up as they should when plugged in. I pulled the tubes, It does not come with tubes. It has a capacitor can with a cracked base. It is selling as is as seen in the photos.

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Audio Research LS15 Preamplifier | SOLD

Audio Research LS15 Preamplifier
Audio Research LS15 Preamplifier

Seller assumes all responsibility for this listing.
Item location: United States | Ships to: Worldwide
Sold for: US $1,360.00

Audio Research LS15 Preamplifier with Original Box/Remote/Manual. This unit is in perfect working order with low hours. Besides some very minor scratches, this unit is in excellent cosmetic condition.

 

 

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Other Audio Research Amplifier

NOS RARE ORIGINAL PAIR BLACK FACEPLATE FOR AUDIO RESEARCH SP10 MK I/II PREAMP

$995.00
End Date: Wednesday May-24-2017 17:14:57 PDT
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Audio Research LS-7 Vacuum Tube Preamplifier - Excellent Condition / Video Demo!

$895.00
End Date: Saturday Apr-29-2017 11:08:18 PDT
Buy It Now for only: $895.00
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audio research tube amplifier

$713.00 (6 Bids)
End Date: Friday Apr-28-2017 13:09:21 PDT
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Audio Research SP-3 Preamplifier SP3

$1,500.00 (0 Bids)
End Date: Thursday Apr-27-2017 20:07:40 PDT
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Masco (Western Electric) MA-17 AMP | SOLD

Masco (Western Electric) MA-17 AMP
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Seller assumes all responsibility for this listing.
Item location: United States | Ships to: United States
This listing was ended by the seller.

Masco MA-17 Amplifier. This amp makes a terrific blue’s harp amp. Do a Google search and check it out. It was manufactured under Western Electric patents as the License notification indicates. The capacitors look to be all original. I recently acquired the amp. I brought it up with a variac and tested it. The amp passed a signal but the amp had a low output and distorted the signal. I tested the caps on an LCR meter; they are mostly out of spec. Clearly the amp needs to be electrically rebuilt. This is a great opportunity to get a nice amp that has not been hacked and rebuild it the way you want it tailored to your sound. Sold as-is.

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Other Western Electric Amplifier

Rare Western Electric 124B Tube Amplifier - 1940's

$6,000.00 (1 Bid)
End Date: Sunday Apr-30-2017 19:13:31 PDT
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IPC AM-1001 tube power amplifiers, ser. 4920 /4922, licensed by Western Electric

$4,500.00
End Date: Thursday May-25-2017 1:10:30 PDT
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IPC Western Electric 1027 6L6 6SL7 5R4 Tube Theater Amplifier

$1,500.00
End Date: Sunday Apr-30-2017 7:06:57 PDT
Buy It Now for only: $1,500.00
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HICKOK Tube tester KS-15750-L1 Western Electric Calibrated Audio 300B Military

$1,650.00 (0 Bids)
End Date: Monday May-1-2017 7:02:59 PDT
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Hammond AO35 (AO-35) Reverb Amp | SOLD

Hammond AO35 (AO-35) Reverb Amp
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Seller assumes all responsibility for this listing.
Item location: United States | Ships to: United States
Item has been sold.

Hammond AO35 reverb Amp. These amps make great guitar amps with a little conversion work. Do a Google search for more information. The amp powers up and passes a signal. Sounds good as is. It looks to have all original caps and other components.

Other Hammond Amplifier

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Homebrew 6BQ5 EL84 Mono Tube Amplifier

Homebrew 6BQ5 EL84 Mono Tube Amplifier
Homebrew 6BQ5 EL84 Mono Tube Amplifier
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Seller assumes all responsibility for this listing.
Item location: United States | Ships to: Worldwide
Sold for 70 USD

Here is a very cool old 1950’s Vintage Homebrew 6BQ5 / EL84 Mono Tube Amplifier Amp with a Triad 14A transformer & an Amperex Bugle Boy EZ81. It comes with 2- GE/Mullard 12AX7’s made in Great Britain, 2- Raytheon 6BQ5’s and an Amperex Bugle boy 6CA4/EZ81 as shown. It measures about 11″w x 8″d x 6″h at 15 lbs. This will make an excellent addition to anyone’s collection. Money back guarantee you will not be disappointed.

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David Bogen | CHB-100 Tube Amplifier | SOLD

Bogen | CHB-100 | Tube Amplifier
Bogen | CHB-100 | Tube Amplifier

Seller assumes all responsibility for this listing.
Item location: United States | Ships to: United States
Sold for US $129.00

Bogen CHB-100 Tube Amplifier. 100 watts output. The amp works and sounds good, but the output tubes are not included. It uses four 7868 output tubes, but will run on two output tubes. The rest of the tubes are included. As you can see, the cosmetics are a little rough. With a little modification, these make great guitar amps.

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David Bogen | ST-10 Tube Amplifier |

David Bogen | ST-10 Tube Amplifier
David Bogen | ST-10 Tube Amplifier
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Seller assumes all responsibility for this listing.
Item location: United States | Ships to: United States
This listing has ended.

 

 

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Bogen ST-10 Tube Amplifier. The amp is extremely versitile. It allows for output from the preamp section, the cathode follower and the full amplification stages. I will include a schematic with the amp showing the various configurations. It uses 6AQ5 output tubes in push-pull configuration. The amp sounds very good.

 

 

 

Other Bogen Tube Collectibles

Bogen DB212 Integrated Stereo Tube Amplifier

$399.99
End Date: Thursday May-25-2017 6:06:28 PDT
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Vintage BOGAN Model MO100 Tube Amplifier-Fully Functioning-Clean-Sounds Great!

$449.99
End Date: Friday May-19-2017 23:58:09 PDT
Buy It Now for only: $449.99
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Bogen AP-30 Integrated Tube Amp 15 Watts x 2 Tube Stereo a-82 & tp 250 tuner

$500.00
End Date: Wednesday May-17-2017 19:07:52 PDT
Buy It Now for only: $500.00
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bogen amplifier GS 250 Model

$600.00
End Date: Friday May-12-2017 9:38:28 PDT
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EICO | HF-20 (HF20) Tube Amplifier | SOLD

EICO HF-20 (HF20) Tube Amplifier

Seller assumes all responsibility for this listing.
Item location: United States | Ships to: United States
Sold for US $249.00

EICO HF-20 Amplifier. The amplifier was recently serviced. It had the multi-section filter cap replaced along with the coupling capacitors. In addition, the output tubes were replaced with new Sovtec 6L6’s. The amp sounds great and is ready to use. Overall, it shows moderate general wear.

 

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Other Eico Amplifier

Eico HF-87 Tube Stereo Amp

$800.00
End Date: Wednesday May-24-2017 18:26:59 PDT
Buy It Now for only: $800.00
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EICO Model 20 MONO TUBE Unbuilt Kit AMPLIFIER RARE Vtg Htf Audiophile

$599.00
End Date: Monday May-1-2017 17:42:17 PDT
Buy It Now for only: $599.00
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New EICO HF 20 MONO TUBE Unbuilt Kit AMPLIFIER Nos RARE Vtg Htf Audiophile

$999.00
End Date: Thursday Apr-27-2017 16:08:55 PDT
Buy It Now for only: $999.00
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EICO AF-4 INTEGRATED SINGLE ENDED SE RARE TUBE AMPLIFIER Working Amazing

$599.00 (0 Bids)
End Date: Thursday Apr-27-2017 12:19:30 PDT
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Pair of Vintage Marantz Model 5 Amplifiers | SOLD

Marantz Model 5 | Mono Tube Amplifiers
Marantz Model 5 | Mono Tube Amplifiers
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Item location: United States | Ships to: Worldwide
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Vintage Pair of Marantz Model 5 Mono Amplifiers – VG Condition. A few capacitors were replaced (please see photos) and the units sounds even better than original. Unit is in 100% perfect working order with no hum/noise. This unit is in very good cosmetic condition and was in storage for many years.

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David Bogen | Challenger CH30 | Tube Amplifier

BOGEN | CHALLENGER CH-30 | AMPLIFIER
BOGEN | CHALLENGER CH-30 | AMPLIFIER
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Item location: United States
Ships to: See item description
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This is a great looking amp. It has the large style 6L6G tubes, and looks to have all original parts. It sounds good on all inputs. This would be great for using as a guitar or bass amp, even a harp amp. It comes with the top cover, and bottom cover. The cord was cracked so I replaced it with a 3 prong grounded cord.

Ships to: Americas, Asia, United Kingdom, Germany
 

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McIntosh C22 Preamplifier | Immaculate | SOLD

McIntosh | C22 Preamplifier
McIntosh | C22 Preamplifier
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Item location: United States | Ships to: Worldwide
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Vintage McIntosh C22 Preamplifier – 1 owner. Lightly used in Immaculate Condition with original 6 telefunken 12ax7 (tested 80 on tv7 with min 58). This unit is in perfect working order and in amazing cosmetic condition for its age (see photos). Comes with original manual, wood case and telefunken tubes. Shipping will be professionally double-boxed and include insurance.

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Dynamic Mutual Conductance Tube Tester | 600A

HICKOK 600A TUBE TESTER
HICKOK 600A TUBE TESTER
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Item location: United States | Ships to: United States
Sold for US $355.00 [ 12 bids ]

 

 

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This is a working Hickok 600A Dynamic Mutual Conductance Tube Tester. It is shown testing a 12AU7 tube. It is all original with all factory paperwork and manual. It has a beautiful gold anodized faceplate and the roll chart works nicely. Inside carrying case is nice but the outside of it is scruffy. All serial numbers match and is sold as is and as you see it in the pictures. It will come to you insured, well packed and be sure to ask any questions BEFORE you bid and NOT after. Don’t be fooled by the calibration people, unless these testers are physically or electrically damaged there are very few points to “calibrate” and they hold their calibration very well and load the tube being tested accurately. Buy it now on eBay!

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Marantz 9 Reissue | Tube Amplifier Pair | 230v 50Hz

Marantz 9 Reissue | Tube Amplifiers
Marantz 9 Reissue | Tube Amplifiers
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Seller assumes all responsibility for this listing.
Item location: Italy | Ships to: Worldwide
This listing has ended.

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MARANTZ 9 Reissue Tube S/N 10040 ,10050. Used, 100% all functions operate. External aesthetic conditions are excellent. These power amps work at 230v. Anyway please take note that: The reissue amps have many primary transformer taps to match voltages of 100V (Japan), 120 Volts USA, and 220V and 240V. The originals can not do this but the reissues have the taps to rewire.

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Many times they are cut short under the circuit board but can be spliced and connected. Original user guides, the two power cords and the original boxes are included. Few light scrathes are present on the black covers of the transformers. In the front alluminium covers only two points have a scartch (please look the red arrows). On request I ll be glad to send you more detailed photos. Made in USA by VAC.

Tubes installed in the two mono tube amps are :

  • 4 E88CC Philips SQ
  • 2 6CG7 General Electric
  • 8 6CA7/EL34 (I suppose Electro Harmonix or Gold Lion)
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Heathkit | XO-1 Electronic Crossover Unit

Heahkit XO-1
Heahkit XO-1

Seller assumes all responsibility for this listing.
Item location: United States | Ships to: Worldwide
Sold for US $250.00

Heahkit XO-1 Powered crossover network. This is a mono crossover unit. I have had a bit of fun using this with altec and jbl speakers. I took this unit to my service tech about a week ago for sevice. It only needed cleaning and testing. He cleaned and tested. no new parts needed. The tubed checked out as strong. They are heath branded mullards all three. They are 12ax7 and 6×4 which has a squre getter. Great tubes!

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Leak TL/25 Plus Tube Amplifier | Boxed

Leak TL25 Plus Tube Amplifier
Leak TL25 Plus Tube Amplifier
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Seller assumes all responsibility for this listing.
Item location: United States | Ships to: Worldwide
This listing has ended.

Item Details Condition:
I am listing a large amout of Vintage Hi-Fi stuff. I will combine shipping. I do not have much knowledge of these items, they have not been tested. These item were sent home by a GI and by the time he got home he had a family and they sat in a closet for over 30 years.

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Harman Kardon | A30K | A300 Tube Amp | SOLD

Harman Kardon A30K | A300 | Integrated Tube Amplifier
Harman Kardon A30K | A300 | Integrated Tube Amplifier
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Seller assumes all responsibility for this listing.
Item location: Italy | Ships to: Worldwide
This listing has ended.

 

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This is a very nice Harman Kardon A30K amplifier, serial number 6041830. The 30K is the kit version of the A300 amplifier. Electrically the 30K and 300 are identical. I never put power to these amps without first replacing the electrolytic and coupling capacitors and diodes. It is strongly recommended (Google ‘recapping radios’) that the electrolytic and coupling capacitors be replaced in old tube units. For the A300 there are a total of seven electrolytic capacitor sections in the power supply and a total of eight coupling capacitors to be replaced, which I have done. After restoration I also verified the B+ voltages and critical components are to specification. I also replace the rectifying diodes with more modern units that have fast turnoff/soft recovery, characteristics that provide a little less noise– makes for a cleaner power supply. No change in the sound of the amp, only just a cleaner power supply.

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These restorations do not modify the wonderful ‘tube sound’–no real modifications, but rather put back the way the HK engineers designed it, only make the unit safer and more reliable. See pictures, showing new components and before and after chassis refurb. (bottom cover removed for picture).

In addition to replacing the electrolytic and coupling capacitors, using premium 716 Series Sprague Orange Drops for the coupling capacitors, I have tested all the tubes on my B&K 707 tube tester—and replaced any that were marginal. I also have cleaned the tubes, tube sockets, controls and switches (Deoxit D5 contact cleaner for the tube sockets and switches, F5 Fader Lube for the potentiometers). The output tubes are performance matched Sylvania 7408’s with identical date codes of 1962, 26th week. The 7408 is a more rugged version of the 6V6, which are highly prized in tube amplifiers. For tube rollers, the 6V6 is a direct replacement for the 7408.

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I have verified all the operations. The controls and switches all function as designed. All the inputs are operational. I have run this unit 8 hours without any issues after the refurbishing. This unit has a very nice appearance, the faceplate is excellent for it’s age, the issue is a scratch on the upper LH corner, see pic. The vertical lines on the faceplate are from the lighting. This is one of the best A30K’s that I’ve had. The knobs also are in very good condition. Chassis has a few stains, chassis lettering is sharp and legible–see pictures. As a stereo integrated amplifier, there are inputs for lo level (magnetic) phono or tape head, hi level (ceramic) phono, tuner and auxiliary inputs. The controls are: Source Selector, Loudness (Volume), Bass, Treble, Balance, and Blend. Switches are provided for power, rumble filter, contour, equalization and stereo reverse

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David Bogen | Challenger CH18 Mono Tube Amp | SOLD

Bogen | Challenger CH18 Mono Tube Amp
Bogen | Challenger CH18 Mono Tube Amp
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Seller assumes all responsibility for this listing.
Item location: United States
Ships to: Worldwide
Sold for US $137.50

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While it has not been tested, as you can see from trhe pictures it is extremely clean-almost looks to be new, but the frayed cord attestes it must have been in use at some time. Still exceptional cosmetics for a vintage amp.
Rated at 18 watts.

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Amp is 14″ X 7″ X 8 1/8″tall. Weighs about 15 1/4 pounds.

The amp deck will be shipped via Fedex Ground within the United States. Ebay’s rate master does not support Fedex rates, so what you are seeing is UPS Ground rates. I strongly urge you to wait for an invoice after the auction ends before paying, as Fedex is usually less than UPS and I will bill you the lower amount for S&H.

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David Bogen | Challenger MX6 Dual Tube Amp | SOLD

Bogen Challenger MX6 Dual 12AX7 Tube Amplifier
Bogen Challenger MX6 Dual 12AX7 Tube Amplifier
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Seller assumes all responsibility for this listing.
Item location: United States
Ships to: United States and others
This listing has ended

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Vintage Challenger MX6 Pre-Amp. All of the tubes light up and are included……

2) 12AX7
1) 12AT7

There are 5 control knobs on the front for On/Off, Mic-1, Mic-2, Mic-3 and Mic-4. The back panel has four 1/4″ MIC Inputs and two 1/4″ Phono Inputs, plus a shielded wire with an RCA plug for the speaker output. We tested all inputs on this amp with a microphone using an 4 Ohm speaker for output. All the tubes light up and all capacitors stayed nice and cool during our testing. All of the knobs work and turn freely as they should but the output of this one is very faint. So it will need some work or possibly new tubes to bring it back up to its full potential.

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It looks like all the components underneath are still original and the chassis and cage are in good cosmetic condition as well (please see photos). So this one is a great candidate for a rebuild (I’ve heard one of these in good working order and they are VERY nice sounding amplifiers! It measures approximately 8″ x 5 3/8″ x 5″ and weighs about 8 lbs. unpacked.

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Knight KG-250 | Tube Stereo Amp | Mullard Tubes

Knight KG-250 Vintage Tube Stereo Amplifier
Knight KG-250 Vintage Tube Stereo Amplifier

Seller assumes all responsibility for this listing.
Item location: United States | Ships to: United States
Sold for US $158.50

Knight KG-250 Vintage Tube Stereo Amplifier Allied Radio Corp. Mullard Tubes!

Nice, vintage Knight KG-250 tube stereo amplifier. Has original (mostly Mullard) tubes with the exception of one tube. I hooked speakers up to it, powered up and could here signal coming thru both speakers. I’ll remove the tubes for safe shipping.

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Other Knight Amplifier

KNIGHT INTERGRATED AMPLIFIER MODEL No. 94-SZ 701 with PHONO 12AX7 Mono

$100.00
End Date: Saturday Apr-29-2017 5:06:56 PDT
Buy It Now for only: $100.00
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Knight Model 93SX312 6V6 Amplifier==Gorgeous Deco Look!

$149.00
End Date: Wednesday May-24-2017 8:38:19 PDT
Buy It Now for only: $149.00
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Allied Knight 93 SZ 682 tube mono block amplifier, 6L6

$445.00 (0 Bids)
End Date: Tuesday May-2-2017 17:58:44 PDT
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RARE VINTAGE Knight KG-870 Transistor Stereo Amplifier Amp Audiophile *WORKS*

$149.99
End Date: Sunday May-21-2017 6:04:53 PDT
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Audio Research | SP3A-1 Preamp | Gold Edition | SOLD

Audio Research | SP3A-1 Preamp | Gold
Audio Research | SP3A-1 Preamp | Gold
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Item location: United States | Ships to: Worldwide

Audio Research SP3A-1 Preampilifer – Black/Gold. All original. This vintage unit is in perfect working order and all original. It is in amazing cosmetic condition for its age. It is definitely a collector’s piece. The woodcase is near perfect. Comes with original wood case and manual. This listing has ended.

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Altec | Lansing 440 B Mono Pre-Amps Complete

Altec | Lansing 440 B Mono Pre-Amps
Altec | Lansing 440 B Mono Pre-Amps

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Item location: Germany | Ships to: Worldwide
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Altec Lansing 440 B Mono Pre-Amps with Wood Enclosure. These devices were of our engineer, 72 years old, has worked for 50 years with tubes, as in lab Engineer, technically completely restored and he found a lot of modification.( last picture shows his working place) there is no hum or any noise. the sound is fantastic….. also the condition is fantastic inside and outside. All defective electrolytic capacitors and stocks were again renewed, the tubes are measured. Original Woodcase are complete restored from an carpenter.

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Magnavox | 8802 6V6 | Stereo Tube Amplifier | SOLD

Magnavox | 8802 6V6 | Stereo Tube Amplifier
Magnavox | 8802 6V6 | Stereo Tube Amplifier
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Item location: United States
Ships to: United States
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Magnavox 8802 tube amplifier recently pulled from working, mint condition console. I cleaned it up, removed the molex connector and bridged the power circuit to bypass the power switch in the separate preamp but other than that the unit is as it was in the console. This amp works great as is but for stand alone use the 390k resistor modification is recommended to bypass the balance pot on the separate preamp this amp used inside the console.

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