Tube Amplifier Repair Service and Forum

Tube Amplifier Repair Service and Forum Jay Forbes has been repairing tube amplifiers for over 30 years. This page documents repairs made.

To inquire about getting your amplifier repaired, please send an email to: [email protected] or visit www.jfradiorepair.com Include make, model and condition (e.g. tubes missing, rust), I will respond with a rough estimate to repair. I look forward in discussing your repair issues and/or bringing your amplifier back to factory operating condition.

Fisher X-100a Repair
04/18/2019

Fisher X-100a Repair

Fisher X-100 Repair
12/08/2018

Fisher X-100 Repair

Fisher X202-b Repair
11/12/2018

Fisher X202-b Repair

Shengle Tube Amp Repair
10/31/2018

Shengle Tube Amp Repair

Bogen DB-10 Repair
10/04/2018

Bogen DB-10 Repair

Zenith Phono Repair
10/04/2018

Zenith Phono Repair

McIntosh MC225 Repair
10/02/2018

McIntosh MC225 Repair

McIntosh MC225 Repair
09/24/2018

McIntosh MC225 Repair

Telefunken Amp Repair
07/25/2018

Telefunken Amp Repair

Fender 5E3 Repair
07/25/2018

Fender 5E3 Repair

Fender 5E3 Repair
07/10/2018

Fender 5E3 Repair

Fisher X-100B Repair
06/29/2018

Fisher X-100B Repair

Fisher 500c - LED Light Install
03/29/2018

Fisher 500c - LED Light Install

Fisher 500c Repair
03/29/2018

Fisher 500c Repair

's cover photo
01/26/2018

's cover photo

EICO 2080 Amp Repair
01/23/2018

EICO 2080 Amp Repair

Fisher CA-880 -- Servicing
01/05/2018

Fisher CA-880 -- Servicing

01/05/2018
Fisher Amp - Noise Spike at Power Up

Why is meter Spiking at Power Up?
Is this Normal for a SS Amp?
If Normal, what circuit has failed to prevent this spike?
I'll post answer below after a few have responded.

Westinghouse Stereo Console
12/09/2017

Westinghouse Stereo Console

Realistic SAF-40D Repair
12/09/2017

Realistic SAF-40D Repair

Fisher X202b Repair
11/13/2017

Fisher X202b Repair

Heathkit W4AM Repair
07/01/2017

Heathkit W4AM Repair

Scott 299c Repair
04/05/2017

Scott 299c Repair

Scott 299c Repair
03/21/2017

Scott 299c Repair

Sometimes, dial glass should not be cleaned........................
02/19/2017

Sometimes, dial glass should not be cleaned........................

Bogen DB-212
02/07/2017

Bogen DB-212

Fisher 500c Receiver/Amplifier Repair
11/18/2016

Fisher 500c Receiver/Amplifier Repair

Before

Look at this stringing diagram.  What would you charge to restring?  I had NEVER seen anything so complicated (2 fixed a...
08/07/2016

Look at this stringing diagram. What would you charge to restring? I had NEVER seen anything so complicated (2 fixed and 2 moving pulleys...)

Customer wanted me to install 2 power XFMRs in his Scott amps, and restring the FM dial on his McIntosh receiver.  Units...
08/07/2016

Customer wanted me to install 2 power XFMRs in his Scott amps, and restring the FM dial on his McIntosh receiver.

Units also needed to be completely gone thru.

He did not accept my estimate and even tired to negotiate it down. Well, I don't do that. My rates are very low compared with many repairman out there. And I do not charge to give an estimate.

Needless to say, he went away pissed telling me, "I can find someone to do it cheaper. I wished him well.

Wurlitzer 528 Amplifier Repair
08/05/2016

Wurlitzer 528 Amplifier Repair

Timeline Photos
07/20/2016

Timeline Photos

03/20/2016

Grundig SO-112-PX -- Operating from Radio and New Phono.

Motorola Stereo Repair
06/12/2015

Motorola Stereo Repair

Repairing a Harman Kardon C100 Amp.
05/06/2015

Repairing a Harman Kardon C100 Amp.

Got this photofact from Ebay for a repair, as I could not find one online...
05/06/2015

Got this photofact from Ebay for a repair, as I could not find one online...

02/05/2015

Working on an Aronov pre-amp. Replaced 2 trim pots on the output. Had to create a wring diagram to assure no mistakes were made by the owner. Many wires broke in the process. Unit works well now.

01/30/2015

Set bias on 2 Golden Tube SE-40 Amps. What amazed me was that 10 of the 12 5881/6L6 tubes and 3 of the 4 6SN7 tubes were bad. Units "work". I did not like the amp as they are Class A amps.

01/30/2015

Customer did not elect to have me repair a Sherwood Tuner/Amp due to cost - mainly driven by tube replacement cost. Unit does work but needed all new output tubes.

01/26/2015
Coupling Capacitor Evaluation - Tube Amplifier

Here's the Coupling Cap Evaluation:
Results? Cheap $1 film caps sound the same as $50-$100 caps.

Sherwood S-8000 Tube Amplifier used to evaluate sound quality between Nine 0.22uf Coupling Capacitors of various types (poly, oil, etc.) in the output circui...

Address

21128 Stonecrop Pl
Ashburn, VA
20147

Opening Hours

Monday 09:00 - 18:00
Tuesday 09:00 - 18:00
Wednesday 09:00 - 18:00
Thursday 09:00 - 18:00
Friday 09:00 - 18:00
Saturday 09:00 - 18:00
Sunday 09:00 - 18:00

Telephone

(703) 729-9432

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