Tube Amplifier Repairs and Modifications
Tone to the Bone!
Free System Check:
If your tube amp is sounding ugly, That is emitting noises other than a low level hum, you need to be sure which piece it
is - the amp, the guitar or the cord. If you don't have access to substitution pieces of known quality, we can provide
them. Just bring your system in for a FREE check.
Amp TuneUp: Does your tube amp crackle, hum, buzz, screech, howl, whistle, whoosh? Has its original
tone and volume become weak, dull or unnatural, or does it just give you the Silent Treatment? Our Tube Amp TuneUp will
either eliminate these annoyances or reveal their source.
The charge for this service is $50 to $100 depending on the
size of the amp, and includes:
- Test for AC shorts
- Test all Tubes - 100% conclusive on shorts, leaks, grid emmisions, transconductance
and life expectancy
- Test all electrolytic capacitors in power supply
- Check key voltage levels
- Inspect Reverb assembly
- Test Transformers
- Clean all pots, switches
and tube sockets - tighten where necessary
- Check all connections
- Test speakers
- Clean cabinet
- The cost of parts needed for repair (if any) is not
included, and they will not be installed until you know the cost and give us the go ahead. Free estimates are furnished upon
Repairs, Restorations and Modifications: The labor
rate is $30 per hour on services such as troubleshooting, speaker replacement, cabinet restoration, reverb reconditioning,
bias voltage adjustment, parts replacement, etc. Free estimates are written when you bring your gear in, and if unforeseen
costs arise, you will be contacted for approval.
It's true, life is impossible without Reverb, but what about the rest of it? If your tube amp has lost its
complete rich tone, from that powerful bass through those mellow mids to the crystal clear highs, YOU CAN GET IT ALL BACK!
Any components that have drfited too far off spec are eroding your tone and volume and should be replaced. You can have
just a few parts replaced, or have us install one of the many kits available from several outstanding suppliers.
amp's original appearance can be restored too, with new Tolex, and Speakercloth and brand new hardware on a stripped
and sanded cabinet.
|Fender Bassman Before
|Bassman with New Speaker Cloth
|Vox Buckinghm Before
|Vox Buckingham After
These are proven
ways to tailor the tone of your amp to your taste, increase its volume safely, and remove noise. Before any of these
modifications are done, we make sure that all the amp's circuits are functioning normally. The following prices are
guidelines that take into consideration the size and complexity of a wide range of amps. We will provide a Free
Estimate specific to your amp when you bring the gear in.
maximization, $50 - $100: There are many ways to increase volume, such as installing higher gain
tubes, changing resistor values, eliminating current drains, etc., without violating your tube amp's operating
- Tone Enhancement,
$50 - $200: Changing capacitor values in the Tone control circuit can alter the frequency response
of your amp dramatically, or subtly. There are also many prepackaged mod kits available from excellent sources that
we can install for you.
Conversions, $75 - $250: Take your Fender Silverface tube amp back to the"pre-CBS" era for
that ultra-clean sound, OR you can go the other way and add some bottom to your Blackface.
- Bias Voltage Circuits added or modified, $50 - $150:
For maximum efficiency of your tube amp's power stage, a matched set of power tubes AND an accurate bias adjustment are
essential. You will get better sound and longer tube life. Some amps have only a Bias Balance adjustment, but
the ability to adjust the Bias Voltage Level is equally important. Why balance an incorrect level?
- Master Volume Controls, $50-$75:
Play with an Overdrive sound at any volume level, without an overdrive pedal. Marshall owners, get rid
of that "power brake" which has fried many a good amp. You'll also be using fewer cables and have a totally
controlled distortion sound.
- Star Grounding Circuits,
$50 & up: AC Hum/Buzz is sometimes difficult to eliminate. If everything is correct
with your gear and you're still getting unacceptable levels of AC noise, a Star Grounding scheme may be necessary.
- DC Heater Conversions, $75 - $125: Manufacturers
avoid cost by running noisy AC to the heater elements of your tubes, which can be powered instead by quiet DC.