You just bought a new set of matched power tubes and your amp still sounds like crap?

The reason is, every time you replace power tubes you have to set the bias your amp. This gives it all the punch, crunch and natural compression you're after!

• We bias most major tube amps: Ampeg, Fender, Hiwatt, Marshall, Peavey, Vox, and more, using the “Groove Tube Bias Probe Method.”  It's fast, accurate and inexpensive. You will love the tone and playability! We do!

• All tube brands: Groove Tubes, Sovtek, Mesa Boogie, Fender, Ruby, Road, GE, Sylvania, RCA, you name it!

• We can retrofit fixed, balanced, and self biasing amps with adjustable circuits for the perfect bias setting.

• Marshall 6550 to EL-34 conversions.

• Control and contact cleaning.

• Plug and jack replacement.

• Power Capacitor replacement (depending on availability).

• Instrument, Mic, and Speaker cable fabrication and repair.

• Located in San Diego, Calif.

• Low Rates. A simple bias set is only $15.00 !!!

Email us for a quote today!
Click Here

Common Amp List

These can be biased with no modifications.

Ampeg
· SVT stock (not 6146) ~ 6550

Fender
· 100 W RMS w/ reverb & vibrato ~ 6L6
· 135 W RMS w/ reverb & vibrato ~ 6L6
· 70 W RMS w/ reverb & vibrato ~ 6L6
· Bandmaster Amp - black-face reverb ~ 6L6
· Bassman 100 ~ 6L6
· Bassman 135 ~ 6L6
· Deluxe Reverb w/boost ~ 6V6
· Dual Showman AC 568 ~ 6L6
· Pro Reverb AA 270 ~ 6L6
· Showman - black-face reverb ~ 6L6
· Super Reverb ~ 6L6
· Tremolux - black-face ~ 6L6
· Vibrolux Reverb AB 763 ~ 6L6

Hiwatt
· 200 Watt ~ KT-88

Marshall
· 100 Watt ~ 6550, EL 34 (6CA7)
· 50   Watt ~ 6550, EL 34 (6CA7)

Peavey
· Artist ~ 6L6
· Classic ~ 6L6
· Deuce ~ 6L6
· Deuce II Festival ~ 6L6
· Mace ~ 6L6
· Road Master ~ 6550
· Vintage ~ 6L6
· VTA 400, VTA 800 ~ 6550

Vox
· AC 50 ~ EL 34 (6CA7)
· V 125 Lead ~ EL 34 (6CA7)

*Other amps with fixed or self bias circuits should be checked and retrofitted if necessary.

Helpfull Links

Groove Tubes Tube Reference Guide

The stuff on tubes