The Amp Garage

A 12AX7 sounds brighter than a 12AT7

Actually the Top Boost Vox installed later, comes pretty close to the tone of an EF86. (set the Treble and Bass Pots to zero or very low)

from the manual..

Rare find from a 1977 Mesa Boogie

I do. I split the signal coming from the guitar. A is going to fet booster into Dumble Style amp ,B goes to tuner and a Delay pedal ( 100%wet) into a 5 w Combo . Love it

added Presence knob on the far right?

I bought a VHT D-Boost recently, here is my review. Accurate take on the Fet Circuit of a Dumble. Uses a 2N4416A JFet and a LT1054 Voltage Converter. With a Power Supply of -12v I got 22v on top of the Drain Resistor (10k),16,5v at the Drain and 2,7 v at the Source. Lowering the Source Resistor from...

If my memory serves me well, the Fuchs ODS had 470p snubbers

I‘ve been doing this for some years now. Add a resistor between the speaker out and the reverb in( 50/100ohm in series) .This isolates the reverb from the amps output impedance. I‘m running 50 w amps at stage volume into the reverb pan feeding a small satellite amp( 5-10w) . Dry/Wet system

Build one yourself, it‘s only a pot and a resistor

Having 2 Jim Kellys, I can say ,it‘s not a problem with JJ‘s.One has 470v, the other about 460v on the plates.
High Plate Voltages are not so much problematic,High Screen Voltages can be.
These are great amps!

1M Trimmer with 150k to ground equals 100k trimmer with 40k to ground.Add the 220k ,there is a 7:1 ratio ( 280k:40k / 1070k:150k) so 12,5% Signal feeding OD 1

I have a schem of #094 with a 1M OD Trimmer, 152k to ground,100k pots

My Favorite !11years ago I built my first Dumble Clone,a silverface with the funky OD Entrance,that developed into a low plate Classic into a high Plate Skyliner into a high Plate Classic with a .05 mid cap into a 250k pot,150k Slope,mid boost and a 500k Bass Pot, my favorite Speaker is a JBL K120,L...