Swart Atomic Space Tone guitar amp

[CJ]

flooded out amp, king tide plus full moon,

opt rewind,

 

[CJ]

6V6 push pull,

board had to be cleaned,

 

[CJ]

schematic,

fender ideas, early princeton tone/vol, no f/b, transformerless reverb,

vibrato like princetone reverb, cathode bias,

opt is EI 87 (0.875 tongue sq stk) , coil pri- sec, about 4000 t #34 and 125 t #20,

 

[kags]

Fantastic Amp!

 

[fazer]

Thanks CJ. I’ve wanted to know more about this thing for a while. Great job buddy.

 

[rock soderstrom]

transformerless reverb

What type of pan is in this amp? A half 12AX7 without transformer is not the best driver for a spring reverb...thanks for the schematic

 

[CJ]

customer has the cabinet at home, i will ask him,

they do the same thing on their champ with reverb and it sounds killer, slightly different circuit,

 

[rock soderstrom]

customer has the cabinet at home, i will ask him,

thanks!

they do the same thing on their champ with reverb and it sounds killer, slightly different circuit,

yep, sounds good. The reverb is way bigger than it looks in the schematic. Kind of constant current drive circuit plus a high impedance tank???

 

[CJ]

Ampeg used the transformerless reverb also,

Swart Champ inputs the signal into both grids of 12ax stage one then uses one tube for preamp, one tube off to reverb circuit,

 

[fazer]

I thought they used a 12dw7 for the verb in the atomic

 

[fazer]

Do you know CJ what the B+ voltage to the CT of the output trans is by chance.?

 

[CJ]

i get 350 AC 485 after 5Y3 unloaded

i will check on dw7 could be, customer has tubes,

 

[CJ]

got this thing running, took down volts, AC on red,

 

[rock soderstrom]

got this thing running, took down volts, AC on red,

Thanks a lot!

i will check on dw7 could be, customer has tubes

Spring reverb is realized with a 12DW7, I had the chance to see the JJ tube in person. Sounds good.