Latest Creation!

Guitar geeks might be interested in this. Finally finished my first all valve amp. It’s basically a 70s Marshall 2204 JMP Master Volume (which then became the original JCM800 in the early 80s) with a couple of tweaks to the tone stack and a power amp direct in so I can use my JMP1 pre amp with it if i ever desire to.

The wooden box was made from an old door that was kicking about my dads garage. Not sure if i’m going to leave it pure wood or paint it/tolex it. I’ll have to see. The mains transformer is a weird one and seems to be giving pretty high B+ and heater voltages on its output (about 7.2V rather than 6.3). From what I can tell, it warms the tubes up alot more than usual, which means more electrons will be dissipated from the cathode which will either mean earlier saturation or MORE VOLUME! It will mean a shorter tube life, but I think I can live with it.

Can’t really do a thorough test as my neighbors and house mates are sleeping but watch this space for sound clips..

In a bit..

M

wires!
Done!Top Down

33 Responses to “Latest Creation!”

  1. Brilliant Max! I’ve not yet had the courage to build a valve amp…. But it’ll happen at some point! Do you generally just use the valves like normal transistors in their bias etc? What kind of rail voltages do you use?

  2. Looks great (and loud) Max! Well impressed. I can’t really comment on electronics, but blue indicator lights are so much cooler than red ones. See you at atp!

  3. Tom: B+ line is about 500V, the biasing is very similar, just give enough quiescent current to stop cross over distortion. Same principle.

    Andy: Blue is best - see you in a couple of weeks

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