Tube Amps / Music Electronics
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|4/12/2000 9:55 PM|
Any one ever build or have a full schematic of a trainwreck express amp? these amps are very interesting...
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|4/13/2000 12:03 AM|
I think there's a schematic on Steve Aloha's page.
|4/13/2000 2:36 PM|
besides the schematic there is also some
discussion of (1) corrections, and (2)
modifications. I built one and found it
had an interesting and different sound,
but was far too trebly for my taste.
Much of the discussion of modifications
involved taming the high end. Easy
enough to reduce the treble, but then it
loses the unique character that it had.
Still haven't got mine to a state that
I'm happy with.
|4/13/2000 3:21 PM|
What types of tubes did Ken Fischer use for his amps? Where did you find the power amp schems? Did you model the power section after another amp?
|4/13/2000 4:43 PM|
I don't know what kind of tubes.
The schematic I have includes both preamp
and power amp. The power amp is nothing
unusual, typical marshall/fender type of
The preamp has one stage before
the tone controls and two after, so the distortion
comes AFTER the tone control, unlike e.g. a marshall.
Between stages 2 and 3 there is a 0.001 uF cap
loaded by a 56k resistor, forming a high-pass filter. Those 2 components have a profound effect on the character of the amp.
|4/13/2000 11:31 PM|
I think for the Express siemen 34's where the stock valve.I'd like to get a look at the 84 powered Rocket as I hear it's a lil killer!
|4/14/2000 12:02 AM|
Peter - the correct values between the 2nd and 3rd stage are 2n/150k. Also the 2n is made up of 1n film and 1n ceramic. Try it out
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