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Trainwreck amps


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4/12/2000 9:55 PM
nathan Trainwreck amps
Any one ever build or have a full schematic of a trainwreck express amp? these amps are very interesting...  
 
thanks  
 
Nathan
 
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4/13/2000 12:03 AM
John Stokes
I think there's a schematic on Steve Aloha's page.
 
4/13/2000 2:36 PM
peter
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.  
 
YMMV,  
peter
 
4/13/2000 3:21 PM
nathan
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?  
 
Thanks,  
Nathan
 
4/13/2000 4:43 PM
peter
Hi,  
 
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  
circuit.  
 
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.  
 
peter
 
4/13/2000 11:31 PM
DavidB

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!  
 
 
db
 
4/14/2000 12:02 AM
anonymous
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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