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Vintage threads from the first ten years

Trainwreck Rocket schematics?

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7/8/2000 1:49 AM
John Kelley Brown	Trainwreck Rocket schematics? I'm gathering information in preparation to build a Trainwreck Express clone and I've recieved a lot of helpfull information and schematics. This has me interested in seeing what's under the hood of a Trainwreck Rocket. Has anyone traced a schematic of one of these? John Kelley Brown

7/8/2000 2:33 AM
BWilliamson	Not that's been brought up here. Maybe behind our backs somebody got one--but they aren't saying!!! bw

7/9/2000 7:33 AM
Steve Ahola	BW: All I have heard is that they are supposed to be like an AC30 but with some well-placed tweaks. Right now I am more interested in information on the Liverpool amps... Steve Ahola

7/10/2000 3:37 AM
Frost	I was re-reading Ken Fisher's section in Gerald Weber's first book a few days ago and it said something along the lines that the express amp made from converting the Liverpool amp to fixed bias and using 2 EL-34s/2 6V6s instead of the Cathode biased 4 EL84s. However, I'm sure that he tweaked the circuit design somewhat for the express though. -Heiko

7/11/2000 1:24 AM
anonymous	The rocket is like an ac30tb channel with a bit from both the normal and treble versions. The biggest difference comes in the pwr supply. It's filtered almost the same as the Express. but it does have a tube rect and a choke. And it does use an 80uf cap for the first stage - that goes against all the books, but a DRZ amp does this also.

7/12/2000 5:15 PM
Joel	2 or 3 gain stages and other questions Anon, From what you are saying than, the preamp has two gain stages, a cathode follower, and then the tone stack, followed by the phase invertor? From pictures there is not a presence control so I assume there is no negative FB? Are the EL84's fixed or cathode biased?

7/12/2000 10:07 PM
BWilliamson	Just some info from books that don't really say anything. Pittman list the Liverpool rocket tube compliment as 3-7025, 4-el84, gz34. Funk's book(pg-100) list the preamp setup as a 1+1. First stage--tone stack--second stage out to driver. The express is a 1+2 for comparison. so the difference in information just confuses me more also. bw

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