Trainwreck Songbird 30

[M Fowler]

Voltages

[RJ Guitars]

Mark, did you ever get this to sound good for you?

I just finished mine (Pedal Mule) and it is simply amazing... maybe not for everybody but I think everybody would say it sounds amazingly good. I did find a couple tweaks and I also used a Heyboer Dynaco 470 output tranny.

Just curious, I think this should be a good sounding amp.

FWIW - I tried every way in the world to hook up the NFB (more resistance - less resistance - other taps - etc..), it always sounded horrible. Otherwise the schematic was pretty similar in my build. Without it, it has great clean shimmering highs with a really full fat clean tone. If you push it hard you can make it break up but it's really cranking some sound at that point.

[M Fowler]

No I worked on this thing until I got tired of it and shelved it again.

I haven't worked on an amp in a 2 or 3 weeks, no energy to get much done.

Watching grand kids and family problems, plus preparing for my daughter's wedding in June. '

For a retired guy I'm busy.

[RJ Guitars]

Sounds like important stuff... enjoy your family while you've got them there with you. You can join us after you tend to the things that matter.

[dorrisant]

Send it to me, Mark! Ha, ha!!

Tony

[M Fowler]

So what is the correct cap and resistor values for the preamp of the Songwriter?

Which schematic shows the correct values?

Mark

[splgeo]

in the schematic it looks like c8 would be sending all of the signal from that side to ground

[Mark]

Looking at the negative feedback you wouldn't think 200K from the 16ohm tap wouldn't have a huge effect. I suppose you could try the 4 ohm tap or put a pot in series with the feedback resistor?

You should find a sweet spot. I wonder if any of the later Rockets might have been built with negative feedback?

https://m.youtube.com/watch?v=3sxgE1ocYTM