Ok...the next project I'm mulling in my pointy head is an SE amp using EL34 or KT88 outputs and a very simple circut. Anyone have any ideas and/or schematics/plans ? Since my area of interest is mainly musical instrument amplifiers, it would ideally be something designed for or easily adapted for that purpose. I am relative novice-level having rebuilt/overhauled a couple dozen amps and scratch built...with a lot of help from this forum..one screamin' banshee of a mutant Fender circut. I like cathode bias amps for their touch sensitivity...also I would like to easily swap tubes with other compatable types...i.e. KT90, KT100...I appreciate all your suggestions...I have a file full of those so far. 
About the most straightforward SE amp design you can write
down is described here:
http://diyaudioprojects.com/Tubes/KT88/
A nice discussion of various modifications can be found here:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=129647
If you make the cathode bias at least partly adjustable, you can handle
almost any output tube in the 6L6/KT66/KT88 family.
down is described here:
http://diyaudioprojects.com/Tubes/KT88/
A nice discussion of various modifications can be found here:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=129647
If you make the cathode bias at least partly adjustable, you can handle
almost any output tube in the 6L6/KT66/KT88 family.
Re: Russ..re Simple SE
Yes, it's a PCB amp. You could build one PtP, of course. The schematic and everything is there, but you said simple, so...
Alex's KT88 SE amp on diyaudioproject.com is the one I was planning to build before coming across the SSE. It's a bit simpler than the SSE to boot.
bereanbill said:That's a PCB amp ? I'd prefer PP ...can I get a schematic and build it from scratch ? Would that be easily adapted to instrument amplifier...i.e. 1 meg input?
Yes, it's a PCB amp. You could build one PtP, of course. The schematic and everything is there, but you said simple, so...
Alex's KT88 SE amp on diyaudioproject.com is the one I was planning to build before coming across the SSE. It's a bit simpler than the SSE to boot.
I built this one. Very nice sounding.
http://db.audioasylum.com/cgi/m.mpl?forum=tubediy&n=130609&highlight=proud+papa
http://db.audioasylum.com/cgi/m.mpl?forum=tubediy&n=130609&highlight=proud+papa
It sounds like you are looking for a high powered Fender Princeton clone. Try this schematic and instead of the 6V6 use a EL34. Allen Amplifiers has transformer (TO11C) that is perfect for a SE EL34 output. You can find it here:
http://www.allenamps.com/parts.php#transformers
If you want more gain then I would use a additional 6SL7 gain stage and wire it up as a pre and post gain. That will give you all the "crunch" that you want. I had a schematic drawn up for such a beast but I can't seem to find it. I'll keep looking though. You will need to boost the voltage for the output stage also.
http://www.allenamps.com/parts.php#transformers
If you want more gain then I would use a additional 6SL7 gain stage and wire it up as a pre and post gain. That will give you all the "crunch" that you want. I had a schematic drawn up for such a beast but I can't seem to find it. I'll keep looking though. You will need to boost the voltage for the output stage also.
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