Would there be any interest in
 

a complete rebuild and modding of some big tube amps in here? I'm thinking about doing a set of Allen 75s pretty soon, from stem to stern. I was just thinking this might be a nice little quiet spot if one or two guys wanted to follow along and or make suggestions. Any interest at all?

I'd be on board for that :)

RC

I would watch in ignorance, maybe learn something :)

Pete

I know your kind. You probobly only use solid state gear. :cool:








(like me :p)

I think I could go for it.

Dave

That would be a first, huh Pete? :)

What tubes do they run?

You know I'm ready to follow along and build mine with ya.

You check out that other spot I linked ya to that might be better suited?

KT-88/6550's

Stock they use a 12AY7 into an EF86, a couple 6SN7s and KT88s for outputs. To me, that's too much gain up front, so I eliminate the crappy 12AY7 and run the signal straight into the low noise pentode EF86 (6267 US number). I think the two I'm getting are all Acro iron from stem to stern, so they should be good amps if built right. They are rated at 70 watts, which is a bit of a stretch for a pair of 88s. I have a pair of mono Stromberg Carlsons (AP50s) that are rated at 50 watts running 4 6L6s per amp. I'll probably do those after the Allens. Here's a thread about them from DIY. Hope you don't mind Ron, you sold these didn't you?

http://www.diyaudio.com/forums/swap-...-restored.html

Cool. All the tubes you listed are absent from my hoard though.
Maybe down the road we could build a monster useing 6LQ6's, 6LR6's, or some other sweep(?).

I have a few of those. :)

My last project was a sweep tube amp. Used the compactron 6JM6 or you can use the 6JN6 if you don't want plate caps. I basically ripped off David Berning's screen drive, but put a massive power supply of my own design in it. I think David would have used a bigger supply if he only built one too. The outputs idle at ~3ma, so you can actually lay your finger on the side of the output tubes. That's why the big power supply ( about 3000uf at 500v), it has to have the electrons very handy to go from zero to 60 in a nano second.:D The 6LR6 seems interesting. http://www.duncanamps.com/tdsl/show.php?des=6LR6

You'd probably want regulated screens though, which is no big deal if you don't mind a little sand.

You are way above my level of knowledge with this stuff.
I play with "Black Market" sweep tube RF amps. I'm getting out of them and have deceided to build a huge graphite tubed beast.
Now I will have no use for all of these sweeps. I've always been intrigued by those 6LQ6 powered Mac's built in 68-70 or so.

I've got some 4E27s I need to build something with. 75 watt plate dissapation, I'm thinking SEP, with maybe an EL34 driver.
http://www.tubecollector.org/4e27.htm