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In Reply to: RE: The great Will Vincent... posted by musetap on June 15, 2015 at 23:10:23
I can't argue with those results. It looks great! It looks like there was more that cosmetic mods done. I have never seen a Coke Bottle EL34, so I am guessing those are 2A3 DH triodes. They look a little to small for 300B's. What is he using for a driver?
Dave
Follow Ups:
~!
The Mind has No Firewall~ U.S. Army War College.
Don't know the technical aspects of that amp. I've owned a couple of his ST-70's that were standard rebuilds in that the original circuit design was employed, EL-34, GZ34,7199 tubes
used BUT with choice of ultralinear or triode modes. He put one of those cool meters for biasing on the last one (black one in pics).So, the green pic is one he sent me years ago as he explored different ways to build and rebuild various ST-70's. I never heard or had it. He sent me a pic once of his shop where he had many different colored amps done and ready to sell. LOTS of color!
I'd have bought one of his more colorful amps, but WAF was mighty low on that.
Will's even more particular about how they sound/operate than how they look too!
"Once this was all Black Plasma and Imagination"-Michael McClure
Edits: 06/16/15
Those all look like EL34's. There may be a coke bottle EL34. I am just not aware of it. I love the Stereo 70, but I share Eli's concern about the scarcity of 7199's. Of course there are a lot of solutions to this problem out there.
Dave
Couple years ago Will asked if I had some spares for him.
Luckily I did.
I'm sure he's tapped into more since; he has that talent!
I only used EL-34 amps from Will, but he did experiment with other configurations (such as that green amp).
Don't know if he still does, but he still makes HIS ST-70's.
"Once this was all Black Plasma and Imagination" -Michael McClure
Maybe the tubes are Sovtek 6B4Gs. "Uncle" Ned Carlson has a mod for Dyna ST70s that allows for alternate use of EL34 class multi-grid types and, specifically, Sovtek 6B4Gs. NOS 6B4Gs will not survive under the conditions found in a Dyna ST70.
Eli D.
Could be!
Dave
must have squeezed a couple of 2.5v fils trans in there somewhere and really tweaked the circuit. maybe a choke input filter to bring the B+ down?
!
The Mind has No Firewall~ U.S. Army War College.
A 5R4, instead of a 5AR4, will bring the B+ rail voltage down too. At the max. 250 mA. draw, the forward drop in a 5R4 is a whopping 67 V.
Eli D.
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