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In Reply to: RE: 813 set schematic posted by vinnie2 on February 10, 2019 at 09:12:26
Can't drive a power triode with anything but a 12AX7, running less than .7 mA idle current. Direct coupled of course. Anything else is not going to work. AC heaters too...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Follow Ups:
12AX7 has now been replaced by a 12BZ7 for budget SE DC 2A3 builders.
sez who? I have not seen a post about it. last I heard was the high plate resistance, low current, high gain was the Only Way.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Link posted.
Be enlightened by the master of SE DC 2A3's.
At the rate he's going it may be that we will see the 6H30Pi driver running comparable idle current to his 2A3...LOL
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
DF is still using the 7B4 driver for his SS 2A3 amps, I doubt that will ever change.
His departed friend is actually working on a PP design - of course the details are forbidden to be released to those outside an elite circle of contacts.
PP can't possibly work. I read it here. It has to be so.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
I have built one previously with these very tubes and it worked fine. Problem is I lost the bloomin' schematic!
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