Quote:
Originally Posted by Radio Wrangler
Ah-ha!
It's changed from shunt to series feedback!
There's a resistor in series with those neons so they don't drive as much noise into the output!
The doesn't do what it says on the can tape loop has gone (and taken the input switch with it)
So he's experienced and had to fix most of the things to be found in the first version, or he's had some guidance.
Anyway, it's always nice to see that problems can be spotted ahead of them being discovered by those taking the long way round.
Asimov's positronics never turned up, so it's a shame we don't have complementary valves, they'd make things easier.
David
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Going by his notes, he seems to at least have some experience.
I think also that he has published this revision as a standalone unit over his other integrated studio amplifier which contained a phono amp and had the tape monitor added, etc.
If this revision is workable I may still go ahead with it, but I would be open to adding any other tweaks or improvements as seen fit to do so.
If i can shift away to another more suitable tube from the 12AT7, I may do that too if not too many mods are required.