Hi,
I was looking the PP1 design at Schematics and I've also read about and found scematics for a newer KT88 based revision called PP-2C
I've seen threads here from people who were contemplating to build one of those but I have not found any actual stories of completed builds so far.
Did anyone here or someone you know build one of these and would be willing to share some expiriences, stories or pictures? That would be very interesting...
Cheers!
Lars
I was looking the PP1 design at Schematics and I've also read about and found scematics for a newer KT88 based revision called PP-2C
I've seen threads here from people who were contemplating to build one of those but I have not found any actual stories of completed builds so far.
Did anyone here or someone you know build one of these and would be willing to share some expiriences, stories or pictures? That would be very interesting...
Cheers!
Lars
This thread has been referenced before. It may help you. I am not affiliated with the thread, just had it bookmarked, and have not built this amp myself.
Matt
Allen Wright's - PP-2C eindversterker - forum.zelfbouwaudio.nl
Matt
Allen Wright's - PP-2C eindversterker - forum.zelfbouwaudio.nl
Thanks! That's a load of information there and google translate does a decent job on the dutch language.
I wonder why he didn't go with the original SuperReg as a shunt regulator.
I've been using series regulation in my projects so far but I know that Allen (shame on me for misspelling his first name in the thread title) was a big proponent of shunt regulation - I've never had the chance to compare both concepts side-by-side though
I wonder why he didn't go with the original SuperReg as a shunt regulator.
I've been using series regulation in my projects so far but I know that Allen (shame on me for misspelling his first name in the thread title) was a big proponent of shunt regulation - I've never had the chance to compare both concepts side-by-side though
It's to all intents and purposes a Hedge cascode LTP with an ST70 OP stage, ish. I have an article of an ST70 modification using Hedges cascode LTP, keep meaning to build one, at least on the bench. See attached. From what I've read they perform well.
Andy.
Andy.
I terms of power-supply/regulation, I've had good results with the attached scheme for a KT88 PP build (480V B+, 300V for the grids and 360 for 90V/270V on ECC83 driver)
The PP-2c uses a big fat choke for the plate voltage and a shunt regulator... how necessary is that? Does that design have a clear advantage? I could re-use and adapt my existing design for the 450V/380V of the PP-2c but would it work as good as the original?
I still need to learn a lot abou power supplies so apologies in advance if this is obvious...
The PP-2c uses a big fat choke for the plate voltage and a shunt regulator... how necessary is that? Does that design have a clear advantage? I could re-use and adapt my existing design for the 450V/380V of the PP-2c but would it work as good as the original?
I still need to learn a lot abou power supplies so apologies in advance if this is obvious...