Recently cobbled a 2E22 se A2 amp (g1+g2 driven) - excellent results. On a whim I substituted PT15's - now like many, I've used PT15's in class A with good results but not A2.
Taking care not to overrun g1, results are comparable to the 2E22. Also careful to connect g3 to filament mid point or can oscillate if connected to anode.
Anyone else tried this with PT15?
atb
David
PT15 se A2 operation
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Mike H
- Amstrad Tower of Power
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#2 Re: PT15 se A2 operation
Hello David, long time no see! 
Any chance of a schematic? Struggling to get my head around it.
Any chance of a schematic? Struggling to get my head around it.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#3 Re: PT15 se A2 operation
Hello Mike
It is a long time Tonbridge I think.....Danbury was a loss, still have transformers working!
I'll do a sketch (sorry no cgi here!)
It's basically just the usual A2 format but using +ve drive to g1 + g2 strapped - works with most transmitter pentodes to varying degrees.
Nothing new or special.....
atb
David
It is a long time Tonbridge I think.....Danbury was a loss, still have transformers working!
I'll do a sketch (sorry no cgi here!)
It's basically just the usual A2 format but using +ve drive to g1 + g2 strapped - works with most transmitter pentodes to varying degrees.
Nothing new or special.....
atb
David
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Paul Barker
- Social Sevices have been notified
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#4 Re: PT15 se A2 operation
Where did I put those PT15’s?
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
#5 Re: PT15 se A2 operation
Sketch of cct - told you it wasn't anything special!
Valves are 6SJ7 6Y6 PT15
Valves are 6SJ7 6Y6 PT15
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