I also have some queastions maybe someone knows?
I plan to etch boards by myself how large should i do the traces for the outputstage? at the moment i only have 35µm pcbs at home
Or should i look for 70µm boards?
And for the outputstage i want to use IRFP240 should be no problem.
But how should they be matched?
Is it ok:
->if the 6 from CCS fits togehther and the 6 from the Gain Stage also fits together?
or is it recommended that all 12 of one channel are matched togehther?
I`m not sure because in my Aleph J clone i used matched Quads so all Transistors of one channel are matched
I plan to etch boards by myself how large should i do the traces for the outputstage? at the moment i only have 35µm pcbs at home
Or should i look for 70µm boards?
And for the outputstage i want to use IRFP240 should be no problem.
But how should they be matched?
Is it ok:
->if the 6 from CCS fits togehther and the 6 from the Gain Stage also fits together?
or is it recommended that all 12 of one channel are matched togehther?
I`m not sure because in my Aleph J clone i used matched Quads so all Transistors of one channel are matched
Which is better left(smaller) or right(bigger)?
An externally hosted image should be here but it was not working when we last tested it.
The heatsink effect of the bigger washer is negligible - the reason for using fender washers is to make the screw pressure on the top of the transistor case as even as possible, so the transistors are very square and flat to the heatsink surface. That's where the heat transfer takes place - the metal side of the package.
Just started the psu, it measures +/- 36V with no load.
I will be firing up the amp tomorrow, any suggestion? It is not an F5, so not much to tune... Should i just measure dc offset and voltage across source resistors?
An externally hosted image should be here but it was not working when we last tested it.
I will be firing up the amp tomorrow, any suggestion? It is not an F5, so not much to tune... Should i just measure dc offset and voltage across source resistors?
Ok, started it, but :-(... I have: +/- 33.7V rail, DC on output -6.2V, voltage on source resistors(1ohm) -- 0.35V. R8(R11) source of Q3. --5.2V, R14(R18) -- 4.75V.
(BrianGT boards notation).
So everything looks perfect except DC offset. My Q1 and Q2 are matched perfectly, but I have a 100k R8(R6) resistor, maybe it is it?
(BrianGT boards notation).
So everything looks perfect except DC offset. My Q1 and Q2 are matched perfectly, but I have a 100k R8(R6) resistor, maybe it is it?
An externally hosted image should be here but it was not working when we last tested it.
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