Thanks Igor.Igor said:220pf 5% were supplied in baggies, IIRC.
These caps can be in 180pf - 220pf range but should have close (5% is ok) values.
As well, a parallel trick with 2x100 pf styrenes should work fine.
kante1603 said:Anyway,did anybody of you ever solve this issue and could post a bit about it?
Hi all,Igor said:
For use with input IC amp, INSTALL R11' = 560k.
This resistor IS installed on "my" or "original" input amp PCB.
BD139 shouldn't be a problem. Check all other things, maybe, wrong value resistor or put 2484 instead of 4250, etc.gunpoint recording said:kante1603 said:Anyway,did anybody of you ever solve this issue and could post a bit about it?
I never did get 1 of my 2 igor input amps working. i tried swapping w/ 2 new bd139s TWICE, w/ no luck. so i was in the assumption it could possibly be one of the other transistors. I plan to get back to it but haven't gotten to it yet. However, i am using a pair of the f76 and love them. using an IC input amp and gar2520s on the outputs. rev F style otherwise.
Cool,Igor said:560k is resistor which pulling the input of first amplifier to ground or to its bias.
With IJ amp, no need for 560k, because it has own bias circuitry at its input already.
That would mean that quite a few guys here have similar problems,right?Igor said:BD139 shouldn't be a problem. Check all other things, maybe, wrong value resistor or put 2484 instead of 4250, etc.
kante1603 said:Hi all,
Me again.
I'm using LL1524 as output transformer.
Can somebody please tell me the correct values for the zobel network meaning R101 and C100?
I have 1k (R84) as load as stated on the bom and schematics.
Thank you in advance,
Udo.
kante1603 said:Thank you very much chunger,
have read that in this thread,but I am a bit confused because it says 469r here and 460r in another place.May I ask how you ended up in these values?
Tried a search for zobel network,seems quite complicated.
Best,
Udo.![]()
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