As mentioned in another thread I put this Dynaco 400 amp together about 30 years ago. I've recently replaced some bad transistors and resistors (and old electrolytic caps, Nigel
). A site I found
**broken link removed**
indicates that I now need to check/set bias current and input offset voltage.
In doing these repairs I found that a previous professional repair had replaced R32 on this schematic
https://i213.photobucket.com/albums/cc93/tharba/dynpc-28.jpg
with a significantly different value. Stock was 750 ohms, in there now is 7500. Both L and R boards are done this way--and the amp seems to have worked fine for years since that was done.
My question is, will that 7500 ohm resistor change mean I need to set the bias current, or input offset voltage, to a different value than specified?
Thanks.
**broken link removed**
indicates that I now need to check/set bias current and input offset voltage.
In doing these repairs I found that a previous professional repair had replaced R32 on this schematic
https://i213.photobucket.com/albums/cc93/tharba/dynpc-28.jpg
with a significantly different value. Stock was 750 ohms, in there now is 7500. Both L and R boards are done this way--and the amp seems to have worked fine for years since that was done.
My question is, will that 7500 ohm resistor change mean I need to set the bias current, or input offset voltage, to a different value than specified?
Thanks.