05-14-2016, 12:46 PM
(This post was last modified: 05-14-2016, 12:52 PM by Roman Ships.)
Replaced all caps, added mid tone mod
Removed Hum Pot and replaced with two 100k resistors to ground
Added 1ohm R's from each cathode to ground with probe jacks
- added dual bias control
- moved R55
Dual Bias - Instead of altering R49, I built a second bias circuit and altered R35, R36 into a 75k + 50k trim pot.
I can't see any reason this wouldn't be an acceptable way of doing it. Am I correct?
I still get full B+ off all legs of c18, my assumption is that since I have no tubes in, there virtually no current and thus no voltage drop across those.
I put tubes back in and it popped the 6A Fuse. Not sure why that is yet.
Here are some pictures.
Rewired 1971 V4
More pictures
More Pictures
Removed Hum Pot and replaced with two 100k resistors to ground
Added 1ohm R's from each cathode to ground with probe jacks
- added dual bias control
- moved R55
Dual Bias - Instead of altering R49, I built a second bias circuit and altered R35, R36 into a 75k + 50k trim pot.
I can't see any reason this wouldn't be an acceptable way of doing it. Am I correct?
I still get full B+ off all legs of c18, my assumption is that since I have no tubes in, there virtually no current and thus no voltage drop across those.
I put tubes back in and it popped the 6A Fuse. Not sure why that is yet.
Here are some pictures.
More pictures
More Pictures