07-23-2011, 05:54 PM
A few thoughts...
1. Using a metal 6SA7, right? 6SA7GT glass may not work.
2. Any chassis ground connections made via rivets? Might dab them up with solder.
3. How did you test C23-68pf? If in doubt, replace it.
4. You mentioned cleaning the bandswitch wafers...are they now 'waterlogged' or anything like that? Some cleaners will soak into the wafers causing leakage.
5. Although the schematic doesn't show a trimmer on the tuning cap oscillator section, is there one? If so, clean it up and make sure its not shorting. For that matter, confirm that the oscillator section of the tuning cap is not shorted somehow.
Just guessing
Good luck.
-Bill
1. Using a metal 6SA7, right? 6SA7GT glass may not work.
2. Any chassis ground connections made via rivets? Might dab them up with solder.
3. How did you test C23-68pf? If in doubt, replace it.
4. You mentioned cleaning the bandswitch wafers...are they now 'waterlogged' or anything like that? Some cleaners will soak into the wafers causing leakage.
5. Although the schematic doesn't show a trimmer on the tuning cap oscillator section, is there one? If so, clean it up and make sure its not shorting. For that matter, confirm that the oscillator section of the tuning cap is not shorted somehow.
Just guessing
Good luck.-Bill
