01-07-2015, 10:53 PM
I hooked every thing up except the main amp B+ wire.
Powered up with variac to 115v. Every thing seemed fine.
I took voltage measure on dc reading. B5 , Q3( B to E .660v) (E to chassis ground .867v) ( C to grnd 12v)
B2,Q1( B to E .608v) ( E to grnd. 4.06v).
I turned off and hooked up B+ to main amp. powered up on variac at 50v was reading over 1 amp. problem still here.
I unhooked main amp and started rechecking volts as I removed each unit from power board. B2 control amp and B3 head amp unit seems to have a problem.
When either B2or,B3 are hooked up the volts on B2 and B3 drop to 14volts from 38v. I'm measureing at the posts on power board. B2 andB3 are also reading the same 38v or 14v B2 is supposed to be 40v and B3 25v.
I hope I explained this clearly enough.
Wondering if I will have to rebuild head amp and control amp. I don't want to get ahead of problem by guessing.
Powered up with variac to 115v. Every thing seemed fine.
I took voltage measure on dc reading. B5 , Q3( B to E .660v) (E to chassis ground .867v) ( C to grnd 12v)
B2,Q1( B to E .608v) ( E to grnd. 4.06v).
I turned off and hooked up B+ to main amp. powered up on variac at 50v was reading over 1 amp. problem still here.
I unhooked main amp and started rechecking volts as I removed each unit from power board. B2 control amp and B3 head amp unit seems to have a problem.
When either B2or,B3 are hooked up the volts on B2 and B3 drop to 14volts from 38v. I'm measureing at the posts on power board. B2 andB3 are also reading the same 38v or 14v B2 is supposed to be 40v and B3 25v.
I hope I explained this clearly enough.
Wondering if I will have to rebuild head amp and control amp. I don't want to get ahead of problem by guessing.