[Heathkit] HP23A trouble

[Dick KF4NS]

I recently replaced the diodes with 1N4007's and all was 
fine......until yesterday. I fired it up with no load to record the 
voltages and heard a loud pop. The breaker was tripped so far that it 
reversed the spring contacts so would not reset. I opened it up and 
popped the contacts back to the opposite position and tried again. I 
did the usual visual inspection and the "initial tests" before trying 
again. It tripped again so did my diagnostics and found all the new 
diodes shorted.

I realize that 1N4007's are rated at 1000V PRV but only at 1A. The 
breaker is rated at 2.92A. Is there a preferred sub for the original 
Heathkit diodes? The 125mfd caps are testing ok except C3 at 159mfd 
and C4 is 115mfd. None are shorted.

Have not tested the xfmr yet (I need some bravery liquid before I do 
that, hi,hi). The breaker will be replaced with a slo-blow 3A ceramic 
fuse and should be ok along with an ICL in the power lead.

By the way, anybody have 4 100K 2W to sell me? The existing 10pct.ones 
are all out of tolerance.

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!