loud hum

[Paul Birkeland]

What voltage do you see at terminal 22?

[bucketofguts]

97.6V

Power on
Valves in

Thank you. You are a gentleman and a scholar.

[Paul Birkeland]

Can you perform the AC voltage checks for the power transformer again?

I would also suggest reheating and adding some solder to all the solder joints with UF4007 diodes, especially if the transformer AC voltage checks are correct (which I suspect they are).

[bucketofguts]

Thank you. Will do.

is there a resistance value across those diodes that I should be looking for? Could one or both be faulty? (I see four)
 
Where are the ac terminals on the transformer?  help.....

[Paul Birkeland]

Page 29 in the manual provides the test for the power transformer.

When diodes like those fail, they tend to explode, so I don't believe that's worth looking at just yet.

[bucketofguts]

I measured 6.24 V AC as shown on page 29. (I have the exact same multi meter)

[Paul Birkeland]

How about for the high voltage winding?

[bucketofguts]

174.9

[Paul Birkeland]

What's the DC voltage between 20 and 21?

[bucketofguts]

Thank you ! That will have to wait. It is not my fault.


b~

[bucketofguts]

97.5 on both. thank you!

b~

[Paul Birkeland]

Terminal 20 is grounded.  If terminal 20 has 97.5V on it, it's not grounded, and one of your black wires is loose (there are only two black wires between this terminal and terminal 12).

[bucketofguts]

I will replace both with new wire, test and get back. Thank you kind sir. Lots to do today, out the door "in the rain". Will post as soon as I can. Probably this evening EST.

b ~

[Paul Birkeland]

The wires are probably OK; it's more likely to be a solder joint issue.

[bucketofguts]

 (there are only two black wires between this terminal and terminal 12). I know that sounds easy but what two black wires. I have sucked, chem-wik, and soldered and still no joy. I am sorry to have ask.

b~