First Post-Restoration Glitch

[rcaman]

why on earth would you leave a black beauty in the set when you are using it for a daily watcher. doesnt make sence to me. it would be fruitless to make any checks untill you get that bad black beauty out of there. steve

[compucat]

Originally Posted by rcaman

why on earth would you leave a black beauty in the set when you are using it for a daily watcher. doesnt make sence to me. it would be fruitless to make any checks untill you get that bad black beauty out of there. steve

I only left it in because I did not have a replacement and I've never had a set that used these before. It was not a wax paper cap so I left it alone. Most of the stuff I work on is from the Forties and I always replace the paper caps. I thought this set was new enough that it would not be a problem.

I am going to order a replacement from Just Radios so I will not have to wonder about it. I can't wait to get into the set and find out what went wrong. I sincerely hope it is not the vertical output transformer.

[wa2ise]

Originally Posted by compucat

I only left it in because I did not have a replacement and I've never had a set that used these before. It was not a wax paper cap so I left it alone.

It is a wax paper cap encased in a plastic shroud. Guarenteed to be bad now.

As a quick test, use a few caps in series to get the cap rated at 0.015 uf, 1000V. The formula for ding series caps is C= 1/((1/c1)+(1/c2)+(1/c3)+etc), similar to parallel resistors. Best to use caps narly the same capacitence, so the voltage drop across them is close to even. The smaller cap will see higher voltage. A pair of 0.03 caps, or 3 0.047 caps would do it.