12-21-2016, 01:47 AM
OK - so where did we leave off?
Right! Getting to the point where we can power it up on a variac for the first time and see if there are signs of life.
I like to do that before replacing too many components so that I can replace things in testable chunks (reduce the amount of wiring I need to check if I make a mistake).
Filter caps are a must to replace first though. Also that one resistor that measured open.
[Image: http://i1072.photobucket.com/albums/w374...0wpdzf.jpg]
I typically use a terminal board - in this case with a standoff - for the filter caps. I know a lot of you guys restuff them, which certainly looks nicer underneath, but I figure somebody (maybe me) will be replacing them someday. And since it's an easily reversible change (I mount using an existing hole) that's what I do.
Here we are with the open resistor and its siblings replaced as well:
[Image: http://i1072.photobucket.com/albums/w374...nltqc3.jpg]
Now it's time to put the tubes back in. All of the tubes that it came with tested good. Yay!
[Image: http://i1072.photobucket.com/albums/w374...idjyaz.jpg]
These look like these could be the original 24 tubes that this radio came with. It seems like there are still quite a few globe 24 tubes around (not so many 80 tubes - mine came with an ST version, so definitely replaced).
[Image: http://i1072.photobucket.com/albums/w374...xljs2q.jpg]
Slowly turning up the voltage....and....we have lift off at around 80V!
So that's great news - it receives a couple of the local strong stations and at pretty decent volume.
Right! Getting to the point where we can power it up on a variac for the first time and see if there are signs of life.
I like to do that before replacing too many components so that I can replace things in testable chunks (reduce the amount of wiring I need to check if I make a mistake).
Filter caps are a must to replace first though. Also that one resistor that measured open.
[Image: http://i1072.photobucket.com/albums/w374...0wpdzf.jpg]
I typically use a terminal board - in this case with a standoff - for the filter caps. I know a lot of you guys restuff them, which certainly looks nicer underneath, but I figure somebody (maybe me) will be replacing them someday. And since it's an easily reversible change (I mount using an existing hole) that's what I do.
Here we are with the open resistor and its siblings replaced as well:
[Image: http://i1072.photobucket.com/albums/w374...nltqc3.jpg]
Now it's time to put the tubes back in. All of the tubes that it came with tested good. Yay!
[Image: http://i1072.photobucket.com/albums/w374...idjyaz.jpg]
These look like these could be the original 24 tubes that this radio came with. It seems like there are still quite a few globe 24 tubes around (not so many 80 tubes - mine came with an ST version, so definitely replaced).
[Image: http://i1072.photobucket.com/albums/w374...xljs2q.jpg]
Slowly turning up the voltage....and....we have lift off at around 80V!
So that's great news - it receives a couple of the local strong stations and at pretty decent volume.