Had it working many years ago.
As far as I can tell ,the problem is int he detector stage.
With an audio generator I've confirmed the audio portion is working.
All tubes are good and I've swapped with others.
The schematic calls for a 2 - 4 meg grid leak resistor
The installed 5 meg measures at 6
I did try a 2 meg but no difference
Any ideas?
Right now I'm stumped
On 8/9/19 2:23 PM, philo wrote:
Had it working many years ago.
As far as I can tell ,the problem is int he detector stage.
With an audio generator I've confirmed the audio portion is working.
All tubes are good and I've swapped with others.
The schematic calls for a 2 - 4 meg grid leak resistor
The installed 5 meg measures at 6
I did try a 2 meg but no difference
Any ideas?
Right now I'm stumped
Detector OK
I should have figured this out sooner.
Though there was audio output when I connected my audio signal generator, it was very low level
Problem is the first inter-stage transformer.
I replaced the other one 25 years ago
Got one from AES designed to go inside the original "can"
It was kind of a PITA removing the guts from the original tar seal
Detector OK
I should have figured this out sooner.
Though there was audio output when I connected my audio signal
generator, it was very low level
Problem is the first inter-stage transformer.
I replaced the other one 25 years ago
Got one from AES designed to go inside the original "can"
It was kind of a PITA removing the guts from the original tar seal
pardon?
I am glad that there are still some individual that are doing these sorts of repairs, and apparently enjoying it!shutterdial, the newest, a 1963 Japanese 5-tube clock-radio.
A few weeks ago, I was part of repair clinic at the Museum of Industrial History in Bethlehem, PA - and the three of us involved were busy from the moment the doors opened, to the end of the event. The oldest radio I "touched" was a Zenith 11-tube
Congratulations!
On the "tar" thing. Most of the time, if you freeze the original can, the whole shebang will just pop out with a sharp rap.
Peter Wieck
Melrose Park, PA
I just finished restoring the guts of a 1925 RCA Radiola 24. That set has the 6 tube catacomb circuit where the entire circuit is in a can full of pine rosin.shoved it all into the small toaster oven at 350 degrees. 3 hours later the pine rosin was like water (except for the smoke and the smell) and I was able to get to all the broken wires and a bad rf coil in the catacomb. A really tough repair at my age
The tests I ran showed several bad connections so I had no choice but to melt out all the pine rosin. I got a cheap small controllable toaster oven at a thrift store. I put the entire catacomb into a flexible 99 cent aluminum turkey roaster pan and
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