New project RCA 28T - Printable Version
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+--- Thread: New project RCA 28T (/showthread.php?tid=19791)
New project RCA 28T - OZ4 - 03-26-2019
Do these cough drop looking caps have any reputation for being bad or good?
RE: New project RCA 28T - OZ4 - 03-26-2019
And I found a little surprise.
The pictures are out of order. I still can't get it right.
RE: New project RCA 28T - Jake Blake - 03-26-2019
UFO
RE: New project RCA 28T - Ron Ramirez - 03-26-2019
Since this thread is about an RCA radio, it has been moved to Other Radios (Non-Philco).
And to answer your question about the mica cap - The "cough drop" mica caps can and do go bad. They are often cracked open, or swelled up and about to crack open. Replacement is the cure.
I had some bad mica caps in my RCA 6T2, and I just replaced all of them as it did not have that many.
RE: New project RCA 28T - Paul Philco322 - 03-26-2019
I have a 28X5 look similar, different dial.
Good luck.
Paul
RE: New project RCA 28T - mikethedruid - 03-26-2019
I have an 18T which I restored. It is very similar to yours, just a few years older, just before WW2. check the schematics, they are practically the same. They even look like siblings.
[Image: https://66.media.tumblr.com/6e0bef924c08fb8bc2614e5421bb5e0f/tumblr_pixpl7sEqX1s2snqvo1_500.jpg]
RE: New project RCA 28T - Radioroslyn - 03-26-2019
+1 Ron.
Some of those mica caps are dependent on the casing to keep the capacitance @ a fixed value. If it's cracked I'd replace it.
I fixed up an 18T a while back. https://www.flickr.com/photos/42774321@N08/4508825569/ The spkr isn't so hot but set plays well.
I don't think the 18T has a bias cell. Did have rubber wire best I remember.
GL
RE: New project RCA 28T - mikethedruid - 03-26-2019
Yes, the 18T is filled with rubber wiring, and is a real pain in the a** to redo since a lot of it is tight in and something of a rats nest. You have my sympathy if the 28T is the same.