37-60 Started repair again
Posts: 1,136
Threads: 11
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Varistors are useful on units with solid state rectifiers and high value caps to limit inrush current. Common to add these to such units like the Fisher 400, 500 and 800 series Hi-Fis from the late 1950s to early 1960s.
Only issue that I have with using a matching transformer as opposed to a standard audio output transformer is that the 70V matching transformers are not designed for a DC component. If you really try to use one, use a 70V primary. I don't think that you are gonna get the turns ratio and current capacity needed from a 25V Unit, but I defer to Ron Ramirez as he has actually done it.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
Messages In This Thread
RE: 37-60 Started repair again - by MrFixr55 - 05-20-2023, 12:31 PM
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Recent Posts
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An attempt to remove the Field Coil from a G speaker
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| Mike;
I've only run into a speaker with an open filed coil twice, and they were on newer speakers from the 1940s. One ...Arran — 12:48 AM |
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An attempt to remove the Field Coil from a G speaker
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| Arran
Yes, this is my plan for now and what do I got to lose, this is not even the speaker from this radio, but one o...morzh — 10:44 PM |
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An attempt to remove the Field Coil from a G speaker
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| Mike;
I would unwrap the field coil, and see if maybe there a break near one of the ends, like where the coil wire att...Arran — 10:23 PM |
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An attempt to remove the Field Coil from a G speaker
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| ...and this is what I did. I fed a little LT into the screwholes with a small brush, and a little on the rim next to the...morzh — 09:52 PM |
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Philco 40-120C Restoration
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| Just checked were I buy tubes price is four dollars. So living in Florid we have a local source for tubes. David David — 09:14 PM |
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Philco 40-120C Weak, Distorted Ouput
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| The higher voltage may be due to higher mains voltage. My mains run 120-125AC when the set was new mains would be 110-11...David — 09:09 PM |
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Philco 40-120C Weak, Distorted Ouput
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| Thank you for your reply. I pulled a speaker from a Philco 41-221 and received the same result. I used a signal tracer t...bluecap — 08:45 PM |
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Philco 40-120C Weak, Distorted Ouput
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| Have you tried a different speaker?
How did you trace the distortion?
How do you know it is weak? What is the reference?...morzh — 08:33 PM |
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