Model 650 Tone Control Question
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Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Hi Hamilton, The values for primary impedance I got from my docs are higher than those quoted by Dale and Ron, but go with them. [Correction, 07/11/23- By "them", I mean Ron R and Dale, not the specs that I posted from the RCA and Tung Sol documents. Sorry for any confusion.] My info was from the RCA Receiving Tube Manual, but possibly at a different voltage. Ron and Dale are Philco Experts and have the documents to prove it (Speaker P/Ns, Specs, etc.). However, anything mildly close will be better than the open one that you have.
The one thing that you may want to try to do is to peel back the paper. In your pic, there seems to be a burn mark. I expect that connection#3 is the open one and the burn is under #4, but it also seems that the wires cris-cross under the paper. You may get lucky. However, a new transformer is better than an 87 year old one.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
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RE: Model 650 Tone Control Question - by MrFixr55 - 07-10-2023, 04:39 PM
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