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Well, so I defeated the hum. The reason was, the backelite block #90 that is 2 Y-caps from both AC lines to the chassis was missing the GND connection. In its turn it was because the insulating base of the soldering post that unites an incoming AC wire with the transformer lead was over the GND lug and it should go under.
Fixed, no hum no more, especially when plugged directly to the wall outlet and not through an isolating transformer, for which a little hum remains, quite normal, all my radios do that.
Woo-hoo!
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Messages In This Thread
RE: Philco 16B restoration - by morzh - 11-11-2016, 09:04 PM
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Recent Posts
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Rogers Majestic R-646
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| Vlad;
I was just reminded of something else, I'm not sure why but many Rogers built sets do seem to have open primari...Arran — 04:40 PM |
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Rogers Majestic R-646
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| Thanks RpdB
I don't think there's much difference with interstage transformers of different models other than dimersion...Vlad95 — 03:27 PM |
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Rogers Majestic R-646
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| Vlad;
I looks like your set has the same problem that mine did, both a bad output transformer, and a bad audio inters...Arran — 03:21 PM |
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Rogers Majestic R-646
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| Ouch! Not often the secondary takes a hit. Wish there was a better solution. I have a good interstage transformer but it...RodB — 02:59 PM |
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Rogers Majestic R-646
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| By the way, the bypass you suggested is a rare solution in some circuits.
For example, this schematics solution is used...Vlad95 — 01:43 PM |
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Rogers Majestic R-646
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| No, you are wrong, because you did not know the details.
Unfortunately, only ONE winding out of six is intact in both t...Vlad95 — 01:14 PM |
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Rogers Majestic R-646
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| The output 45s are still in push-pull because the transformer secondary winding is still in the grid circuit providing o...RodB — 11:52 AM |
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Rogers Majestic R-646
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| Thanks RodB for the help.
But this is not a real solution to this situation, not even a temporary one. Because the firs...Vlad95 — 11:34 AM |
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Philco Model 16 wiring question
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I was going to check the voltages as you suggested and hooked it up to my dim bulb. It appears I have a short. The bul...bobclausen — 10:34 AM |
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Rogers Majestic R-646
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| You can bypass the interstage transformer by disconnecting the primary, connect a load resistor of about 10k - 20k to th...RodB — 09:40 AM |
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