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Jim , Re “It was not reported that a short circuit involved the common ground tap so I am not sure that this is of concern. “ maybe Halden understands you, but I don’t. I cant see any “short

HaldenIt was not reported that a short circuit involved the common ground tap so I am not sure that this is of concern.? When one 5 volt heater winding is at +800 RMS volts, the other is at -800 RMS

Hi Halden Your posting just poped up when there is no load on GIO. I also have contorted my head trying to get at the crux of this failure, and the reasoning behind it using other wording. Your

Hi Jim, Thanks for your explanation of the typical layering sequence on transformers for radio equipment of this era! I’m not sure I understand the part in bold where you say the 5V winding can see

Jim re The 5 volt windings see twice this for a total difference of 2.488 kV. Make sense? Yaaaaa! But we usually speak of rms in dealing with insulation, but the peaks are still there too. Sent:

Jim, I looked all over but cant find much on real construction for tube rectifier transformers. R e your construction—sounds good to me. If I was going to build one, I’d try that. That makes

Well, something went wrong!? See missing section in bold. Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

DonTransformers are usually wound with the highest V/A winding closest to the core and then the next and so on.? Once the primary is wound, the B++ winding is next, then the tap is brought out and

Jim, re “ …. This would put perhaps more then a KV difference between one 5 volt winding and the second HV winding sitting just below it ? I wonder where you get the voltages from . we can see on

Rick edited /fractured a bit Re Back to the original "Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY" subject of this thread, I think topics get started before they get properly thought

Well, an obvious way could be the same way a "flash-over"? in a tube rectifier kills the Collins 516F-2? transformer. Back to the original "Re: HT-37 transformer failure due to rapid

Rick and jim Re You are most likely correct, if the power transformer is still good after some 60 odd years, it may not fail, at least in that manner. How many ways do you think there are to smoke the

I used one of these for a sidetone oscillator for a SR 150. C$7.25 | DC 9-12V XR2206 Function Signal Generator DIY Kit Sine/Triangle/Square Output 1Hz -1MHz Signal Generator Adjustable module

Has anyone designed a sidetone oscillator for this pair? 73, K8AC

Can't say. I've never done a forensic analysis of one of these transformers.? The one in my HT32B (5V winding is taped off) has been that way ever since I got it.? It's still "shorted" to the HV

RickYou are most likely correct, if the power transformer is still good after some 60 odd years, it may not fail, at least in that manner.?? Are the two 5 volt windings side by side on the same top

I would venture to guess that if an HT32 or HT37 transformer has NOT

RickI'll keep my remarks centered on the HT-37 since that is the topic at hand. You said: "The voltage drop afforded with certain tube rectifiers is definitely a factor for low B+ voltage levels.?

Thanks Paul, I didn’t know what “PW Dahl-designed Hammond transformer” meant. Now I see ……… Peter W Dahl Transformers PWDAHL Series Magnetics for Amateur Radio Products This listing of

I have no proof of this but I think the original transformers were simply poorly constructed, meaning the original supplier (Stancor ,or other manufacturer of the time) just didn't do a very good job