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Good stuff, Walt.? The articles you posted on your site are helpful. Thank you. -- 73, Russ KW6T The cheap item is rarely the least expensive.

Don. The bleeders are the likely culprit, and the replacement capacitors may also have an effect.? Three 68uf 450V capacitors replaced the two 20uf at 600 V capacitors; about 22uf versus 10uf in the

Oh, after looking, the bleeder is rather too small to make that difference. Sent: Tuesday, August 13, 2024 12:31 PM To: [email protected] Subject: Re: [HallicraftersRadios] Re-membered

Also expect a voltage increase due to switching to semiconductor rectifiers though 250v seems like quite a bit. I only experienced increase like this when I removed the swinging choke which was not

You can find a few technical discussions on the HT-37 at: HT-37 | WD0GOF<https://wd0gof.com/hallicrafters-radio/technical-discussions/ht/ht-37/> Walt Cates,

Re 1000 volts: How is the bleeder? -- don??? va3drl

Thoughts on the dead 40M scenario. Trace the signal path and esp take a hard look at the band switch and any series chokes that might be open. 73 dave wa3gin

Hello all. Somehow, this group disappeared from my groups.io list, so I re-applied. Back in the 1970's I ran an HT-37 with good results--a fine transmitter.? I sold it to a friend, and after about 6

Hi Don, Yes, it's a 0.5 ohm resistor.? I noted this in the post just before the one you cited. */g/HallicraftersRadios/message/30774 (

Halden, this is rather late too Re your comments in [quoted text] and pics in /g/HallicraftersRadios/message/30775 I Halden, I see it much the way you describe, but we

Sent: Monday, August 12, 2024 2:09 PM To: [email protected] Subject: Re: [HallicraftersRadios] HT-37 transformer failure due to rapid STBY-->OFF-->STBY Don I am not posting here to

DonI am not posting here to argue, I am trying to understand what the posted data means and how it adds to the understanding of the HT-37 power transformer failure.??So far, there was almost no

I agree... it's ALSO a damned good idea to not only strip off the old "repeats", but take away any/all leftover Email addresses, too! Tom - W?EAJ ------------------

Don"Abstract—The half-turn effect is present in transformers if thewinding leads are taken out from the different sides of the core.The result is an additional half-turn in one of the core windowsin

Jim they are both right, but for the sake of argument the in-phase is right, and it is right for a long time, but when the switch closes there is a good chance that the combination of left over flux,

Ooops sorry that was a copy of Jims post enlarged so I could read it I will delete it on line later Jim if you are going to measure the volts or amps , you need a meter and two leads, and then the

Jim, by now this stuff might have been clarified, so there is no need to continue reading, but if not I am just going to try to explain my understanding of his post He said: These surges occur only

OK, back to the beginning.Some of Halden's scope images show the transformer's primary current in phase with the voltage across the primary, a few show a 90 degree phase difference with voltage

DonIn a transformer, a half turn starts on one side of the laminated core and exits on the other.? Since the Weller has that plated copper tube entering the core on one side and exiting the core on

Guys; Jim and Mike, a reminder. there might be some truths in here, but it seems you are going far off the intent of this topic. The space would be better served by getting US back closer to