Re: Re-membered (new to me) HT-37
¿ªÔÆÌåÓýHalden, Russ too Re ???¡°just a tad above 1000 V in STBY mode.¡± ?I think I made a question comment on Hilden¡¯s? topic, saying that I could find no information at all for the conditions under which the voltages in the chart or elsewhere were taken; so I am guessing? / we ?are guessing? ?, and as I recall there is no AC voltage anywhere for transformer HHv or the 5R4 plate voltages. ?? Without knowing enough about the operation, if one guesses or knows that STBY draws very little current from B++ , the power supply may well have been designed to unload into the higher voltage region typical of capacitor input filters.? and I should not say it here , but dumping a small current from the 8 Henry ?is not at all the same as dumping the energy of its rated 150 mA somewhere when turning the rig off with no pause in STBY. ? From: [email protected] [mailto:[email protected]] On Behalf Of HF via groups.io
Sent: Wednesday, August 14, 2024 2:15 PM To: [email protected] Subject: Re: [HallicraftersRadios] Re-membered (new to me) HT-37 ? Hi Russ, The 750V marked on the schematic might represent the voltage during key-down.? The HV in my HT-37 with the original tube rectifiers is just a tad above 1000 V in STBY mode. What kind of inrush current limiters (part #?) did you install and where? Cheers Halden VE7UTS _._,_._,_ -- don??? va3drl |
don Root