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Nick,it seems as though you may have a poor connection somewhere inside the realm of the tank circuit. ?This could be at the band switch, the connections of the coils to the variables or just about

All, Question for the group. I am working on an Ameritron AL-80 (not A or B). When tuning it up I run out of load. I max the load cap out at zero on all bands. (fully meshed/max capacitance). It

“Although it’s a handsome looking amp it’s certainly not the best performer in its class. It lacks inductance on 160 and the tank isn’t so good on 15 and 10”. So true, Louis. As Jim

TenTec buit?their own variable capacitors. ?So their plates are unlike any others. ?I have some plates and if you want you?ship me the cap I’ll rebuild it for you. ?I should have a few plates

Hi ALL, I have amongst my Henry Amps a 3K-A. (My 3K-A was manufactured in 1972 and still works well.) It has the plate current relay in the B- lead to trip on over current above 1A. 5.2

I have a lot of parts for amplifiers and stuff. I handle estates for the local ham club and have processed estates for several Collins Radio engineers. They collected lots of parts over the years. I

Thanks Steve. I do not any of the power supply, just the RF deck, but did work it and it pulls in at just under 22vdc -- 73 Nick KC0YKO

Thanks Chuck. I was clearly over complicating this just because I did not recognize the "plate circuit relay" terminology. You were correct, I rolled the variable power supply up and it pulled in at

Hal, Thanks for the reply. I do not have the power supply, just the RF deck. -- 73 Nick KC0YKO

Perhaps that relay was used in that application in an effort to reduce the voltage/current to operate it to low values, such as from a later-model (but older) transceiver with limited T/R relay

Dear Nick, My GUESS is the P&B magnet is 24 to 28 Vdc. However, if you trace the wiring to the coil, back to the power supply, you may there deduce the coil voltage by energizing the xfmr

Years ago the coil of a plate circuit relay was in series with the plate of a vacuum tube set up to conduct at the pull in current when the tube was biased on. Using ohms law, 0.009 A X 2500 ohms =

All, I have an old homebrew RF deck that the T/R rely is a Potter & Brumfield LM11-2500. I can't find what the coil voltage is. In the 1954 P&B catalog the LM series is titled?Sensitive Plate Circuit

Albany County Fasteners: https://www.albanycountyfasteners.com/Phillips-Pan-Head-Machine-Screw-M4-x-7-p/1066-1010.htm K9ER Lowes have them for delivery!! Home Depot seems to be down here in UK

I have recently acquired a Ten-Tec Centurion model 422 that is in very nice condition, but has a blown up bandswitch and the plate tuning capacitor was arced.? I might be able to salvage the

Lowes have them for delivery!! Home Depot seems to be down here in UK this morning Im sure some specialists would have them cheaper for mail order When I am in the US on business I try and visit

As in any quality-designed-and-built power amplifier, yes, there is a good-sized, large inductor from the output of the pi-network to ground to guard against exactly this kind of failure mode. What

Actually, they read "222M"; so it was clear they were 2200 pF. A 5 kV-rated cap is not likely to withstand 3 kV plate voltage under highly-mismatched circumstances at the legal power limit (such as

Did the caps short and put high voltage on the antenna causing the amp meter to peg? Is there a rf choke at the output connector?

Those oem 220M? caps are each 2200 pf.? ( 6600 pf in total for all 3 of em in parallel). The problem with discs is..... current handling capability.? ?Upper HF will result in the highest RF