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Looking in the MFJ catalog, it looks like the xmfr ( part @406-1109-2C ) has the following ratings: Secondary: 1047 vac? 0.1Adc 22 vac? 1.5Adc? CT 5.2Vac? 15Adc? CT Primary:? 90 - 140?? 205 -

Snap! Yes, it is a specifically designed transformer and I'm sure Tom will have the correct information on it. 73 from sunny Western Australia where we have made it into 2025. Alek VK6APK.

Contact Tom W8JI, he will know for sure! ?He’s the only guy I would rely on for exact data concerning that transfomer. ?Lou Sent from the all new AOL app for iOS

Would Ameritron forward there suppliers info?

I have a transformer company that might be able to assist.? Does anyone know the exact spec of the Ameritron AL-80B power transformer?? ?I'm assuming secondaries are? 9VAC @ 1.5A,? ?3.53VAC @

Alek, QRO Technology made that same mistake with the fan speed switching on the 2500 amp. ?It eventually ruins the switch. ?In one case I had the warm up timer would reset every time the guy changed

I know that the W6PO amps I built for 2 meters and 220 mhz shorted out the resistor for operating bias. But he was a smart guy. :)? Some paperwork I have from? K9EK does the same thing.

In older commercial grounded grid amplifiers, it is common to see a cahngeover relay used to switch between a zener diode or similar bias regulator and a bias cut off resistor. My question is, why did

Before retiring and while still active in the field, precision D.M.M.'s were important, not in themselves, per se, but as a reference point in any possible report ensuing from having to have employed

GM3SEK? Here is a link that turned up. No longer sold it seems, and a quick search for gerbers turned up nothing for me. The schematic is in the manual so one could do a board run if so inclined. Bob

http://www.ifwtech.co.uk/g3sek/

Attached to this email are the manuals for the G3SEK tetrode and triode boards as well as the tetrode board design documentation. Maybe the moderators can add these to the group files section.

Mike, Try this: https://web.archive.org/web/20180408212726/http://www.ifwtech.co.uk/g3sek/boards/tetrode/tetrode-1.htm 73 Bill N4LG

Hi, Would anyone have the G3SEK schematic and PCB drawings for download? The link seems to be broken for me: http://www.ifwtech.co.uk/g3sek/boards/tetrode/tetrode-1.htm Cheers, Mike Peace VK6ADA

I have ran into a couple of those online. Wanted to put one in my Thunderbolt, as it uses the gas filled tubes to regulate the screen, but I was gonna try a string of Zeners soldered into an old tube

The tetrode boards aren’t particularly complicated if you only implement the screen current trip. On my tetrode amplifier, I eliminated the control grid current trip and ALC circuitry. Their primary

Can't beat the simplicity of a triode amplifier.

Sell your 4CX250's and purchase the 3CX400's ?

Main reason for looking into the 4CX250 is I have a ton of them, like 10-12 of them, sockets and chimneys as well. My father-in-law who is also my elmer built an amp around the RF deck of a KWS-1 that