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An 'A1' triode is a Low Mu Tube and will NOT work as an amplifier at Radio Frequencies. Like Medium Mu Triodes, designation ending in A3 and A5 also will not work in RF Amplifier service They are used

Well, I picked up the amp and it looks pretty much complete minus the tubes and vacuum variable which I have already found one. I was looking at some of the Russian tubes and found that they have a

Just letting you know, Effective? Nov 2024 ECONCO no longer tests tubes at no charge. The fee is now $150 per tube. thanks to the new corporate owner TransDigm. Reid Re: Need Help with Amp Supply

That helps, I was thinking maybe he meant the plate choke. Thanks [email protected]> wrote:

Plate Blocker is the big capacitor that is connected to the plate tune capacitor coming off the tube anode. Should be 5kv or more rated. Shorts won't always show with a multi meter till they get

Hey Alek, How's 20 meters been down in your neck of the woods lately? Maybe we can get on and say hi again one of these days soon along with your "Jack Daniels" friend! 73 and happy new year, Bob

Hal and all, I've started testing each tube in each socket individually and will post my results hopefully later today.? The first tube doesn't show any shorts with a DMM.? I don't know what a

Yes, that's good Alan. Whenever I get an amplifier in that is wired the "wrong" way, I always make the simple change. 73, Alek.

New Harbach l4b / l7 board kits with new 330uf rubicon 5000 hr caps also 125 bucks

I have four Henry amplifiers (2-KD-Classic, 2KD-5, 3K-A, and 3K-Classic-8877), and all of them have the resistor always-in-circuit, with the relay acting as a bypass. Likewise, my Drake L-4B , with

John, It could be a cold solder joint in a tube pin. If it was an interelectrode short, you could use a DMM to explore. If it was a defective plate blocker it would show up with a meter, out of the

Happy New Year, I have a fully assembled, tested, but never used Heathkit Shop power supply upgrade board for Drake amps for sale. Price is $125.00 plus shipping from 23418. Details and pictures are

I believe Econco will function test transmitting tubes. You might check with W8JI, too. Hal Mandel W4HBM

Happy New Years Everyone, Its that time of year when I'm spending more time in the shack and am back looking at the LK-500 ZC.? In response to the many (much appreciated ) suggestions that I could

That's a good suggestion Mike, thanks, I'll look into it.

Maybe locate the power amplifier from a Yaesu FT-736 6 meter module. The 736 parts have gotten cheap.

I'd like to acquire a 10 - 50 watt linear power amp to use with a 50 MHz. beacon transmitter. Input must be in the 10-18dBm range. Kit or assembled or "needs repair" is

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??

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