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I would have to disagree with the 2500V in the case of the GS35 specifically.? To get 1.5KW out, I think the Ig will be too high at that low of a voltage. I ran 4300V on mine and that was very nice

Thanks! I'm down with COVID right now, the junkbox has some other Ceramic button caps, I switch it out in a few days and let you know how I got on. vy73 Tim

Hi John, hope you had a Merry Christmas and do have a Happy New Year. Sent from the all new AOL app for iOS

Peter, You are of course correct. But due to the tappings I have options to get the voltage to where I want. The rectifier and the DC produced would be better if I settled on 3 phase, but I prefer

Steve, I haven't measured idle current of the transformer so I will do that when I dig it out from long term storage. To be fair, even if it idles absorbing a 1kw, which I doubt, I only get maybe 8

Hi Tim. Yeah, those big caps are no good on 2m ! She works great now with a smaller value cap. Rock solid power out. John VK6JX

Ha ha ! We sure are, Lou ! Some of us, learn a lot from you guys. BTW, my W1QJ converted SB220 6m amp works bloody well. The Japs don’t know what’s hit them !! Happy new year to all. John VK6JX

+1 on the blocking cap. I have a 2xGI7B project on the go for 144MHz with a very similar set up, and the looming possibility of thermal drift is a great concern. I thought about employing one of those

We are always learning! ? Sent from the all new AOL app for iOS

G'day Tim. Check (physically and electrically) your plate blocking/coupling capacitor very carefully. John, VK6JX, had the exact same problem with his GS35B model 2m amp, using what looks to be the

Thanks for that information Lou and thanks to Doug for the leg work. Carl, along with Rich, Tom, Ian White, Tony King, yourself, Jim and lots of others are the ones that have fed me with knowledge,

This amp was made in 2001 indicated by 11-01 all over the inside of the amp. No Heat on the Plate Choke. Looks bright red all over. I see no cracked caps at all neither. I just had time to take it

Hi Everyone, I built this little 2m amp a couple of years ago, it works perfectly in every way..... except for the thermal drift. Tuned up with key down, 300W out with 12W drive, within a few seconds

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With 3 phases anode voltage will be completely different as will be the rectifier stack. 73 Peter, DJ7WW -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] Building my first amplifier. Where

Ummm... before you settle on that monster, you might want to fire her up and measure the idling current, no-load. Then again, with some temporary load resistors across the secondary. The results just

First thing I'd do is copy the spreadsheet and revise the dropped Ep to no more than 2500V, perhaps 2550 at most, then design for that reduced value. Unless you're in a commercial establishment, with

GI0UTE. Thanks des

Hi Desmond, What is your Ham Radio Call Sign? Thanks, Walter KR4HV Sent: 26 December, 2023 12:48 PM To: [email protected] Subject: Re: [ham-amplifiers] Building my first amplifier. Where to

Hal, I might message g(m)0sek if I struggle,thanks for the advice. I have a 3 phase transformer with various taps. It's rated 20kva. I have tried single phasing it, and it runs ok. Less capacity