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Hullo Bill, So you're squeamish about 20 or 40 amps on the heaters, aye? Well, wait 'til ye graduate to Valves with Lifting Handles! Some of those babies need 165 amps to warm them up. Rich

A single GS35b is a nice choice as well per your original power objectives.? And at 4.7KV it will have pretty nice efficiency.? I ran one here at 4.4KV for years.? Minimal heater current

20 + amps at 12 volts??? just to light up 1 tube ,,,,,???? 2 tubes would be 40+ AMPS !!!!! -- link to

Thanks everyone for replying. I live in Northern Ireland, call sign GI0UTE.? I'm not aware of any qro builders nearby.? I have ordered a few books as have been suggested and have stared reading some

Here, the paralleled pair of Jennings? RJ2B output vac relays are installed.....along with the 7-16 DIN output connector. Also installed is the 1/2" silver plated tubing coil, used for 20 + 15m.?

Stated he was in The UK. Mike

You don’t say where you are located or provide a call sign so those of us replying don’t know where you are for parts recommendations. The Eimac book “Care and feeding of power grid tubes”

I have found "Valve Amplifiers Explained" by John Fielding ZS5JF quite helpful, its published by the RSGB. Mike VK2AMF / G3XEF.

Dear Des, Welcome to the forum. You can't do too much better than the collection Of builders and thinkers hereon. In the amplifier schematic you posted I wonder If the Input Network Inductor is a

I would interject that The Radio Handbook, edited by Bill Orr and/or "Editors & Engineers", is generally much more informative than almost any of the ARRL handbooks for amplifier circuitry, in

I'm sure you'll get a lot of input from real experts today, but I will give you a few high level comments.? Check out w8ji.com and read everything there about amplifiers.? Tom designed many tube

Hi guys, I have been subscribed to this list and reading messages for some time, but I believe this is my first message, so hello all. I am a ham based in the UK and have been interested in amplifiers

Merry Christmas Warren. Sent from the all new AOL app for iOS

Gentlemen, I want to thank you all for your input and help and especially to Lou for giving me some critical information. I gave the amp a road test today with a friend on 6 meters and he said it

OK, thanks for clarifying that, Lou, as it wasn't clear before. 73, Steve K0XP

NO NO NO. Not grid driven. ?Cathode driven! Neither?Carl or myself did grid driven! ?It was cathode driven. ?Yes I know 20?watts drive sounds crazy but handling the bit of positive feedback with

Yup; he was never real open about how he did some of the "successful" schtuff he was able to accomplish. So, Lou: are you saying that you believe Carl converted this "SB-206" to full grid-driven

Yup! Leave well enough alone. Sent from the all new AOL app for iOS

Yeah...I suffer from mess-with-it-itis sometimes but not in this case.? :) If it ain't broke, don't fix it. Warren

There should be about 70-90 ma. ?of idle current. I’d leave it alone. Sent from the all new AOL app for iOS