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“ In France, we're limited to 500W, but I wonder how in the USA you can reach 1 kW without exceeding the maximum Eimac values.” how do you reach 1 KW input or output? In France, the power limit

Yes, power is never calculated with peak voltages. 73 Peter, DJ7WW -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] SB-1000 Datum: 2025-04-16T08:05:53+0200 Von: "Adrian Fewster via

If anyone sees this book at a Hamfest, buy it!! This is a great book.

Jim, W6SAI, best book around!!! Sometimes called the West Coast book, sometimes called the big green book, the Radio handbook by William ?I Orr, great stuff!!! Heathkit and Ameritron were able to

I agree with you. That's why with a 2500 V HT I chose a -9 V bias which brings the quiescent current to 2 x 50 mA. The curves I posted are with the original Drake L-7 schematic where the grids are

I believe the problem isn't the voltage itself, which would be found (measured) between gate and ground. The problem is knowing where, in the circuit, the input power is dissipated. The gate-to-ground

Just to add some elements to the discussion. Here's what I noticed on my Drake L-7, so with 2 x 3-500Z. The -9V bias on the grid is generated directly on the grid; the 9V zener is not in the cathode

Pg=Vgc X Ig

VK4TUX.? ?Nope.? that -75 vdc is for BIAS? voltage and only when operating Class C.... (either grid or cathode driven). Look under? cathode driven....and 0 vdc? bias voltage. U will see 215 V

Yes, that’s what Eimac says typical grid should be. I Eimac also states max limits: Ig 108mA Ip 400mA max output 740W but Heatgkit SB-1000 and AL 80B must have special permission from god. Their

I can't find this magic formula in the Eimac documents I have. Could you post this document or a URL that allows us to find it? -- F1AMM Fran?ois De la part de Adrian Fewster via

1st, voltage squared divided by resistance equals power. 2nd, The Eimac formula for grid dissipation is: Pg=Vgc X Ig where Vgc is the peak positive grid to cathode voltage and Ig is the DC grid

Eimac states driving impedance is 115 Ω grid dissipation = peak voltage X grid current. so at 100W drive, peak grid voltage is 150V 150V X 0.2Ig = 30W grid dissipation. 30W I don't think you

I own a Heathkit SB-1000. Have not had it to long, just a few months. Had a few issues and just wanted to share them and what I did to fix them. one day on 80M I think I hit a bad something. Bad tune

Jim, VE7RF, that is a boatload of FB info!!! I had not had a chance to respond but have read it twice and may need to read it a few more times and drill it in. Thank you!!! Great contribution to me

Is there a way to remove the red tx led without taking off the front panel?? I cannot see in the back because of the large filter caps.? TU ..Bill

Tom is great. Just email him again

Yeah. Weird. It printed out fine here. "Email me at gudguyham@.... Lou" Alek VK6APK

Ok, thanks. I just emailed you Lou

Whoops @aol.com. Sorry Sent from the all new AOL app for iOS