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V-rms obviously yields watts-RMS, and Volts-peak gives watts-peak. Because SSB is measured by it's peak: Peak Envelope Power. RMS only applies under continous carrier conditions. Steve, K0XP

On Wed, Apr 16, 2025 at 08:20 AM, KG2RG wrote: > > Jim, W6SAI, best book around!!! Sometimes called the West Coast book, > sometimes called the big green book, the Radio handbook by William ?I Orr, >

That's what I thought too.? It shoulda been? RMS cathode voltage? X? DC grid current? =? Grid dissipation.................. BUT it's not. Eimac uses? PEAK? RF? cathode voltage X? DC grid

That 1 kw pep output from the single 3-500Z? is because they are using IVS? (intermittent voice ratings) for SSB.? ?That operation was approved by Eimac. IE:? it's because of the low duty cycle

Francois.? No problems with removing all those grid caps and grid chokes.? ?Save the 2 x grid chokes. Use 3 x separate copper straps? for each tube....then bond the? 3 x grid pins directly to the

Jim, et al. I just learned a few things that should be of interest on the subject of Econco. This morning I had an inquiry from a local broadcast engineer I know. He asked me about a 4CX12,000A

“ 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 is

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 not

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 groups.io Envoyé :

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 can

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