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With a little adaptation.... I used a pair of phantom transformers in a Heathkit Warrior 4x 811 tubes. Gutted the choke input and just used caps for the filters. Thing worked great until the kid (Joe Dirt) out of Banks OR decided he needed more and installed some 572b tubes.

A kid with a saws-all makes them worth much more once the copper is separated from the iron.

Difference between 80 watts and 120 watts is nothing on the receive end. To raise the s-meter at the receiving end 1 S-unit takes 4 times the power out. So, 80 x 4 equals 320 watts. That is where you have to go to lift their S-meter by 1 unit. Same goes for 800 watts-3200 watts, 8000...

The example I use is; Your truck will do 80 mph in second gear, do you drive down the freeway in second gear and expect your truck to last? Let it go into over drive loafing along and it will last much longer.....

I have run across the same problem in Palomar 300 2x4 tube amps. Instead of using a proper inductor/resistor to the plates of the tubes they used a ferrite bead. Over time the bead changes properties. It acts the same way you are describing. Take the bead off and install a ~~47-56 ohm 2 watt...

Hi Jim, A very handy piece of test equipment its a "RF Probe". It takes RF and converts it to DC voltage so you can use your volt meter to trace where there signal stops. I also use it to check multi transistor amps; Key up and use the probe on the input (base) and then the output...

I just can't leave anything alone...... Here is another thing to do. The slug is out of L10 tuning for driver transistor. I assume it is out because you found that was max power out. If so, unsolder the coil and take one turn off of it, put it back into the board along with the slug. You should...

TC9106PCobra 18LTD/20LTD: <L10, L7, TR14-AMC>Cobra 21GTL/25GTL, 21LTD/25LTD, Craig L104, Midland 200M, President P220, Andrew J, AR-44, AX-44, AR-711, AX-711, Uniden PC66: <L14, L10, VR5>GE 3-5804B, 5815A, Realistic TRC425, TRC426, Teaberry Stalker III: <L903, L905, VR8>GE 3-5804F, President...

Hi, you might check out Lou Franklin's web site and look for his PLL book, check out which radios used the same PLL (TC9106p) and see if you can find one that has more information. https://www.cbcintl.com/pllbook.htm

Not an older Cybernet o2a board. Wrong pll and not enough crystals.

Yes. All of the CB finals, AM and SSB, use the same leg configuration. It can be also used for the MRF 477, 497 finals if you know the leg configuration and get the right legs in the right holes, EBC CBE..........Some of the older rigs used a different type of final but again if you know which...

Or, a copper plate mounted to a Peltier junction

I have often wondered why someone running in the competitions didn't make a dry ice cooled box. That would keep the transistors WAY under 25 centigrade. Call them "Superconductor Boxes"

Sorry, I didn't read through all the posts before posting. There are to-3 can voltage regulators too that can run 3 amps and not have to use three 1 amp regulators.

No, just make them sound like a jet fighter taking off!

Transistors that run the fans... Are you sure they are transistors and not voltage regulators to keep the fans running at a steady speed? Can you read the part numbers? 7808 8volt 7812 12 volt these are positive regulators, the "79's- 7908 7912 are negative regulators.

Delay of the relay switching between TX and receive. Changing the value of the electrolytic cap from the keying transistor to ground will change the length of the delay. Larger value=longer delay. I never needed a delay as I worked as an auctioneer.............. He didn't either...