Does anyone have this book? I'm thinking about buying it, but I want to make sure it not only has the schematic, but also has the parts list for my Thunderbolt 305.
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Black Book Of CB Linears?
- Thread starter V8Vega
- Start date
THANK YOU! I would have been really upset if I had spent the $25.00. I called Ken's shop, but the woman there could not answer my questions.
Thanks...I have that schematic, but am not educated in electronics. The variable power pot doesn't work anymore and I want to replace it with a rotary switch that will accept the stock knob to keep her looking mint. I was looking at this switch, but am not sure if it is suitable for this application. When I find a switch, I will then try to figure out what resistors and other parts I will need for the Hi/(Med?)/Lo output.
Switch: ROTARY SWITCH ,3P3T , NS - eBay (item 220685418372 end time Dec-18-10 18:45:24 PST)
For someone who is not "educated in electronics", the repair/ modification that you want to install is kinda like re-inventing the wheel but, when you get finished, your "wheel" will not be round.
I would strongly recommend that you find a 10,000 ohm (10 Kilohms) potentiometer and replace it as the circuit was designed to operate.
The 10K pot acts as part of the Grid-leak / bias resistor system for the driver tube; to replace that pot with fixed resistors, you would have to at least temporarily install a variable resistor (pot) and measure the values where the wattage output is where you want it for "Hi-Med-Lo". Then, you would have to de-install the pot and put the switch in with the resistors hanging off of it; is it worth it?
I believe that the ability to control your amount of output in a variable manner is much better than the "I'm gonna flip the switch and go to the 'Next' stage" concept.
However, YMMV.
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Bingo.
Very knowledgeable guy to talk to.
Sadly, old age doesn't let him work on electronics anymore.
Somebody recommended that I use this one and cut down the shaft. I guess that's what I'm going to do. I hope this pot lives longer than the POS that is in this thing.
10K-Ohm Linear-Taper Potentiometer - RadioShack.com
Toll_Free
Well-Known Member
The thing has had virtually no use! It's as if it went bad from sitting if that's possible.
I see some electrolytic caps in the schematic. Those do, and probably have, derogated just by sitting.
Good luck with your project!