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Well seems like radio is doing half power, thought one of the pa finals gone bad so pulled both and tested.. both test ok, before going farther going to ask for some help, the pre drivers look a little tougher to remove thanks

Can some please tell me what size this choke is? It looks familiar I’ve seen the same size in other sweep tube amps.

I just wanted to start this off by saying thanks for all the help over the years from this website and happy new year and merry Christmas. Well with the dak it receives fine, mod meter is moving I can see signal on my sdr. No audio no rf power? Tubes tested good, saw a few caps looks iffy and...

Ok got a few of these radios trying to get one working, story to this radio there was an outdoor PA speaker and the speaker was hit by lightning, PA Jack is removed.. originally had nothing at all no Rf power and no receive. I have replaced q51 q55 Q37, powered it up and was stuck in transmit...

I got 2 of these radios both dead, but this one is close, so far I have replaced q54 and tested q55 and got almost a 2 watt carrier 6 pep watts, replaced both finals C2312 (Tested good) with c1969 both good transistors and all biasing diodes including d93 but still nothing also tryed vr10...

Story of the radio is had a PA speaker outside supposedly the speaker got hit by lightning the radio turns on fine everything looks OK no transmit no receive. Q37 gets very warm and has 13.8 on all 3 legs. Was going to see if any one had any ideas? Pa jack has been removed? Was going to test for...

Cobra blue face 350 with 2 2879s seems like the relay is sticking after it warms up it stays keyed up, untill power is turned off on amp. Don’t see anything like a bad cap of anything burnt could it really be the relay? I got the amp used so it never work and don’t know the history

how would I go about applying a ring modulator to my cobra 2000? Guessing tp7 and tp8 have something to do with it.. what other things are needed? Radio is already direct injected just curious what the gains are? Thanks a lot any input would be great

have a cobra 2000 with no power at tp7 or tp8... if I run a jumper wire and power tp7 I get a 5 watt carrier?? No audio though radio is Direct Injected. Any input would be great...

Looking to direct inject my Demco.. I would like to inject at the transmitter and leave the modulator box alone... but was going to leave this pic for everyone to enjoy.. thanks and I love this website just became a member but was always checking you guys out... thanks for having me...

Need help injecting my dx2517? It’s a ept690010d board with dual 520 mosfets any help would be great.. just need the injection points.. seems like there is maybe some about c235 and a resistor ....