Recent content by Sammitch

I have the new final and driver on the way. Just to clarify, the 47 ohm resistor will go from base to emitter, which the schematic shows as ground, or should it go to chassis ground? One more question. Are 1n4148 diodes OK to use for the Tech Bulletin #1210? I assume, that resistor being in...

Will do. I want to thank everyone for all the info and help. I have tracked down new NEC 1306 and 1307 they say were manufactured in the late 70's, I don't know if I should believe it or not though. Kinda pricey but don't have much choice I guess. Thanks everyone, will post after I get new...

Thank you 399, I have all the tech bulletins from cbtricks printed out. But cannot find any reference for a cap to go from the collector on the final to chassis ground, or for one to go from the emitter to ground on the driver, although that one can do no harm as the emitter on both the driver...

I unhooked the base and collector legs and all lights stay on in SSB and AM, no dimming at all. Seems I have a shorted driver and final, but I would have sworn they checked OK when I pulled them from the radio earlier. I still have good receive on SSB, but very weak on AM because I am down to...

I have completely run myself ragged on this radio. Let me refresh everyone on it. When I bought it, it had no transmit or receive. I used Deoxit on all the switches and that brought SSB receive back to life loud and clear, I replaced TR5 and that brought AM receive back loud and clear, receive...

I used a 1N4148 in D2, and D26 a 3.7 volt Zener as one of the tech bulletins recommended reducing D26 down from 5 volts to the 3.7 volt. For that Tech bulletin, I used 2 1N4148's for the mod on L3, and I have been wondering if that is not causing my problem, just have not had the time to...

I have installed a brand new relay and it does click when you key the mic, no chattering, just a good solid click. Yes, I am going to have to check each and every component in the transmit section for voltage as when it is keyed is when it destroys TR5, the little RF Amp transistor, in receive...

Is there any wiring inside the mike that needs to be changed around? I read somewhere on the internet that on a relay controlled radio if the wires are not right, when you key the mic, you are making 2 connections to ground and it would be lights out. I have just a standard Cobra coffin mike and...

I did change c179 first with a new tantalum, then to an electrolytic and no change. I am wondering if one of the new caps went bad, [I have always heard, if electronics go bad it will happen within a few hours and if they last that long they will last a long time] I don't own a capacitor...

Hello everybody, I got this off flea bay as parts only- non working and they were right. I recapped all electrolytics, sprayed all the switches with Deoxit and she roared to life in SSB mode receive, no transmit at all. Still had the stock driver and final, so I pulled them and checked...

Yes, I use a dummy load. As a matter of fact, I checked it both on an antenna and my dummy load, readings were very close, the antenna was a little different but not much. I have an Imaxx 2000 and the swr is 1.1. The radio is working great, everyone says it sounds terrific. I am wondering if...

Well, I turned up the wattage and yes that seems to be it. Only problem was I had to turn it all the way up to just get the meter to the edge of the cal mark. Then I compared the internal against the external and they no longer match. The internal showed 4 watts, the external showed almost 6...

After I recapped it, I checked it and it was about 2 watts on both the internal and an external meter. I just figured I would leave it there since it still has the original driver and final in it and not push things too much. That does make sense now that I think about it. I will turn it up...

The modulation part of the meter seems to work in AM, but when you try to adjust the calibration, it will not go over to the cal mark. It just goes over about 3/4 of the way and you run out of turn on the calibration pot. The meter is not stuck, I removed it and checked it by moving the needle...

Hello everyone, I have a 142gtl that is almost pristine. I just changed all the electrolytic caps and she talks and sounds great. The only problem I have not been able to track down is the swr/mod meter not working as it should. It will not go all the way over to the cal position when turning...