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Okay, I think I can disregard the black ground wire? I say this because when checking on the voltage on the large pwr supply cap behind the meter, and placing the negative probe on the negative of the cap and the positive probe on the chassie, I get -694. So I suppose -691 on that black ground...

Hello Cable Guy, Hope you were able to rest up a bit. No, the audio had gotten low after I figured what was causing the growl and taking off the solid grounded buss wire from pin 3. All I can describe is the radio's mic jack was loose and by placing a mic on and taking it off the connector a...

Hello Cable Guy, The growling apparently was from having the radio's mic Jack wired wrong. I believe finally I may have it now wired correctly. I blew out a component on the echo board trying to square things away. The echo board is no longer installed. I have now connected the input...

I appreciate you replying back. I thought after what I had mentioned above, everyone abandoned me! I figure being truthful always got me through life so why stop now! Working on your steering and suspension as well as ball joints can be hard work for sure. I think my 79 Blazer had bolts...

Hello Cable Guy, This morning I figure the out the wiring as far as the audio in and out. I simply took an ohm meter to the pin 2 (audio) of the mic jack and then probed around on the echo board connections until I had continuity. Then study how it was connected, along with the PTT in the same...

Hello Unit_399, Sorry I had missed your post. Great idea about by-passing the eternal supply. If it had a 12 volt connection on the back I would had tried that because the thought did crossed my mind when Nomadradio first told me about checking voltages and mentioning the supply. But I will...

Hello Cable Guy, Everything seem okay until the finals blew. After replacing the finals, the mic jack was loose and a couple of connections broke. Apparently this was what really started all the conflict. And yes I would unplug the radio and then turn it on to drain any excess voltage from...

Oh my gosh. Seriously... I hate to admit something as bad as I am going to admit, but I have a large quantity of egg on my face. I am being totally serious, and I am deeply sorry for the time I am taking up here. After looking at the mic jack, and I mean after a few times, something kept...

Well for a Hobbyist, your doing well on your thinking. Without the mirror board installed, and everything connected and the radio in transmit, here are the voltages. Factory Voltages on the left and mine on the right. 1) 4.54. --- 2.57 2) 4.54. --- 2.58 3) 4.55 --- 2.59...

Hello Cable Guy and thank you for chiming in. Okay here is what I measured. Factory voltages to the left, mine are to the right. 1) 4.57. ---- 4.40 2) 4.58 ---- 4.50 3) 4.58 ---- 4.50 4) 0 ---- 0 5) 4.51 ---- 4.47 6) 3.33. ---- 3.33 7)...

Okay, mic jack looks fine. I disconnect the two brown connectors again from the echo board. The receive sounds fine and it didn't go into transmit. However, I took a small wire and created a short jumper and placed it across the yellow and orange wires in the two brown connectors after...

Hello, Well I am scratching my head on this one. I placed the volt meter on J26 and indeed it was zero volts in the receive mode. I then checked J27 and it had 8.5 volts on it. Incidentally I have had the echo board removed a few times, trying to figure where the growl was coming from. I...

Hello Nomadradio and thank you so much for your reply. I have not taken any measurements as of yet, but I thought about a few things that may not be useful in the equation of this situation, but I thought maybe I should mention it anyway. Originally and shortly after replacing the finals, my...

I am not so sure its the echo board.... I removed the two top right hand brown connectors off the echo board and then inserted a very short wire to the two brown connectors after removing them from the echo board. Picture the two connectors side by side laying flat next to each other. The...

Hello, Well after replacing finals from the help of some good folks here, I am getting this growling sound that is over bearing and knocking out my receive. By means of elimination of different circuits I discovered by removing either of the two top right hand jumpers on the echo board this...

Well thats better news on Bennie than what I had thought. Life in general can certainly create new paths for us to go down, no matter if we plan for it or not. Well I like to thank you Nomadradio for your valuable information and for your willingness to share it. Over the many years you have...

Nomadradio, I can't say enough about you! Seriously. I ordered 10 of those 1969s. I remove the old and soldered in the new, and they both worked just fine. Whats the bias, 3.5 amps? I think its 5 volts for MOSFETs but being bipolar I think its about 3 to 3.5 amps on the bias. Is this...

Thank you for the link. I down loaded in case I need it in the future. Any radio information is always good to have on hand. That diode that you posted is different then what's in the radio.

Very interested Nomadradio, I like this concept. You are always teaching us something, thank you. 73 Rf Krazy

Hello 999, These diodes are mounted on what looks like a thin copper slab/plate. The diodes themselves look like a glob of plastic almost like the shape of a half of a ball if you will. Anyway, would you or anyone know where to purchase these? Or even know what they are actually called? I can...