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Post by Marc on Feb 26, 2009 20:04:30 GMT -5
Tick Here is a dumb question. What mic do you have connected to the radio?
Marc
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Post by Deleted on Feb 26, 2009 22:49:28 GMT -5
Shure 444 non-amplified. I tried a few different mics.
I made more progress. Looks like I have a tube problem in the final (6BQ5) and driver (6BA6). I took them out of my Robyn 123B, and I now get a DK of 4W, but no modulation. Which is the exact opposite of what I got before (no DK but Mod was working). I tried various combination of tubes, but ended up with a DK but no modulation, or if I put the original back, the no DK but mod light works.
Anyway, I tested the tubes on an Eico 635, but I guess it is not a great tester.
Is there any equivalent to 6BQ5?
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Post by Marc on Feb 26, 2009 23:43:48 GMT -5
a 7189 or an EL84 is what I show
Which swapped out tube gives you the transmit?
Marc
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Post by Deleted on Feb 27, 2009 9:13:17 GMT -5
Looks like the 6BQ5 gives me the transmit, but with no mod. I am wonderng if I have a component failure underneath.
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Post by Deleted on Mar 20, 2009 22:29:57 GMT -5
OK, I put this back on the bench for the first time in several weeks. With the original final tube, I don't get dead key, but I get about a 1.5 watt swing if the mic gain is turned all the way up, and the modulation light works. This is also the tube where I get intermittent 3.5W dead key, and then when I talk into the mic, the dead key completely drops out.
If I replace the final tube with a known good one, I get 3.5W deak key, but no modulation or swing. Mod light not functional.
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Post by Marc on Mar 23, 2009 11:32:05 GMT -5
I would start by replacing V5 12AX7 and V6 the other 6BQ5
with known good tubes and then go from there.
Marc
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Post by Deleted on Mar 23, 2009 17:58:23 GMT -5
Ran into a jam. I tried numerous final 6BQ5 from other radios, and they all do the same thing. No DK, but the mod light still works. Only that one 6BQ5 does a DK with no mod. So my guess is that that one tube is bad, and the tubes that have mod all are good.
Will try what you said.
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Post by ic751a on Nov 9, 2009 5:40:46 GMT -5
More progress! I got receive back... Thanks to Nomad... Who is this 'Nomad' person? Is his name possibly Ron? Did he once live near Sacramento, Ca? |
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