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Parmak 1929 Help
#20

(05-23-2015, 12:37 PM)mikethedruid Wrote:  This radio should play very well actually, and pick up all your local stations with decent volume, even with a fairly short antenna and a good ground. The 71 should be in the socket that connects to the speaker output, since it is the final audio amp. The grid voltage on it should be about 17-18 volts according to its data sheet (see above postings). Again, I strongly urge you to trace the wiring of this set, and make a schematic of your circuit. Then check it against the schematic I posted of a typical TRF set. There may be differences, but it will be similar. Once you have done this, showing the colors of the various battery leads and where they come from in the circuit, it will be much clearer where each connects, and how the batteries (or power supply) should be connected.  Also, check all your tubes. Make sure they are all good. A very weak tube that still lights will cause you to lose the amplification to the stage, and cause a very low output.

I will do that.
The 71 is in the socket that the plate is hooked to the speaker it was not originally. I tested the tubes and had one that showed a short and I replaced it.  The grid voltage I show is neg your post just says 17-18v Is that a problem? 


Messages In This Thread
Parmak 1929 Help - by Eric - 05-20-2015, 04:24 PM
RE: Parmak 1929 Help - by Radioroslyn - 05-20-2015, 06:00 PM
RE: Parmak 1929 Help - by Radioroslyn - 05-20-2015, 06:20 PM
RE: Parmak 1929 Help - by Eric - 05-20-2015, 09:16 PM
RE: Parmak 1929 Help - by Radioroslyn - 05-20-2015, 10:30 PM
RE: Parmak 1929 Help - by Eric - 05-21-2015, 09:31 AM
RE: Parmak 1929 Help - by Eric - 05-21-2015, 12:04 PM
RE: Parmak 1929 Help - by mikethedruid - 05-21-2015, 03:34 PM
RE: Parmak 1929 Help - by Radioroslyn - 05-21-2015, 07:09 PM
RE: Parmak 1929 Help - by mikethedruid - 05-21-2015, 07:26 PM
RE: Parmak 1929 Help - by Eric - 05-21-2015, 08:30 PM
RE: Parmak 1929 Help - by mikethedruid - 05-21-2015, 10:40 PM
RE: Parmak 1929 Help - by Radioroslyn - 05-22-2015, 06:16 AM
RE: Parmak 1929 Help - by Eric - 05-22-2015, 08:06 AM
RE: Parmak 1929 Help - by Eric - 05-22-2015, 08:40 AM
RE: Parmak 1929 Help - by mikethedruid - 05-22-2015, 10:24 AM
RE: Parmak 1929 Help - by Radioroslyn - 05-22-2015, 09:24 PM
RE: Parmak 1929 Help - by Eric - 05-23-2015, 10:26 AM
RE: Parmak 1929 Help - by mikethedruid - 05-23-2015, 12:37 PM
RE: Parmak 1929 Help - by Eric - 05-23-2015, 01:16 PM
RE: Parmak 1929 Help - by mikethedruid - 05-23-2015, 05:56 PM
RE: Parmak 1929 Help - by Eric - 05-24-2015, 10:36 AM
RE: Parmak 1929 Help - by Radioroslyn - 05-24-2015, 11:23 AM
RE: Parmak 1929 Help - by Eric - 05-25-2015, 08:38 AM
RE: Parmak 1929 Help - by Radioroslyn - 05-25-2015, 09:50 AM
RE: Parmak 1929 Help - by Eric - 05-25-2015, 12:10 PM
RE: Parmak 1929 Help - by Radioroslyn - 05-25-2015, 02:02 PM



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