Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

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



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Model 70 Cabinet Trim
musar , Well if you have any more questions feel free to post away . Sincerely Richardradiorich — 08:56 PM
Model 70 Cabinet Trim
Although I have not made any cabinets or cabinet parts for a couple of years, I still have some parts left over, includi...Steve Davis — 06:26 PM
philcorepairbench.com - shadow-meter
Thanks Ron.fenbach — 02:43 PM
Model 70 Cabinet Trim
Thank you, Gary. Before making my original post, I had clicked on "Steve Davis Cabinets" only to find that it...musar — 02:25 PM
philco predicta
Welcome to the Phorum, cgl18! I am not your resource for television repair, but lots of friendly help is available here...GarySP — 02:12 PM
Model 70 Cabinet Trim
Welcome to the Phorum, musar! You can send Steve Davis a private message (PM). The site is at the top of the Home page...GarySP — 02:09 PM
Model 70 Cabinet Trim
How do I contact him? The only contact information for him I could find when searching online was a telephone number th...musar — 10:38 AM
philco predicta
Hello, good afternoon, I would like to ask what the possible problem could be if I don't have an image on the screen. I ...cgl18 — 10:19 AM
Philco model 38 code 121 not receiving signal.
So one last question before I finish this radio. Regarding the speaker and output transformer. I salvaged the original o...Stormlord5500 — 09:31 AM
462ron
It’s on the bottom of the homepage of our Philcoradio.com homepage! Ron462ron — 07:20 AM

[-]
Who's Online
There are currently 546 online users. [Complete List]
» 1 Member(s) | 545 Guest(s)
Avatar

>