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 rebuild (Parker McCrory)
#1

I often take a break from the internet in January (some may have observed this in the past), but I have spent some time in the radio room.  A few years ago I scored a Parker McCrory (Parmak) console from a local antique store. I liked the looks of it due to the large dial and eye tube. We had it in out living room and I got tired of people asking 'Does it work?" So, I flopped it up on the bench and started some checks. The initial tests revealed the power trans and speaker field may be ok. Open primary on the output transformer. Next I tested the tubes. I found a weak IF tube (6K7) and a dead 6F5 and 6E5. All others tested good, even the 80! I started the recap. It seems to have gone well overall. You can see that I decided to use discrete e-cap instead of messing with restuffing. I connected to the output transformer on the signal tracer for testing purposes. 

Upon a slow power up, I was amazed to find it was picking up stations! It wasn't real strong, but showed me that everything was working. I started doing some fine tuning (not the alignment) and here was what I have found: Upon powering up it would sometimes make shrieking and popping noises. I noted that it had an (undersized) universal output transformer. It had been replaced at some point. It went dead on the 3rd power up, some some quick observations noted the tuning eye tube was showing it was tuning in stations. Ok, onward. A finger test on the 6F5 grid cap produced nothing. I poke with a meter probe on the 6F6 grid produced a hum. The 6F5 died, so I rummaged around and found a fairly decent replacement. This brought the radio back to life. I suspect this is what killed the output transformer, and probably the one prior. It plays fairly well, but is weak on volume. Tuning seems sensitive. This may be due to the mismatched output test transformer.

Now, I havent been able to find any schematic in riders for this, so I dont know if this was an odd one run make or was bought out by another company. The model number is 105212 as far as I can tell. I am having to use my instincts on this one, but any help would be appreciated as far as a diagram, experience, or history. 

The 6F6G output tube appears to need a transformer with a 7000 ohm or so plate load according to the RCA tube manual. Judging from the size of the speaker (about 12"), I am guessing the trans to need to be about a 5w. It has around 200v on the plate. I have no idea what the impedence of the speaker is. It does work, but again, very weak. 

Here are a few pictures of things before I started the recap:
   
   
   
   
More to come...

If I could find the place called "Somewhere", I could find "Anything" Icon_confused

Tim

Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44


Messages In This Thread
Parmak rebuild (Parker McCrory) - by TV MAN - 01-29-2018, 04:34 PM
RE: Parmak rebuild (Parker McCrory) - by TV MAN - 01-29-2018, 04:53 PM
RE: Parmak rebuild (Parker McCrory) - by TV MAN - 01-29-2018, 06:26 PM
RE: Parmak rebuild (Parker McCrory) - by Arran - 01-30-2018, 05:56 AM
RE: Parmak rebuild (Parker McCrory) - by TV MAN - 01-30-2018, 11:34 AM
RE: Parmak rebuild (Parker McCrory) - by Arran - 01-31-2018, 01:14 AM
RE: Parmak rebuild (Parker McCrory) - by Arran - 02-01-2018, 02:36 AM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Need to purchase some accessories for restoration of my Old Philco Radio
Hi Paulo, Welcome to the Philco Phorum. I can see why you want to find good reproduction parts. That is a bea...MrFixr55 — 11:10 PM
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM
Philco 610B oscillator wiring
> The cathode as noted is wired directly to the ground side of the heater filament for that tube, not to the #17 and ...Radioroslyn — 08:12 PM
HiFi (Chifi) tube amp build - but my own design.
Tim; I noticed your post a little late, but I would take one of the junk sockets and try to break a chunk out of it wi...Arran — 08:07 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM

[-]
Who's Online
There are currently no members online.

>