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

Model 84, code 121 question(s)
#1

Found a nice, unmolested example of the 1934 cabinet design at the WARCI meet Sunday, and have a few questions with regards to the electronic restoration. First, for reference, here's a link to the PDF file schematic from Nostalgia Air. I've ordered "good" copies from Chuck: http://www.nostalgiaair.org/PagesByModel...013875.pdf

My first concern is this wire that is either cut or more likely broken off. It's attached to the OSC coil (I pointed to the lead the end of the wire is soldered to) You can see the broken end in the upper right hand corner of the pic:
   

Here is the broken off end, which appears MAY have come from the off/on/volume control? :
   

Here is a full view of the bottom of the chassis, pointing to the broken wire:
   

I'm hoping this set won't have the same OSC coil nightmares as the model 89's do. As with that set, if anyone has any info on the 84 as far as which terminals on the coil are the primary and secondary windings and (hopefully I won't need it) the number of turns of wire for each and direction to wind?

The other question concerns the electrolytic can containing an 8 mfd and a 10 mfd:
   
It appears to me that the terminal on top directly under the large resistor is the ground. There's green paint next to the terminal. Is that correct? Also, it appears to be a 'floating ground', as it's only grounded within the can itself, and not on the chassis (as there is a cardboard ring around the outside of the can). Is that the true ground, where everything on that terminal would be connected to the negative end of the replacement electrolytics?

Sorry for the dumb questions. Until I get a better, readable schematic, I'm at a loss, but I know there are some very knowledgeable and helpful Phorum members who I'm sure have tackled one of these small cathedrals at some point. Thanks!

Greg V.
West Bend, WI
Member WARCI.org


Messages In This Thread
Model 84, code 121 question(s) - by NostalgiaRadioTime - 06-03-2014, 07:40 PM
RE: Model 84, code 121 question(s) - by morzh - 06-03-2014, 08:47 PM
RE: Model 84, code 121 question(s) - by morzh - 06-03-2014, 10:05 PM
RE: Model 84, code 121 question(s) - by morzh - 06-04-2014, 08:58 AM
RE: Model 84, code 121 question(s) - by morzh - 06-04-2014, 01:33 PM



Users browsing this thread: 4 Guest(s)
[-]
Recent Posts
1930s Stewart-Warner Tombstone Radio need help identifying model number
UPDATE: I was able to pick up a signal generator on the cheap (amazingly enough) on feebay and I did an IF alignment fol...captainclock1988 — 09:53 AM
Philco 91 Schematic
Hi Rod, The resistor connects to pin 4 and the ungrounded side of block 9. From pin 9 of the RF tube to one side of ...dconant — 09:34 AM
Just got a 49-1613 need to know...everything!
I just found your post. I have this exact same model, and have had it since 1985 when I was 15 years old! I performed a ...MuzzcoVW — 09:11 AM
B&K 1077B no video
Hello Tim, I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ? Sincerely Richardradiorich — 01:55 AM
B&K 1077B no video
I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM
RCA 15X
I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM
B&K 1077B no video
Hello Tim, I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!. Sincerely...radiorich — 11:07 PM
RCA 15X
Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM
Philco 91 Schematic
Hi Dan, I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM
6TPZ and 5TPO Radio Help
I suspect it's been repaired before. And I suspect whoever repaired it, wanted to re-use old transistors' pin stubs in o...morzh — 09:24 PM

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

>