New Project: 1934 Colonial 662 (corrected model)
Posts: 1,296
Threads: 44
Joined: Nov 2017
City: Menlo Park
State, Province, Country: CA
Lots of work on this set this weekend. First off, to diagnose the oscillator problem. I replaced all the paper caps, and the suspect 50k resistor, and the paper caps. Still no stations, and now there was an LF instability in the whole set as soon as the tuning cap was more than half open, with the set blowing raspberries from the speaker. At the end of the day, I returned to checking wiring and component values from the schematic, and found a broken wire from the converter tube grid circuit to the oscillator section of the tuning cap. OK, something to go on, and a good end to the day.
Today I removed the tuning cap, which was needed anyway, to replace the rubber bushings. I punched these out of some silicone foam, and added new wires to the cap #28 enameled wire, with cloth insulation slipped over it was a close match to the original. With this, I finally had some reception, but still a very unstable receiver. Whistles on stations up to about 100 on the dial, after that raspberries from the speaker, on either band. Eventually I tracked this to a bad solder joint connecting one of my restuffed caps. With that restored, I was able to align the radio and it really pulls in stations. 
Pics tomorrow,
Ed
I don't hold with furniture that talks.
Posts: 1,296
Threads: 44
Joined: Nov 2017
City: Menlo Park
State, Province, Country: CA
A few pics
Fine wires leading to the tuning capacitor stators. Notice the osc section on the left has a broken connection. These had so little spare that the breakage was probably due to the additional movement due to the perished rubber mounting grommets:
New grommets cur from silicone foam rubber:
Tuning cap with new wiring, ready for reinstallation.
Playing some music
I don't hold with furniture that talks.
Posts: 1,128
Threads: 11
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Nice and clean! Looks GR8!!
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
Posts: 1,296
Threads: 44
Joined: Nov 2017
City: Menlo Park
State, Province, Country: CA
This weekend. I found time to restuff the two electrolytic cans. All is still working nicely. The chassis is waiting for a new line cord, still to be delivered, and will get new antenna and earth leads before returning to the cabinet.
Ed
I don't hold with furniture that talks.
Posts: 5,124
Threads: 271
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Looking great!
Posts: 1,296
Threads: 44
Joined: Nov 2017
City: Menlo Park
State, Province, Country: CA
Another one over the finish line. I'm pleased with it and particularly enjoyed working on this radio for some reason I cannot quire explain.
I don't hold with furniture that talks.
Posts: 16,213
Threads: 562
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Cute set.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 1,714
Threads: 110
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Ed,
Nice little set !
Sincerely Richard
Posts: 1,230
Threads: 29
Joined: Jan 2014
City: Wellborn Florida
Great job! Ed
Posts: 1,296
Threads: 44
Joined: Nov 2017
City: Menlo Park
State, Province, Country: CA
Thanks everyone. I appreciate the kind words.
I don't hold with furniture that talks.
Posts: 4,405
Threads: 415
Joined: Jun 2011
City: Boston
State, Province, Country: Massachusetts
She is a beaut. Nice size, maybe I could sneak one that in unoticed!
I think Colonial made a lot of stuff for SEARS if its the same Colonial I am familiar with.
Enjoy.
Paul B
Tubetalk1
Posts: 1,714
Threads: 110
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Paul,
Yes it is the same company and I own a bunch of sears radios made by them also Arvin .
Sincerely Richard
Posts: 4,405
Threads: 415
Joined: Jun 2011
City: Boston
State, Province, Country: Massachusetts
I like that mantle style, thanks for confirming Rich.
Paul
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
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 |
|
B&K 1077B no video
|
| Thanks Rich! I'll take a look and see what he has. I know there's more modern equipment to be had, but this one I know a...TV MAN — 09:11 PM |
|
B&K 1077B no video
|
| Hello Tim,
Here is a link to restoration of one on Phil's old radios site !
Sincerely Richard
bk1077bradiorich — 09:01 PM |
|
6TPZ and 5TPO Radio Help
|
| I'm a little befuddled on this one. Should X5 and X4 be tied together like this? It looks like someone added this at so...R3Sons — 07:33 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
