Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
If anyone is interested, I just posted a pictorial of this much despised chassis being rebuilt on my blog:
http://www.russoldradios.com/blog
Most people hate it. Not because it works poorly but because it is very difficult to work on. I have done several of these since they were used with a few changes for 2 years in many RCA and GE (Westinghouse?) radios. The same chassis was used in consoles and table models with the same speaker. There were also 7 and 9 tube versions.
Russ
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 1,475
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
Very nice job Russ.  That is a fine looking cabinet also.
I almost bought one similar awhile back but was out bid at the local club auction. Good to see what all is involved if ever I get one.
Posts: 3,148
Threads: 56
Joined: Apr 2011
City: Lexington, KY
Nice job Russ! Those tips will come in handy when I finally tackle a G.E. J100 cathedral I've been putting off for years.
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"
Posts: 5,159
Threads: 273
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Posts: 4,429
Threads: 418
Joined: Jun 2011
City: Boston
State, Province, Country: Massachusetts
With the tuning condensor underneath it is busy under there, many of those RCA are toughies, RCA 28P is loved and hated too.
Nice work kid.
Paul
Tubetalk1
Posts: 4,856
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
They aren't that bad, I've worked on a couple of these, and will work on a couple more that are in the restoration docket. One was a C.G.E J-82 and the other a Canadian Westinghouse 801 Columaire which uses similar circuitry and components but in a Westinghouse built chassis, the next two will be another J-82, and an S-42A. The biggest nuisance isn't the tuning condenser it's the IF cans and the oscillator coil, which you may or may not have to remove to get at some things. These sets are good performers though, which probably explains why there are so many survivors as they were probably good sellers.
Regards
Arran
(This post was last modified: 07-16-2016, 04:23 AM by Arran.)
Posts: 157
Threads: 12
Joined: Dec 2012
City: Seattle, WA
Wow Russ, hard to believe that's the same radio!
What's your take on casting 2W resistors into dogbone molds? Are they still able to dissipate 2W, or are they derated a bit?
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
(07-16-2016, 04:28 AM)palegreenthumb Wrote: Wow Russ, hard to believe that's the same radio!
What's your take on casting 2W resistors into dogbone molds? Are they still able to dissipate 2W, or are they derated a bit?
I have been doing this for years now. I have only had one get hot enough to damage the molded material and it was the result of another failure. The idea is that you replace a 1/2w with a 2W or larger to better dissipate any heating, most of which leaves by way of the leads anyway.
But, yes. I would not run them at 2w. I have used 3.8w wire-wound when I thought heat would be a problem. This increases the cost by about 10X. These resistors (the ww) are the same size as a 2w metal (blue) so are sized to cast into a 1/2w dogbone or larger.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
(07-16-2016, 04:22 AM)Arran Wrote: They aren't that bad, I've worked on a couple of these, and will work on a couple more that are in the restoration docket. One was a C.G.E J-82 and the other a Canadian Westinghouse 801 Columaire which uses similar circuitry and components but in a Westinghouse built chassis, the next two will be another J-82, and an S-42A. The biggest nuisance isn't the tuning condenser it's the IF cans and the oscillator coil, which you may or may not have to remove to get at some things. These sets are good performers though, which probably explains why there are so many survivors as they were probably good sellers.
Regards
Arran
Removing the tuning cap allows access to the IF cans. One IF can cap can be removed by slightly distorting the front and back flanges of the chassis to get it past the coil. This also allows access to the tabs at the base of the cap can which must be bent to remove the can.
Another tip: When removing the cap can also remove or loosen the mount for the ceramic padder cap or you will break it with one of the tabs.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
(This post was last modified: 07-16-2016, 11:04 AM by Phlogiston.)
Posts: 4,856
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
Russ;
Just a thought on that wire wound that's on the resistor board, I looked up the set and found out that there was a 3 Watt carbon resistor in that position according to the parts list. It may have been replaced by a service man or it may have been a production change since it looks like they shrouded it in fish paper, either way putting a 5 Watt wire wound in it's place was a smart move.
Regards
Arran
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
(07-18-2016, 03:13 AM)Arran Wrote: Russ;
Just a thought on that wire wound that's on the resistor board, I looked up the set and found out that there was a 3 Watt carbon resistor in that position according to the parts list. It may have been replaced by a service man or it may have been a production change since it looks like they shrouded it in fish paper, either way putting a 5 Watt wire wound in it's place was a smart move.
Regards
Arran
Yes, I believe all of that is true. The fish paper is factory installed.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Users browsing this thread: 2 Guest(s)
|
|
Recent Posts
|
|
Philco 42-345 Restoration/Repair
|
| Ah Ok I've taken the spring off and removed the broken piece, looks like I would lose about an inch using the current ca...osanders0311 — 08:21 PM |
|
Philco 42-345 Restoration/Repair
|
| The string is held tight with springs. I use black 20 pound test nylon fishing line (plentiful here in MN). Take picture...RodB — 07:15 PM |
|
Philco 42-345 Restoration/Repair
|
| Thank you very much for your help and sending the pictures, the cables must have been wrapped very tight around the spin...osanders0311 — 06:52 PM |
|
Philco 42-345 Restoration/Repair
|
| As you can see, mine has a chunk of hard rubber remnant on the shaft next to the chassis. I would say the shaft was, at ...RodB — 06:13 PM |
|
VTVM meter moves when my hand is next to it & not on
|
| It's okay because my wife hoards yarn, so one more piece of radio rest equipment is ok tooBruce B — 05:56 PM |
|
Philco 42-345 Restoration/Repair
|
| I think my 42-340 is the same as your 345 without the buttons. Give me a few minutes and I'll pull the chassis and I'll ...RodB — 05:43 PM |
|
VTVM meter moves when my hand is next to it & not on
|
| Can't turn that deal down.RodB — 05:23 PM |
|
VTVM meter moves when my hand is next to it & not on
|
| Thanks Bob,
I was kinda figuring on that, but I have never seen anything like this guy does. It's inability to come ba...Bruce B — 04:59 PM |
|
Philco 42-345 Restoration/Repair
|
| I have attached a markup of the channel selector cable upper right in the picture under the chassis, this cable is broke...osanders0311 — 04:40 PM |
|
VTVM meter moves when my hand is next to it & not on
|
| That's static electricity. Take a used fabric softener dryer sheet and wipe the dial cover then discharge your body to t...RodB — 04:39 PM |
|
Who's Online
|
There are currently 2288 online users. [Complete List]
» 1 Member(s) | 2287 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
