Posts: 1,193
Threads: 83
Joined: Jan 2014
City: Annapolis, IL
State, Province, Country: USA
I just picked up a 50's model Philco tv, not sure of the year or model yet. It was a barn find. Shame. But, I did save it from the dumpster! It had been out there just long enough to damage the bottom of the cabinet, grill cloth and put a little very light surface rust on some things. Set is complete, and had been purchased new by this family. I guess it was put out shortly before the owner died. I took a look inside so see how much rust or rodent damage was present (thought of it for parts at 1st) but things didn't look too bad. I may take a shot at a rebuild a little later. It is a split chassis, but looks much simpler than another Philco I have. This one has the 2 large selenium rectifiers instead of the 5U4. I wondered what it takes to replace those. Thought of a couple 2.5a diodes stacked (paralleled). Anyone done this?
Anyone restored a blonde cabinet before? Other then some loose veneer at the bottom and some inside structure/supports needing replaced, the cabinet is intact. I don't know if this type of finish can be duplicated. This could be very neat old tv. I'll try to post some pics down the road when I get my 'shop' ready - still a work in progress...
If I could find the place called "Somewhere", I could find "Anything" 
Tim
Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44
(This post was last modified: 06-20-2015, 11:34 AM by TV MAN.)
Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
I've used a couple of 1N5408's in a few tv's I've serviced. Worked fine.
GL
Terry
Posts: 1,231
Threads: 29
Joined: Jan 2014
City: Wellborn Florida
IN5408 3AMP/1000PIV cost around 35 cents each, IN5406 #AMP/600PIV cost around 25 cents each. When I installed diodes I will do series just in case one fails. So if you do series and paralled cost is no more than a couple of bucks. Look forward to seeing the finished project. David
Posts: 4,806
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
(06-21-2015, 07:07 PM)David Wrote: IN5408 3AMP/1000PIV cost around 35 cents each, IN5406 #AMP/600PIV cost around 25 cents each. When I installed diodes I will do series just in case one fails. So if you do series and paralled cost is no more than a couple of bucks. Look forward to seeing the finished project. David
They are even cheaper then that if you buy some off of Mouser, I think that they were around $.15 each through there, so even less of an excuse not to double up on them. The reason I investigated was for the diode dropper trick in early AC/DC radios and series string TVs, much cheaper to buy an extra diode then a new set of tubes if one shorts out.
Regards
Arran
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
Agree, diodes will be fine, mind you ALL the electrolytics and, yes, all the paper caps must be replaced before you dare turn it on. Might want to find out if the CRT is good first.
You'll get more on blond cabinet refurbishing by making another post in cabinets forum. Been a whle but I recall stripping, staining a darker color on a couple of 50's TV Cabinets.
Posts: 1,193
Threads: 83
Joined: Jan 2014
City: Annapolis, IL
State, Province, Country: USA
Thanks for the replies! I am curious about the diode dropper trick. Any info on that would be appreciated. I had never thought of putting diodes in series like that. I could see that saving problems if one shorts. Do these need any kind of dropping resistor added?
If I could find the place called "Somewhere", I could find "Anything"
Tim
Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44
Posts: 1,231
Threads: 29
Joined: Jan 2014
City: Wellborn Florida
Good Morning you will need some kind of dropping resistor. Old selenium rectifiers drop around 7-10 volts in a radio silicon diodes drop 7/10 of a volt in a radio!!! Desired voltage drop divided by amps equals ohms, go with your best guess then measure results and adjust. Good Luck David
Posts: 77
Threads: 24
Joined: Nov 2010
City: Oradell, NJ
There's a complication in calculating the resistance you'd need. The diode will only be passing current at the peaks of the 60Hz waveform. That's when the filter cap is "topped off" (I'm not talking about initial power up). These spikes of current are about ten times the B+ supply current the tubes are pulling. Again it's a best guess, and adjust accordingly.
Posts: 464
Threads: 31
Joined: Sep 2009
City: Lapeer
State, Province, Country: MI
Hi Tim, check out the link:
www.w3hwj.com/index_files/RBSelenium2.pdf
Replacing Selenium Rectifiers Further Thoughts Six Years Later Since the Antique Wireless Association published my article in January of 2007.
Rich Bonkowski does a great job explaining. Joe
Joe
Matthew 16:26 "For what does it profit a man if he gain the whole world, yet lose his own soul?"
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Philco 91 Restore Code ??
|
| No, that cannot be the 47.
The 47 is a regular backelite block cap. Look at the chassis picture, it is shown there. Rig...morzh — 01:45 PM |
|
Philco 91 Restore Code ??
|
| I have changed the title of this thread from Philco 91 Schematic.
I have gone through most of the cap replacements. I...dconant — 01:26 PM |
|
462ron
|
| Here is an online transistor substitution site…
Ron462ron — 08:44 AM |
|
1930s Stewart-Warner Tombstone Radio need help identifying model number
|
|
One way to repair a broken wire on a coil is to take a copper strand out of some 18 gauge electrical cord, make a &quo...captainclock1988 — 12:55 AM |
|
B&K 1077B no video
|
| Hello Tim,
I once had a Jcpenny 13inch tv /monitor built by NEC come into my repairshop it would start acting up at tim...radiorich — 10:59 PM |
|
Restoring Philco 96
|
| Mike;
The last time I took a potted condenser can apart, and it was maybe 1/4 the size of the one in the model 96, I ...Arran — 10:56 PM |
|
Compatible crts
|
| Bob Andersen — 08:58 PM |
|
1930s Stewart-Warner Tombstone Radio need help identifying model number
|
| One way to repair a broken wire on a coil is to take a copper strand out of some 18 gauge electrical cord, make a "...Arran — 08:41 PM |
|
Restoring Philco 96
|
| Have just aligned it. Surprisingly, it was not that much off at all. Barely.
Aligning TRF sets is pure pleasue, as ther...morzh — 07:52 PM |
|
6TPZ and 5TPO Radio Help
|
| 1 - 0v - correct
2 - 0v - correct
3 - 0v - --------------------- both 3 and 4 should be the same. Check L2 for being ope...morzh — 05:15 PM |
|
Who's Online
|
There are currently 5357 online users. [Complete List]
» 1 Member(s) | 5356 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
