Posts: 44
Threads: 4
Joined: Dec 2013
City: Freeport, LI, NY
Hi Guys......
On the bench is a model 96 and I'm having a few issues....
Is there a list for the resistor values? Other than part numbers and Bintliff's Philco Cap Guide Pt. II, I was just wondering if a Philco list can be found.
Can someone furnish me with the resistance value of the field coil? Mine's reading about 2,200 ohms DC. On a test, I had 334 VDC going into the FC and 150 VDC coming out. It should be about 225 VDC. Monitoring the amp draw of the radio, it's around 800 ma. I think this coil is shorted but knowing the actual resistance value would be a big help. (the cap can (p/n 3754) has been recapped and works fine.
Tnx...
...Jim
Posts: 16,259
Threads: 566
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Go to the sch section here at Philcoradio, open 96 sch, it has all resistors.
2,200 ohm looks right, also the values of field coils are not likely to change, it is either right value, or open, rarely short.
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: 44
Threads: 4
Joined: Dec 2013
City: Freeport, LI, NY
(07-01-2015, 03:01 PM)morzh Wrote: Go to the sch section here at Philcoradio, open 96 sch, it has all resistors.
2,200 ohm looks right, also the values of field coils are not likely to change, it is either right value, or open, rarely short.
Where's the schematic section?
Posts: 16,259
Threads: 566
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
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: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
When I look at the diagram the output of the p/s goes into the FC then the other side of the FC goes to #45 to ground. I think what you are seeing is the voltage drop across the FC+#45. That not to say that you could have a bad filter cap or any of the bypass caps w/the resistors inside. Always use mylar cap to replace the filters
Terry
Posts: 16,259
Threads: 566
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Jim
1. A shorted coil would give you MORE voltage at the output, not less.
2. A shorted coil would not be 2,200 Ohms.
3. What you have is an excessive draw by the load. Have you recapped your radio? What else have you checked so far?
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: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
Agree, if there was any intermittant in field coil to frame (which is probably ground potential,) could draw current. Check the coil out of circuit to probably prove innocent or otherwise.
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
The original Philco speaker field was 3,200 ohms.
--
Ron Ramirez
Ferdinand IN
Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
Don't think the spkr frame is at ground potential. Just has 4 wires for the FC and OPT. This mounted to the wood cabinet. Did you measure the FC resistance with the spkr unplugged from the chassis?
Terry
(This post was last modified: 07-01-2015, 08:37 PM by Radioroslyn.)
Posts: 44
Threads: 4
Joined: Dec 2013
City: Freeport, LI, NY
Hi Guys...
Ron's number seems to prove out that the FC is shorted. I'm reading 2,200 ohms DC. Together with the open primary on the OPT, the main problem is right here. The FC can be taken out of the speaker fairly easily so I think I'll rewind it.
Anyone know of a rewinding shop on the East Coast?....or have another Model 96 speaker they can spare?
Again Tnx....
...Jim
(This post was last modified: 07-02-2015, 10:16 AM by Jim Koehler.)
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
An attempt to remove the Field Coil from a G speaker
|
| Hi Morzh,
May be a good idea to remove the cone to prevent damage. You may have to do so anyway to remove the pole ...MrFixr55 — 08:44 PM |
|
Philco 91 Restore Code ??
|
| I think that Danaher, the company that owns Beckman-Coulter (the company that I worked for 41 years) owns Fluke. They a...MrFixr55 — 08:35 PM |
|
Philco 91 Restore Code ??
|
| Rod
I wish... :lol:
I am not sure I'd buy the Fluke, had it not fell in my lap for free. $500 to $800...it's a lot...morzh — 08:09 PM |
|
Philco 91 Restore Code ??
|
| Mike, ...you get a commission?RodB — 07:52 PM |
|
New member
|
| Hi. I specialize in refurbishing Predictas, but I'm in Chicago. If you can get it to me, I'd be happy to go over it. ...Bob Andersen — 06:43 PM |
|
An attempt to remove the Field Coil from a G speaker
|
| I have 3 G speaker, all with open Field coils.
Today I pull one of the shelf and decided to try to remove the FC (spo...morzh — 06:07 PM |
|
Philco 91 Restore Code ??
|
| Thanks Mike. I will check them out.dconant — 05:52 PM |
|
Philco 91 Restore Code ??
|
| There is no such thing as bad Fluke.
This said, they are expensive. A Fluke is easily 10x the price of comparable CCC...morzh — 05:45 PM |
|
Philco 91 Restore Code ??
|
| Hello Mike,
Yes, I have 3 Fluke meters one being my first Fluke 77 and other being Fluke 87.
My third is Fluke clamp -...radiorich — 05:04 PM |
|
Philco 91 Restore Code ??
|
| I knew that Fluke was the Cadillac so with that in mind what Fluke would you recommend I get?dconant — 03:53 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
