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: 15,527
Threads: 545
Joined: Oct 2011
City: Jackson, 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, 02:01 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: 15,527
Threads: 545
Joined: Oct 2011
City: Jackson, 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: 7,273
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: 15,527
Threads: 545
Joined: Oct 2011
City: Jackson, 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.
(This post was last modified: 07-01-2015, 03:46 PM by morzh.)
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: 7,273
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, 07:37 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, 09:16 AM by Jim Koehler.)
Users browsing this thread:
|
|
Recent Posts
|
|
Correct model 84 Ac plug an cord type
|
| From what I read Philco went to using brown rubber power cords in 1936, so cloth was used in the 1935 and earlier models...Arran — 11:25 PM |
|
Correct model 84 Ac plug an cord type
|
| Hi Bruce,
I have not worked on an 84, but in general, power cords for almost any radio prior to 1938 was cloth covered...MrFixr55 — 08:34 PM |
|
Restoring Philco 38-14
|
| OK, well, so after staring at the sch again, I realized the problem had to be the #12/12A padder.
I put a scope on the o...morzh — 08:15 PM |
|
Correct model 84 Ac plug an cord type
|
| Hello Bruce,
I mostly use brown far as my cloth powercords go !
Here is the plug that I have used bakelite Acorn style...radiorich — 08:05 PM |
|
Correct model 84 Ac plug an cord type
|
| Looking for as correct as can find the right Ac plug an the correct colored cloth line. Ive seen many old photos but mos...Bruce — 04:13 PM |
|
Restoring Philco 38-14
|
| Rod
Two Y-caps make sense if you use them from L/N to the chassis; this is only makes sense in the transformer radios...morzh — 10:11 AM |
|
Restoring Philco 38-14
|
| Mike, I'm curious about a specific use of he Y cap. Lately I've seen a single cap across the power transformer primary. ...RodB — 09:01 AM |
|
Restoring Philco 38-14
|
| hello morzh ,
That sounds like a plan !
Sincerely Richardradiorich — 07:45 AM |
|
Restoring Philco 38-14
|
| Richard,
It helped some, but I still had the whining when engaging the rear power strip (I did not realize it was fro...morzh — 07:07 AM |
|
Restoring Philco 38-14
|
| Hello morzh,
Yes , that dreaded hum in my room where i do alighment I have my cable modem and router plus desktop plus ...radiorich — 11:25 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
