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: 15,825
Threads: 554
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, 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: 15,825
Threads: 554
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: 7,286
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: 15,825
Threads: 554
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, 04:46 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: 7,286
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
|
|
Philco 60 Squealing
|
| I seem to remember eliminating a squeal by changing the IF frequency by a few KHz. Not that you should put too much tru...fenbach — 08:48 PM |
|
Philco 42-390, code 121 speaker
|
| These speakers pop up on eBay regularly, even if at bloated prices.
Honestly, have not seen many parts on swapmeets.morzh — 08:38 PM |
|
Philco 38-7 Speaker
|
| The put-put is not like the speaker problem.morzh — 08:29 PM |
|
Mission Bell Model 19A Car Radio
|
| Hello everyone,
As mentioned in my last post I was going to see if the vibrator / rectifier section could be persuaded...Antipodal — 08:21 PM |
|
Philco 60 Squealing
|
|
Wondering if I did it backwards.
If a coil was wound backwards, the oscillator would not work at all.
Old school...Chas — 07:23 PM |
|
Philco 38-7 Speaker
|
| 4-ohm speaker. Black, Green leads.tludka — 07:00 PM |
|
Philco 42-390, code 121 speaker
|
| #87 on the schematic.
This radio had a 8" Zenith speaker attached to it when I got it. I do don't know the hist...Stevelog — 06:39 PM |
|
Philco 60 Squealing
|
| I'm pretty sure I now have the litz wire soldered. This did not make any difference. Back in April I rewound the seconda...dconant — 06:25 PM |
|
Philco 38-7 Speaker
|
| Just to make sure, you chose either 4 ohm into 5K or into 10K? (blk-org or blk-grn)morzh — 06:23 PM |
|
Philco 38-7 Speaker
|
| I have let this one sit because of other duties. Now I am back, and I have a couple of questions. I hooked up a Hammond ...tludka — 05:34 PM |
|
Who's Online
|
There are currently 4824 online users. [Complete List]
» 1 Member(s) | 4823 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
