Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 41-608 Clarify neg lead on cap #21A
#1

Hi,

Ron, referring to my first post and the reply you gave to help me out with several questions, I still need clarification on cap 21A & 21B.
My schematic shows the negative lead of 21A is connected to the junction on the resistor bar (#77) where the values of 26 ohm and 28 ohm meet.
The other end of the 26 ohm is connected to chassis ground. So it seems it is slightly above ground. Not being picky... just to be sure what you meant.

Anyway you were saying that this negative lead on 21A is tied directly to ground.

"But the negative lead of electrolytic 21A DOES connect to ground. "

Also on my schematic, as you said, the negative lead of 21B connects to
B- ..... which shows as the junction, again on resistor bar #77, between
(looks like) the 268 ohm value and the 780 ohm value. Wondering if you
would comment on this. I note that the capacitor that is in there now (not the original) has the single negative lead tied directy to a terminal strip ground leg (riveted to chassis). This makes the result somewhat different than the orginal design.

Thanks for all your time, Ron .... or anyone else having taken the time to wade thru my muddle of words, ha.

Best regards to all Icon_smile
#2

Harlan, Hi. I believe that neg of 21Bgoes to the ctr tap HV secondary and between the 780 ohm and 268 on what is most likely a candohm multy tap resistor. The neg of 21A goes to junction between 28 ohm and 26 ohm on that same resistor and through a 4.7 Meg to grid of 7C6 (1st Audio. What has me puzzled, and I'm sure Ron will know, is 21 (8mfd)
has negative grounded. I say puzzled because most times when an electrolytic cap is designated 21, 21A, 21B, the three caps are in the same can and share a common ground, the can. Here, if the schematic is correct, the 21 cap would have to have an independant ground. RON
HELP PL
#3

Hi Harlan

You are correct - I was wrong. I must have been half asleep when I made that post in error regarding the negative lead of condenser 21A. Icon_redface

I went back and corrected my post in your previous thread on this topic.

Yes, the negative lead of condenser (21A) connects to the junction of the 28 and 26 ohm sections of the Candohm (B-C) resistor (77).

Addendum for PL:

The original condenser (21) would have had three separate positive leads AND three separate negative leads; since all three negative leads connect to different points in the circuit. Of course all three positive leads also connect to three different points...

--
Ron Ramirez
Ferdinand IN
#4

Thaks Ron, that was bothering me. Were the caps in one can? PL




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
B&K 1077B no video
I'm going to get back into it tonight. but I disconnected the 2 main resistors off this supply going to different parts ...TV MAN — 04:04 PM

[-]
Who's Online
There are currently 6105 online users. [Complete List]
» 1 Member(s) | 6104 Guest(s)
Avatar

>