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

Philco 38-15CS
#4

John and Terry - Thank you! I pulled the 41 and R33 and R34 did not get hot. Put 41 back in and and R33 got hot again. Replaced C27 and R33 no longer gets too hot and voltages are getting closer to where they should be - voltage between chassis ground and common negative of C31 is now 14.85 VDC.  Biggest issue now is that 41 tube plate voltage reads 292VDC when it should be 200.  There is non-tunable hum from the speaker now (nothing before).

Everything else is about right - 41 screen voltage is at 226 VDC (should be 220). 84 rectifier cathode is at 290vdc on the nose. 4 uf C30 is at 220vdc and 2 uf is at 196vdc. For C31 between 10uf and 12 uf it read 290VDC and between 12 uf and black (neg) it reads 304 VDC.

What is making that plate voltage on the 41 output run so high?  If there is hum from the speaker, does that mean the output transformer is still ok?  This is a chairside - so the speaker is a S19 - In the below, the new green wire goes to field coil yellow new white to terminal on the output transformer (now I am thinking this may be wrong given my issue with the excessive voltage on 41's plate) and new black to the black from the field coil.  -- Andy


Attached Files Image(s)
   

Andy Sorrell
Palmyra, Virginia


Messages In This Thread
Philco 38-15CS - by AVSorrell - 08-30-2022, 05:47 PM
RE: Philco 38-15CS - by Radioroslyn - 08-30-2022, 07:41 PM
RE: Philco 38-15CS - by MrFixr55 - 08-31-2022, 05:35 PM
RE: Philco 38-15CS - by AVSorrell - 08-31-2022, 07:09 PM
RE: Philco 38-15CS - by Radioroslyn - 08-31-2022, 09:29 PM
RE: Philco 38-15CS - by AVSorrell - 09-01-2022, 08:46 AM
RE: Philco 38-15CS - by Radioroslyn - 09-01-2022, 10:39 PM
RE: Philco 38-15CS - by AVSorrell - 09-02-2022, 05:33 PM
RE: Philco 38-15CS - by MrFixr55 - 09-03-2022, 01:19 PM
RE: Philco 38-15CS - by AVSorrell - 09-05-2022, 09:49 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
trying to identify this wire type
Greetings Phorum members, Hope you can help me identify this type of wire in the photo I have attached.  I am not sure ...georgetownjohn — 01:53 PM
Philco 60 Squealing
All correct shields must be in place, all tubes correct no subs of any kind. Check any soldered, riveted ground conne...Chas — 01:24 PM
Philco 60 Squealing
I have recapped and replaced out of tolerance resistors and so on. Radio plays nicely on fairly strong stations. The pro...dconant — 10:55 AM
Philco 46-420 Code 121 Reception issues
Welcome Eric, I agree with Bob and far as the two main electrolytic filter capacitors did you change them yourself or w...radiorich — 11:43 PM
Philco 46-420 Code 121 Reception issues
You mentioned the Philco manual and going through the check points...just to be sure we're on the same page here's the m...klondike98 — 08:13 PM
Philco 42-1008 conversion kit
Interesting. I haven't seen that before.klondike98 — 07:02 PM
12' Philco
Yes I had looked for it on the web as well some time back and could not find it. I was glad to see it turned up in Ron'...klondike98 — 06:59 PM
Shadow Meter Bulb
Now if you had a set with a tuning light then the bulb type is important to the circuit, some sets used those prior to t...Arran — 04:58 PM
Shadow Meter Bulb
Ok. Thanks for the correction.RossH — 03:09 PM
Model 28L
For 28 you will probably need to buy a Hammond 125CSE. Or any of the series of the power you need, with SE suffix. Then ...morzh — 02:09 PM

[-]
Who's Online
There are currently 5546 online users. [Complete List]
» 1 Member(s) | 5545 Guest(s)
Avatar

>