1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Linear Mode
audio woes on the 38-5
Ron Ramirez
Silent Key
*****
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana
#7

01-26-2018, 11:12 PM
In this radio the 6J5 is used as a dual diode - the plate and cathode make up one of the diodes, and the grid and cathode is the other diode. One is used as the set's 2nd detector, the other for AVC. It is normal for the 6J5 plate to read 0 volts (or an extremely low voltage of 1 volt or less, likely less).

Also, a 6J5 has no screen grid, just a control grid. Again, in this application, the voltage will be zero, or very low.

Edit: As for the electrolytics...(64A) and (66) should read a negative voltage to ground (chassis). Ditto the positive lead of (64).
--
Ron Ramirez
Ferdinand IN
Find
« Next Oldest | Next Newest »


Messages In This Thread
audio woes on the 38-5 - by NostalgiaRadioTime - 01-24-2018, 10:30 PM
RE: audio woes on the 38-5 - by morzh - 01-24-2018, 10:56 PM
RE: audio woes on the 38-5 - by Radioroslyn - 01-26-2018, 12:15 PM
RE: audio woes on the 38-5 - by morzh - 01-26-2018, 01:41 PM
RE: audio woes on the 38-5 - by Ron Ramirez - 01-26-2018, 11:12 PM
RE: audio woes on the 38-5 - by Radioroslyn - 01-26-2018, 11:49 PM
RE: audio woes on the 38-5 - by morzh - 01-28-2018, 09:53 AM
RE: audio woes on the 38-5 - by Steve Chambers - 01-28-2018, 10:14 AM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Samlex heavy-Duty bench supply filter question
I suggest sticking with the original values. Depending upon the design if you increase the cap values too much the incre...DaleHCook — 08:55 AM
AC/DC Transformer-less Sets
You’re welcome! I was born in 1995, so this is all second-hand information to me from the industry. I did some research ...jrblasde — 08:38 AM
Samlex heavy-Duty bench supply filter question
Hello Everyone, I have one of my Heavy-duty bench powersuplies made by Samlex it's 13.8 volt dc 20-25 amp supply. What I...radiorich — 11:24 PM
Looking for place to donate unique Philco Philco J-1930 Prototype
It's a Glaser Sears changer which Philco's engineers thought was an upgrade over a VM, but in retrospect I'd prefer the ...jeibner — 10:39 PM
AC/DC Transformer-less Sets
Joseph, Thank you for the confirmation. I knew that there must be more to the Transformer-less AC/DC radios than the ...PeterN — 10:30 PM
AC/DC Transformer-less Sets
Good evening, folks. Power station engineer here! The east coast had pockets of DC-only power well into the twentieth...jrblasde — 10:11 PM
AC/DC Transformer-less Sets
Model 40 does not have a rectifier, so it would be a DC only model. This however does not say anything about using...morzh — 08:01 PM
AC/DC Transformer-less Sets
I was wondering if anyone knows if these AC/DC transformer-less sets were actually used on 110v DC anywhere, and when. ...PeterN — 06:35 PM
Looking for place to donate unique Philco Philco J-1930 Prototype
Given the 1960s vintage, it is likely that the cartridge is ceramic, likely more stable. The changer looks like a Voice...MrFixr55 — 05:03 PM
Jackson 665 j2 schematic request
FIXED!daveone23 — 03:55 PM

[-]
Who's Online
There are currently 5194 online users. [Complete List]
» 2 Member(s) | 5192 Guest(s)
AvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration