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

Threaded Mode
Philco 90 (Early) Speaker Diagram
Nathan Slingerland
Super Moderator
******
Posts: 1,874
Threads: 212
Joined: May 2015
City: Seattle State, Province, Country: WA
#1

11-08-2015, 06:26 PM
For reference, attached is the wiring diagram for the early Philco 90 with push-pull 45 output tubes:

.pdf Philco 90 Early - Speaker Diagram.pdf Size: 72.02 KB  Downloads: 175


The page in the tech section on Philco 20/70/90 speakers is very helpful but only has the diagram for the single-ended output versions:

http://www.philcoradio.com/tech/speaker.htm

The wiring on my 90 was pretty mangled, so it took a bit of tracing of the schematic to figure it out.
Find
« Next Oldest | Next Newest »




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 60 Squealing
Wavetrap no longer matters.morzh — 05:19 PM
Philco 60 Squealing
Rod, I had checked out your suggestions but did not help. I did solder the ground rivets to the chassis as Chas suggeste...dconant — 04:52 PM
37-690 Bass Choke Replacement
Yeah, I know, Mouser and Digikey don't have "big iron" components. For some reason Philco was messing with the...Radiodial — 04:25 PM
37-690 Bass Choke Replacement
Yes, I just had to deal with that while repairing the 37-604 Philco. Exactly that value choke was gone. And the current ...morzh — 03:52 PM
37-690 Bass Choke Replacement
Ah, now where to find one. I've into this before on smaller sets, I now recall. Hammond makes one that is only rated...Radiodial — 03:27 PM
Philco 38-7 Speaker
Ask the admins to put them together. As for the renaming, while inside the thread, you simply press "New reply&quo...morzh — 02:23 PM
37-690 Bass Choke Replacement
This is the parts catalog. 32-7528 choke is 65H, 10mA, 2,250 Ohm inductance. Find a suitable one.morzh — 02:18 PM
37-690 Bass Choke Replacement
While troubleshooting the no bass amplification issue, I think I found the culprit. The choke #104 is reading 164K ohms....Radiodial — 01:42 PM
Philco 60 Squealing
Your IF transformers are tuned to the resonant frequency they were designed for. When you observe the bell curve they di...RodB — 01:35 PM
identify very thin wire for replacement on 37-640
Thanks so much for your help!  I really could not have gotten this far without the kindness of you and other members.  T...georgetownjohn — 11:50 AM

[-]
Who's Online
There are currently 3151 online users. [Complete List]
» 2 Member(s) | 3149 Guest(s)
AvatarAvatar

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