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 90 No Spkr or Output Transf.
#1

Well, I thought I should start a new thread on this Philco 90 I picked up the other evening with no speaker assembly.

If I can't find a compatible field coil speaker with output transformer I may
just put in a 3K resistor for the coil and then come up with some
universal output transformer.

In simulating the PS circuit in my
Tina Pro simulator it looks like if I just bump up the output cap
value a bit I'll get good low ripple. I'd go with 10 uF max input cap
so as not to stress the 80 Rect. tube too much.

It also appears that I can do even better on ripple if I split the
3K resistor into two 1.5K ones with an extra C in between. May
try that also. Has anyone done this before?

Does anyone have an idea where the best place to get such
a generic audio output transformer might be?

This is the early 90 with 2 x type 45 push pull output tubes.
Philco speaker web page lists it as a K-2 variety speaker assembly
with xfrmr Zpri = 6700 Ohms, Rpri=500 Ohms.

Will post pictures soon I hope!

Herb S.
Ithaca NY


Messages In This Thread
Philco 90 No Spkr or Output Transf. - by hsusmann - 04-16-2014, 04:01 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
462ron
Hi Howard, if memory serves, and many times it doesn’t, I vaguely remember working on a Philco that had that pin you hav...462ron — 09:00 AM
Gloritone 27 Radio
Hello John, Thanks for the information and Arran I have heard of Wells Gardner and I have heard of Apex but I did not ...radiorich — 08:17 AM
Gloritone 27 Radio
Another make I have seen from U.S Radio and Television was Apex Electric, or U.S Apex, the badge on some of those had a ...Arran — 12:56 AM
Philco 46-480 Electronic Restoration
I’ve consulted a couple of the books which I got from Jim Koehler, Elements of Radio Servicing (Marcus and Levy, 1947) a...jrblasde — 10:58 PM
Gloritone 27 Radio
Richard, Radiotrope was one of the many nameplates coming out of the Marion, Indiana U.S. Radio and Television Corp plan...Eliot Ness — 10:12 PM
[split] New member...
Oh... That link is gold man! Thank you so much. I'll see if I can get this thing fixed and will post the results on...HowardWoodard — 08:10 PM
[split] New member...
Gosh. I always re-discovered how to do it, took me 2-3 minutes every time. Now that I think of it, the c-clip is there b...morzh — 07:17 PM
38-690 Gill Cloth
Yeah, this one is not a chevron pattern. Ask Mike Katz, if he has something that is similar.morzh — 07:02 PM
38-690 Gill Cloth
Hi Folks, Is anyone currently selling a good reproduction of the 38-890 grill cloth? Thanks Stevetargeteye — 06:57 PM
[split] New member...
@morzh: As you can see from the pics I included, there is no clip where the vernier shaft comes out of the brass coarse ...HowardWoodard — 06:56 PM

[-]
Who's Online
There are currently 2501 online users. [Complete List]
» 3 Member(s) | 2498 Guest(s)
AvatarAvatarAvatar

>