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

38-690 Tweeter Temperature
#2

I'm not sure if you know this, and it may or may not be related to this possible issue you are seeing...but the tweeters were wired "out of phase" or backwards on most sets from the factory. Changing this makes the tweeters work much better, and increases the high notes. And maybe it will "correct" the voltage difference? Not sure...

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


Messages In This Thread
38-690 Tweeter Temperature - by RGK20m3 - 04-21-2022, 08:14 AM
RE: 38-690 Tweeter Temperature - by Brad Winder - 04-21-2022, 09:39 AM
RE: 38-690 Tweeter Temperature - by Ron Ramirez - 04-21-2022, 09:41 AM
RE: 38-690 Tweeter Temperature - by RGK20m3 - 04-21-2022, 09:47 AM
RE: 38-690 Tweeter Temperature - by morzh - 04-21-2022, 02:25 PM
RE: 38-690 Tweeter Temperature - by RGK20m3 - 04-21-2022, 03:35 PM
RE: 38-690 Tweeter Temperature - by Brad Winder - 04-22-2022, 12:11 AM
RE: 38-690 Tweeter Temperature - by RGK20m3 - 04-22-2022, 04:48 PM
RE: 38-690 Tweeter Temperature - by RickC - 11-23-2023, 03:46 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
12' Philco
If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel. Kareem would have an e...morzh — 01:48 PM
12' Philco
And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM
Hickok AC51 tube tester
I think they have only shown the secondaries of the transformer. Two of them feed the rectifiers' filaments.morzh — 12:58 PM
IF can wire size and Rubber mounts?
Arran If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM
12' Philco
Rod, Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently. H...morzh — 12:54 PM
Hickok AC51 tube tester
Absolutely no one is going to reverse engineer that circuit. Even the iron core is missing.RodB — 10:37 AM
IF can wire size and Rubber mounts?
Thanks to both members for your help regarding wire and tuner mtg supports. regards--Johngeorgetownjohn — 09:33 AM
Hickok AC51 tube tester
Note that no power cord, power switch, or power transformer switch are shown. That (along with my experience with full s...DaleHCook — 07:09 AM
IF can wire size and Rubber mounts?
A pair of wire strippers can give you an idea of what the existing gauge of the wire leads are in the IF can, I think it...Arran — 06:07 AM
My last cabinet for this year
Hello Dan, That is really beautiful what great looking radio you have ! I have friends who live in Calgary and the wea...radiorich — 01:51 AM

[-]
Who's Online
There are currently 4454 online users. [Complete List]
» 2 Member(s) | 4452 Guest(s)
AvatarAvatar

>