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

Speaker replacement question
#2

The PM speaker will require a power resistor to substitute for the field coil. The OEM speaker is also equipped with a hum bucking coil, to use a PM an additional 20% in capacity should be added to the "filter output condenser". Same OEM field coil speaker also has the output transformer for the'42's. Even with a PM speaker the output transformer is required.

You may find the info here helpful to determine the correct output transformer...

http://www.radioremembered.org/outimp.htm

Might also want to check the Push/Pull input transformer that feeds the '42's. That, could have an open winding too.

GL

Chas

Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”


Messages In This Thread
Speaker replacement question - by bobclausen - 11-30-2022, 03:15 PM
RE: Speaker replacement question - by Chas - 11-30-2022, 06:08 PM
RE: Speaker replacement question - by morzh - 11-30-2022, 08:20 PM
RE: Speaker replacement question - by bobclausen - 11-30-2022, 08:39 PM
Bobclausen - by bobclausen - 11-30-2022, 08:50 PM
RE: Speaker replacement question - by morzh - 11-30-2022, 09:30 PM
RE: Speaker replacement question - by Chas - 12-01-2022, 01:36 PM
RE: Speaker replacement question - by bobclausen - 12-01-2022, 06:04 PM
RE: Speaker replacement question - by MrFixr55 - 12-07-2022, 08:27 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM
Delco car radio Peko vibrator converstion issues
How about putting a choke in the power supply? The big cap was likely an attempt to stabilize the DC. Kids who cre...MrFixr55 — 09:19 PM

[-]
Who's Online
There are currently no members online.

>