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

Model 71 code 225 shadow meter
#1

Hi everyone, I have a 71 cathedral with a code 225 chassis. I figured out  (after a while) that code 225 should mean two speakers, this is a cathedral though and the K 7 speaker had separate pins soldered to the three  wires and plugged in the 4 pin socket on the chassis. Was a 2 speaker chassis (221, 223 or 225) chassis ever used in a cathedral cabinet? If so then was a K 7 speaker with a plug used for the attachment? I am guessing all 2 speaker chassis used the 4 pin socket instead of being "hardwired". My main question relates to the shadow meter though, the coil is open. To bypass this , should I solder a resistor across the terminals on the strip on top of  the #8 choke? I replaced the electrolytic caps and am working on the bakelite blocks, the audio section is working after figuring out  the loose speaker pin arrangement. The cabinet is really nice so I want to finish this project. The 71-225 chassis does not match the schematic for a 71-221 and it has the separate tube shields . Any comments and help with bypassing the shadow meter are welcome.
I have a 71-123 chassis with replaced caps and  transferred non working shadow meter in the pristine cabinet right now.

Bob..
#2

The shadow meter was attached to the terminals on the strip bolted to the top of choke #8 (described as A and B ) in the instructions for installing a shadow tuning meter in model 71. I am going to try soldering a 1000 ohm resistor to those terminals. The instructions I just mentioned stated that some of the later 71 models had a short piece of wire connecting A and B which only required removal and replacement with the new shadow meter wires. How could the shadow meter coil replace a short piece of wire?
#3

Hi Bob,
You can solder a 1k resistor across the open coil or I would suspect you could just solder a jumper across it also. Depending on what style sm you have, some are not too difficult to rewind and make functional again.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry




Users browsing this thread:
[-]
Recent Posts
An attempt to remove the Field Coil from a G speaker
Paul, thanks, Anything can help. Gary Thanks, lemme look! PS. Looked it up. They have kits and parts for mod...morzh — 02:45 PM
An attempt to remove the Field Coil from a G speaker
Paul, thanks, Anything can help. Gary Thanks, lemme look!morzh — 02:39 PM
46-1201 Trip Switch Spring
I deleted the other thread, as it was duplicate and did not have the photo. Please proceed with this one.morzh — 02:37 PM
46-1201 Trip Switch Spring
Hello, first post here, bear with me. I've been electronically refurbishing a 46-1201 that I received from a relative. ...ConcernedFeller — 01:46 PM
An attempt to remove the Field Coil from a G speaker
I am late to this post, amazing amount of work for a speaker Mike. You must like the challenge. I have a speaker from an...Paul Philco322 — 01:04 PM
An attempt to remove the Field Coil from a G speaker
Mike, give this site a look for your spider. Can't hurt. Take care and BE HEALTHY! -GaryGarySP — 12:41 PM
An attempt to remove the Field Coil from a G speaker
Rod, Bubble packaging? The one I know (if you mean the large bubble type) is really thin. I have some at home. Is there...morzh — 12:23 PM
An attempt to remove the Field Coil from a G speaker
Q8. What's the meaning of life? I have read that someone made a spider out of the clear plastic from bubble packagin...RodB — 11:07 AM
An attempt to remove the Field Coil from a G speaker
So, Q1. Does anyone know where to get the spider. Q2. If there is no such place, what material is best? I doubt tin is...morzh — 09:43 PM
An attempt to remove the Field Coil from a G speaker
Arran The oxidation seems to go deep, a few layers. The break starts right there, but then it will occur on every la...morzh — 07:35 PM

[-]
Who's Online
There are currently 8568 online users. [Complete List]
» 1 Member(s) | 8567 Guest(s)
Avatar

>