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: 1 Guest(s)
[-]
Recent Posts
One irritating little amp - VM 557
Interesting amp, TV Man.  V-M was no Fisher, but it looks that this was a serious attempt at HiFi. I take that the outpu...MrFixr55 — 07:31 AM
The list of my radio & TV collection!
Sorry, these are my old videos, so there are no English subtitles yet. RadioSvit — 06:00 AM
The list of my radio & TV collection!
Yes, MrFixr55. I agree with you, this Galicrafters is structurally very similar to the Zenith Transoceanic H500, as well...RadioSvit — 05:58 AM
The list of my radio & TV collection!
Hi Richard. I really like the Hickok, it is very convenient to use. I have another tube tester - the Soviet L1-3. It is ...RadioSvit — 05:27 AM
The list of my radio & TV collection!
Arran. I completely agree with you. I also noticed that the Canadian consoles General Electric, RCA and De Forest Crosle...RadioSvit — 05:11 AM
Electrolytic restuffing/internals
I don’t have a vise so I had to hold it in my hand. Not optimal but covered up by the hvac tape in the end. I have a few...bridkarl — 11:52 PM
Electrolytic restuffing/internals
Bridkarl A question. For a hacksaw the cut looks a little...jagged. Why?morzh — 11:45 PM
The list of my radio & TV collection!
As usual, an interesting post from you, Peter. This seems to be similar to the RCA 3-BX-671 and the Zenith Transoceanic...MrFixr55 — 11:41 PM
The list of my radio & TV collection!
Hello Peter, Thank you for sharing your new video and looks like your weather is nice their too. it was like 25 Cel...radiorich — 11:05 PM
Electrolytic restuffing/internals
hello bridkarl, I will post some better photos ! Sincerely Richardradiorich — 10:14 PM

[-]
Who's Online
There are currently 2144 online users. [Complete List]
» 3 Member(s) | 2141 Guest(s)
AvatarAvatarAvatar

>