Model 71 code 225 shadow meter - Printable Version
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Model 71 code 225 shadow meter - grandntl - 08-26-2017
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..
RE: Model 71 code 225 shadow meter - grandntl - 08-27-2017
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?
RE: Model 71 code 225 shadow meter - Radioroslyn - 08-27-2017
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.