BigBen volume pot replacement help!

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docs

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Hi all,

Anyone have any idea about what could be used to replace this volume pot?
Another Sanyo box perhaps?
It's a 50k pot.
 

docs

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According to the SM:

Item VR803
Part Number: 4-222T-91700
Description: Variable Resistor 50-B, Main

There are 6 pins.

Screen Shot 2017-09-27 at 12.19.13.png
 

caution

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Oh, I meant a real-life picture of the pot so I can find one that would fit :-)
There has to be more than six connections, I see loudness taps.
 

caution

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That's a different style there, Royce. The 5350 pot looks much like the one for the 5050, or the M90. They have a seventh pin under the left pin. They have separate loudness taps, so there are seven pins:

If you look carefully at docs's pic, there's no seventh pin. His pot has separate pins for common, and the loudness taps are tied together and go somewhere off the page - almost like there's a wire that solders to the top of the pot down into the board somewhere that I can't see. it's weird.

Docs, see if you can post a pic of the pot, and if you see one give me the part number on it, if it looks different than the number you found in the manual.
 

BoomboxLover48

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caution said:
That's a different style there, Royce. The 5350 pot looks much like the one for the 5050, or the M90. They have a seventh pin under the left pin. They have separate loudness taps, so there are seven pins:

If you look carefully at docs's pic, there's no seventh pin. His pot has separate pins for common, and the loudness taps are tied together and go somewhere off the page - almost like there's a wire that solders to the top of the pot down into the board somewhere that I can't see. it's weird.

Docs, see if you can post a pic of the pot, and if you see one give me the part number on it, if it looks different than the number you found in the manual.
That is correct! But I was thinking of a way to make it work. I have 3 tube radios that was not able to fix because of 50K pots......issues. They are expensive Phillips 10 tube radios.... ..

BoomboxLover48 said:
That's a different style there, Royce. The 5350 pot looks much like the one for the 5050, or the M90. They have a seventh pin under the left pin. They have separate loudness taps, so there are seven pins:

If you look carefully at docs's pic, there's no seventh pin. His pot has separate pins for common, and the loudness taps are tied together and go somewhere off the page - almost like there's a wire that solders to the top of the pot down into the board somewhere that I can't see. it's weird.

Docs, see if you can post a pic of the pot, and if you see one give me the part number on it, if it looks different than the number you found in the manual.
That is correct! But I was thinking of a way to make it work. I saw the 7th pin and knew that is out of the ordinary...
I have 3 tube radios those were unable to fix because of 50K pots dimensions and size issues, design..
......issues. They are expensive Phillips 10 tube radios.... ..
 

docs

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Jun 26, 2010
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caution said:
That's a different style there, Royce. The 5350 pot looks much like the one for the 5050, or the M90. They have a seventh pin under the left pin. They have separate loudness taps, so there are seven pins:

If you look carefully at docs's pic, there's no seventh pin. His pot has separate pins for common, and the loudness taps are tied together and go somewhere off the page - almost like there's a wire that solders to the top of the pot down into the board somewhere that I can't see. it's weird.

Docs, see if you can post a pic of the pot, and if you see one give me the part number on it, if it looks different than the number you found in the manual.
I'll try to get this for you tonight.

I did post some pictures of the Bass pot in this thread which has the part number 4-222T-91800 rather than the Volume pot which is 4-222T-91700?!
https://boomboxery.com/forum/index.php/topic/23412-no-loudness-on-sanyo-big-ben-volume-control/
 

caution

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The Sanyo part number isn't all that useful, it's the number on the pot itself I'm after. I don't think Sanyo made pots for themselves, they just bought someone else's and assigned their own internal number to it.
 

caution

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There she is! Weird it's got two loudness tap wires coming off it when the schematic shows they're shorted together. Must be a goof.

There should be more lettering on it and a logo, It probably says 50K, 503, B50K, 50KB, 503B, or something like that and you're just missing it. Doesn't matter though, I can see that it's a style I've never seen before.

If there's no way to repair it then you could modify a Panasonic pot, since it looks like it's got the same bracket and and tabs, but the pins would all have to be rerouted with wire into the holes since the order is completely different.
 

BoomboxLover48

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I cleaned the headphone jacks and speaker output jacks and sound went almost 1/3 more. Decent bass!

I don't see a response with the subwoofer volume. I don't see any effect! Is that normal?

Home theatre subwoofers volume has effect, don't know the power of the amp linked to the subwoofer volume. The mid range shows very good response and moves so well, only the subwoofer volume and the subwoofer cone don't show response to the sub volume pot.
 
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