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Looking for part - exhausted logo search

NormB

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Feb 21, 2020
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This is fun.

From a Willsenton R8 tube amp, there have been reports of some of these potentiometers (pretty sure it’s a rheostat but so far no one I know of has opened one up to look)
487C1498-33D3-4C25-B0F4-6A5B39A90EB0.jpeg


giving up the ghost, factory has sent out entire biasing board to replace.

I’m curious if anyone here recognizes this logo. I’ve tried tineye and half a dozen sites that collect OEM logos.

Not that I have any problems with mine, mind you, but just in case.

Mainly I’m wondering what other components this particular chinese factory uses. Amp is populated with a few Nichicon electrolytics, some Willsenton branded coupling caps. THis one has me stumped.

Thanks in advance.
 

DVDdoug

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I don't recognize the logo. Probably a just a regular pot. But you may not find a replacement with the same physical dimensions.

It shouldn't actually fail... Sometimes volume control (and other audio control) pots become noisy but that looks like and internal (bias adjustment?) pot that's not adjusted everyday so it shouldn't become noisy.
 
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NormB

NormB

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I don't recognize the logo. Probably a just a regular pot. But you may not find a replacement with the same physical dimensions.

Thanks. I found a 1/4 watt Bournes pot (with plastic resistance strip) with 5mm lead spacing which should work, I’m just curious if there’s an actual mfr. so I can look up the specs on the part. Just in case.
 
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NormB

NormB

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I found this forum post with the same question and another image:
View attachment 274140

No answer though :(

I follow that forum (took me the better part of a week to read through and follow up on leads from many of the posts when it was ONLY 220-some pages,now it’s in the 352+ range of pages), remember seeing that, have asked since.

A few folks have found MILSPEC hardware in the price range of $80-100 each, 15k will work too, like I said, just curious to find out WHO makes this so I can maybe track down actual specs/structure.

Time to email Willsenton.
 

egellings

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This is fun.

From a Willsenton R8 tube amp, there have been reports of some of these potentiometers (pretty sure it’s a rheostat but so far no one I know of has opened one up to look) View attachment 274131

giving up the ghost, factory has sent out entire biasing board to replace.

I’m curious if anyone here recognizes this logo. I’ve tried tineye and half a dozen sites that collect OEM logos.

Not that I have any problems with mine, mind you, but just in case.

Mainly I’m wondering what other components this particular chinese factory uses. Amp is populated with a few Nichicon electrolytics, some Willsenton branded coupling caps. THis one has me stumped.

Thanks in advance.
A rheostat, an adjustable resistor, usually a power type, has 2 terminals, while a potentiometer, typically used for small signal level adjustment, acts as a voltage divider and has 3 terminals.
 
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NormB

NormB

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A rheostat, an adjustable resistor, usually a power type, has 2 terminals, while a potentiometer, typically used for small signal level adjustment, acts as a voltage divider and has 3 terminals.

Thank you for that correction. I'm not an EE, just a hobbyist of 50+ years, this distinction was lost on me as someone else, and actual IEEE "expert" on another board, had suggested the part might be a rheostat.
 

egellings

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Thank you for that correction. I'm not an EE, just a hobbyist of 50+ years, this distinction was lost on me as someone else, and actual IEEE "expert" on another board, had suggested the part might be a rheostat.
I'm a combination retired EE and hobbyist experimenter. I'm not an expert at all. An "Ex" is a has been, and a "spurt" is just a drip under pressure. Since I absolutely refused to ever wear a suit & tie, I was never able to wear that title, either. I was better known as "da doer".
 
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NormB

NormB

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I'm a combination retired EE and hobbyist experimenter. I'm not an expert at all. An "Ex" is a has been, and a "spurt" is just a drip under pressure. Since I absolutely refused to ever wear a suit & tie, I was never able to wear that title, either. I was better known as "da doer".
Even worse, in my profession, is what one calls a “specialist.”

A “specialist” is someone who knows more and more about less and less until he finally knows everything there is to know about nothing.


8622CD7D-F8A6-48E2-9226-845B5BDEF3EB.jpeg
 
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