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Old 28th November 2019, 09:50 AM   #1
5k7 is offline 5k7  Poland
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Join Date: Apr 2019
Default Elekit Tu-8500 + LITE MV06

Hello,

I would like to add remote module - LITE MV06 to my Elekit TU-8500.

Input selectors are not a problem since i wil just simply connect them instead of rotary switch inputs.
I'm not so sure in terms of volume. Original potentiometer has 50k but on remote module there is 100k ALPS.

So my questions is - should i change any resistor (R35-R38) value to fit same characteristic like it was on 50k pot or there is no reason to change anything?

Here is volume diagram:
Click the image to open in full size.

Full circuit diagram:
LINK

Thanks in advance.
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Old 28th November 2019, 01:56 PM   #2
paczeltf is offline paczeltf  Hungary
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Join Date: Jan 2018
Location: Budapest
The max. grid resistor value is 1M for both 12AT7 and 12AU7 so you should be fine with a 100k pot. The noise will be very slightly higher, the HF bandwidth slighly lower, and the attenuation curve will change (a bit lower volume at the same setting except for the zero and max levels).
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Old 29th November 2019, 02:57 PM   #3
5k7 is offline 5k7  Poland
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Join Date: Apr 2019
Quote:
Originally Posted by paczeltf View Post
The max. grid resistor value is 1M for both 12AT7 and 12AU7 so you should be fine with a 100k pot. The noise will be very slightly higher, the HF bandwidth slighly lower, and the attenuation curve will change (a bit lower volume at the same setting except for the zero and max levels).
Great, thanks a lot for confirmation.
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Old 29th November 2019, 05:47 PM   #4
gpdavis2 is offline gpdavis2  United States
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Join Date: Aug 2004
Location: NJ Shore
5k7 - any chance you can post a pic or three of your ventures adding a remote to your TU-8500? I'm thinking that is the only thing missing. Have been giving some thought to Placette or Luminous passive preamp on the output, but that seems a waste.
Thx.
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