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Old 28th November 2019, 08:50 AM   #1
5k7 is offline 5k7  Poland
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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, 12:56 PM   #2
paczeltf is offline paczeltf  Hungary
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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, 01:57 PM   #3
5k7 is offline 5k7  Poland
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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, 04:47 PM   #4
gpdavis2 is offline gpdavis2  United States
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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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Old 19th February 2020, 01:42 PM   #5
gpdavis2 is offline gpdavis2  United States
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Any update on your project?

Am thinking about these:
https://www.mouser.com/datasheet/2/2..._E-1710801.pdf
DIY products | academyaudio
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Old 20th February 2020, 07:32 AM   #6
5k7 is offline 5k7  Poland
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I was enagaged in other project so i didnt fully start elekit project. Now i'm prototyping new case for it and hopefully project will be ready in next couple of weeks. It's more complicated since i would like to add v-meters like McIntosh does. Also i'm thinking now about adding tone board for digital section also.

Prototype draft version:

Click the image to open in full size.
Click the image to open in full size.

Tone board:
Tone Board: Hi-Res Audio Board Designed for Music Fanatic.
Audioscience review :
Review and Measurements of WesionTEK Khadas Tone Board DAC | Audio Science Review (ASR) Forum
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Old 21st February 2020, 09:14 AM   #7
gpdavis2 is offline gpdavis2  United States
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That's quite ambitious. Keep us posted.

If I can get the remote volume & display done (parts ordered) think I'll look into adding Lundahl SUTs to the MC inputs at some point.

As Victor works with Lundahl for the Elekit amp OPTs, perhaps he would be interested in coming up with an optional kit for their SUTs?

I will repeat that the TU-8500 is a terrific piece and am very pleased every time I listen to it.

Last edited by gpdavis2; 21st February 2020 at 09:44 AM.
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Old 21st February 2020, 02:40 PM   #8
gpdavis2 is offline gpdavis2  United States
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Have ordered the volume control parts kit from this thread.
Muses Volume
Will be interesting to see how it fits in the stock chassis and how it works. Likely be May before there are any results (time flies when having fun).
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