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Microphonics from B1 with Korg NuTube Buffer
Microphonics from B1 with Korg NuTube Buffer
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Old 27th May 2019, 12:05 AM   #1
hirscwi is offline hirscwi  United States
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Microphonics from B1 with Korg NuTube Buffer
Default Microphonics from B1 with Korg NuTube Buffer

My apologies if this question is answered in another thread. I've read quite a bit but might have missed the answer. But I know very little about tubes.

I have a B-1 preamp feeding a Korg NuTube buffer (by P Millett). Yes, I realize this is redundant (buffer on a buffer) but wanted to try out the sound quality of the Nu Tube before I launch into the proper solution (B1 with NuTube from the DIYAudio store). I get microphonics when I switch inputs. Is there a solution to this problem? Is it worth worrying about?

Thank you.
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Old 27th May 2019, 12:31 AM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by hirscwi View Post
I get microphonics when I switch inputs.
Are the two units mechanically coupled together?
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Old 27th May 2019, 01:56 AM   #3
hirscwi is offline hirscwi  United States
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Microphonics from B1 with Korg NuTube Buffer
Quote:
Originally Posted by rayma View Post
Are the two units mechanically coupled together?
They are mounted in the same enclosure.
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Old 27th May 2019, 02:00 AM   #4
rayma is offline rayma  United States
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Quote:
Originally Posted by hirscwi View Post
They are mounted in the same enclosure.
Try temporarily removing the tube board's mounting bolts, and place a cushion
(such as a sponge, etc.) underneath. Is the problem gone?

Last edited by rayma; 27th May 2019 at 02:13 AM.
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Old 27th May 2019, 02:11 AM   #5
nigelwright7557 is offline nigelwright7557  United Kingdom
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I sometimes get microphonics using different tubes in my mixer.
I found the worst ones were cheap Chinese tubes.
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Old 27th May 2019, 03:29 AM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by hirscwi View Post
They are mounted in the same enclosure.
An example of isolation mounting hardware.
ISODAMP™ C-6000 Series - Aearo Technologies | DigiKey
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Old 27th May 2019, 04:28 AM   #7
avtech23 is offline avtech23  Australia
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Microphonics from B1 with Korg NuTube Buffer
I get the same - when I switch the input over, the nutube rings for anything up to 30-40s. I have my nutube mounted on 3m foam pad but the circuit board is attached directly to the chassis without damping.

Perhaps see if you can isolate the switch from the chassis with a rubber washer for example.
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Old 27th May 2019, 12:51 PM   #8
hirscwi is offline hirscwi  United States
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Microphonics from B1 with Korg NuTube Buffer
Thaks for all the tips!
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Old 19th October 2019, 10:40 PM   #9
RobertHaze is offline RobertHaze  United States
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I just built the DIYAudio kit. The NuTube is mounted to the board with double-sided foam tape. The standoffs are too short to allow any rubber washers under the board unless I leave the mounting nuts off.

My NuTube is very microphonic, no, it is intensely microphonic. I've heard normal tubes ring when you tap on them, I've never heard a tube ring from ambient airborne noises before.
I can sit on my couch 7-8 feet away from my rig and clap my hands, and the NuTube will ring. Needless to say, it rings constantly when playing music in the room.
All my test voltages read good. It passes a relatively undistorted sine wave.

The problem is not helped by the ventilation slots in the enclosure covers.
Do you think my NuTube is defective?
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