News:
May 16, 2022, 01:10:30 AM

Author Topic: Tapping sound heard in headphones  (Read 1454 times)

0 Members and 1 Guest are viewing this topic.

Offline sjeffrey

  • Jr. Member
  • **
  • Posts: 39
Tapping sound heard in headphones
« on: October 11, 2013, 03:58:56 PM »
Hey guys,
so I noticed this week that if I tap on the crack's top plate I can hear it in my right channel.  This is unaffected by the volume and doesn't go away after it being powered on for a while.  I checked all solder joints and reflowed any of them that didn't seem perfect.  The problem was still there.  If I would tap on the input tube lightly I would hear it but not on the output tube.  This was with stock tubes.

Now I was holding off on trying a GEC brown base 6as7g that I had so I figured I would try it now.  I also have and RCA clear top for with both tubes changed I was hoping it would go away.  Well now it's even worse.  I can hear the tapping and if I tap lightly on the output tube it's tapping sound is kind of echo.  Tapping on the input tube is a much lower clunk type sound.  With this setup I can also detect some of the tapping sound on the left channel.

Is all this normal?  The GEC is probably microphonic if I understand correctly what that term means.  Hopefully there's something I can do to make it better.  Even typing on my keyboard I hear it in my headphones with the GEC.

Thanks,
Stephane

Offline STURMJ

  • Sr. Member
  • ****
  • Posts: 279
Re: Tapping sound heard in headphones
« Reply #1 on: October 11, 2013, 04:23:18 PM »
This is "normal" different tubes will display more or less microphonics. I assume the crack is on the same surface as your keyboard , ( desk or table)  you could find some squishy feet for your crack, or move it off that surface .  I recomend bright star isonodes they are about 3/8" tall and quite squishy.  There are many other options also.

Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 16779
Re: Tapping sound heard in headphones
« Reply #2 on: October 11, 2013, 07:58:30 PM »
This is normal.

The solution is to stop tapping your Crack ;)
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline palmfish

  • Jr. Member
  • **
  • Posts: 32
Re: Tapping sound heard in headphones
« Reply #3 on: October 12, 2013, 09:08:33 AM »
OMG, the puns and double entendres here... I cant stay away...lol

EDIT: And yes, mine does it too. I have found other things to tap.
« Last Edit: October 12, 2013, 09:12:44 AM by palmfish »

Offline jimiclow

  • Full Member
  • ***
  • Posts: 123
Re: Tapping sound heard in headphones
« Reply #4 on: October 12, 2013, 10:22:19 AM »
Any microphonics in the Crack is nothing compared to the Quickie.
Bottlehead Stereomour with V-cap, Mundorf, Alps
SEX 2.1- Alps, Mundorf
Stock Crack
Reduction with Mundorf, Clarity caps
Schiit Asgard, Schiit Lyr
Technics SL1200mkII
Woo WA-6
Hoyt-Bedford speakers, Fostex T90A
LCD-2, HD600, ER4P, HF5, SR60i, DT990-600, DT770-32, HFI580