News: Trouble logging in? Log in from the login page.
September 18, 2020, 03:54:38 AM

Author Topic: Microphonics?  (Read 364 times)

0 Members and 1 Guest are viewing this topic.

Offline adeep42

  • Full Member
  • ***
  • Posts: 174
Microphonics?
« on: July 17, 2019, 05:03:37 AM »
The Eros 2 that I've been on the forum with mostly with PB is my second. The first, an original Eros is in my main system. After the new one is completed, one or the other will go into a new second system that I am working on.

The subject line is my only issue with the current Eros. During about the first half hour that the Eros is on, it is subject to extreme sensitivity to even the most minute vibration. A light touch to the top or any tube will stop it. I believe it is either the 12AU7 or the 6922 as both channels are affected.

Any thoughts?
Crack with Speedball
Eros
VPI Prime
Ortofon Cadenza Bronze
Bob's Devices VPI SUT
Phoenix Eagle PSU & Tach
Cambridge 752BD
Apple Airport Express
PrimaLuna Prologue Pre-amp
PrimaLuna Prologue Amps(as mono-blocks)
Martin Logan Summit X's

Offline oguinn

  • Sr. Member
  • ****
  • Posts: 663
    • DIY Audio Gallery
Re: Microphonics?
« Reply #1 on: July 17, 2019, 05:30:48 AM »
Could you swap in the tubes from your other Eros and see if it's the tubes?
Jameson O’Guinn

-

Main System: Schiit Bifrost MB, Schiit Sol, Eros 2, BeePre, Kaiju/Stereomour II, Jägers, Mainline

Desktop System: Crack with Speedball

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 8234
    • Bottlehead
Re: Microphonics?
« Reply #2 on: July 17, 2019, 05:33:15 AM »
Sounds like the 6922. If it goes away in half an hour I would live with it, as the system won't sound its best until it's been on that long anyway.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline adeep42

  • Full Member
  • ***
  • Posts: 174
Re: Microphonics?
« Reply #3 on: July 17, 2019, 08:29:28 AM »
Thank you Doc and Jameson. Sometimes I just don't have the patience to wait a half an hour. The noise from the microphonics actually makes me worry about my speakers. It can be that loud.
Crack with Speedball
Eros
VPI Prime
Ortofon Cadenza Bronze
Bob's Devices VPI SUT
Phoenix Eagle PSU & Tach
Cambridge 752BD
Apple Airport Express
PrimaLuna Prologue Pre-amp
PrimaLuna Prologue Amps(as mono-blocks)
Martin Logan Summit X's

Offline Tom-s

  • Sr. Member
  • ****
  • Posts: 431
Re: Microphonics?
« Reply #4 on: July 17, 2019, 09:20:58 AM »
You've got yourself an excuse to get those fancy Siemens or Telefunken E88CC's  :P  :-X

Offline adeep42

  • Full Member
  • ***
  • Posts: 174
Re: Microphonics?
« Reply #5 on: July 23, 2019, 11:52:13 AM »
Didn't go all the way with the Siemens or Telefunkens, but did get a new Genalex from Tube Depot. Definitely better, but still slightly prone to some issues. Did notice that the tube shields on that Eros, the older one, do not have springs inside while the shields on the new one do. Could that be a contributing factor.

Best to all, Nice to have the forum back.
Crack with Speedball
Eros
VPI Prime
Ortofon Cadenza Bronze
Bob's Devices VPI SUT
Phoenix Eagle PSU & Tach
Cambridge 752BD
Apple Airport Express
PrimaLuna Prologue Pre-amp
PrimaLuna Prologue Amps(as mono-blocks)
Martin Logan Summit X's

Offline Tom-s

  • Sr. Member
  • ****
  • Posts: 431
Re: Microphonics?
« Reply #6 on: July 23, 2019, 09:03:09 PM »
Tube shields are easily found ebay. Complete with springs.
These fit the socket/shield that come with BH kits.
I've used them on Mainline with good succes.

https://ep1.pinkbike.org/p5pb16498303/p5pb16498303.jpg

Offline adeep42

  • Full Member
  • ***
  • Posts: 174
Re: Microphonics?
« Reply #7 on: July 24, 2019, 06:54:52 AM »
Thanks Tom,

Just ordered some.

Alan
Crack with Speedball
Eros
VPI Prime
Ortofon Cadenza Bronze
Bob's Devices VPI SUT
Phoenix Eagle PSU & Tach
Cambridge 752BD
Apple Airport Express
PrimaLuna Prologue Pre-amp
PrimaLuna Prologue Amps(as mono-blocks)
Martin Logan Summit X's

Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 13536
Re: Microphonics?
« Reply #8 on: July 24, 2019, 10:11:40 AM »
Didn't go all the way with the Siemens or Telefunkens, but did get a new Genalex from Tube Depot. Definitely better, but still slightly prone to some issues. Did notice that the tube shields on that Eros, the older one, do not have springs inside while the shields on the new one do. Could that be a contributing factor.

You can pull the springs out of the new shields.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man