Tubes Asylum

Questions about tubes and gear that glows.

Return to Tubes Asylum

Message Sort: Post Order or Asylum Reverse Threaded

Electro Harmonix 6922's in Anthem PRE 2L

24.168.44.243
Posted on May 26, 2012 at 17:42:58
GCrouser
Audiophile

Posts: 286
Location: NY
Joined: January 18, 2006
 Hello All, I lurk in a lot of these forums (mainly Computer Audio) but rarely post. I recently got an Anthem PRE 2L. It sounded fine except the left channel was lower in volume. Had to deploy balance control to almost 9 o'clock. I got some new EH 6922's & balance is normal. These tubes are a tad more upfront & less dimensional than the Tesla E88CC's that were in it. But I've got no complaints, they sound fine. I can see rolling in some alternatives down the road after I learn more about various NOS options. But I will use this unit in bypass mode any time I turn the TV on. So, maybe I'll end up sticking with the EH's.

My question is: what is the break/burn-in situation with these tubes ? Will they change much ? Any other recommendations ?

Thanks, & enjoy the Holiday weekend !

Greg

 

Hide full thread outline!
    ...
RE: Electro Harmonix 6922's in Anthem PRE 2L, posted on May 26, 2012 at 19:32:36
Caucasian Blackplate
Industry Professional

Posts: 4959
Location: Seattle
Joined: June 18, 2004
 Hello Greg,

Yes, EH tubes need at least 50 to 100 hours to stabilize. This phenomenon is easily measurable with small EH tubes, and one would guess that the run-in at the factory is not super long.

-PB

 

RE: Electro Harmonix 6922's in Anthem PRE 2L, posted on May 26, 2012 at 21:07:52
Jim McShane
Dealer

Posts: 4781
Location: Chicago
Joined: January 13, 2003
 "This phenomenon is easily measurable with small EH tubes"

That's really interesting - what is you you are measuring?

Thanks for sharing the info.

 

RE: Electro Harmonix 6922's in Anthem PRE 2L, posted on May 26, 2012 at 22:26:25
Caucasian Blackplate
Industry Professional

Posts: 4959
Location: Seattle
Joined: June 18, 2004
 Hello Jim,

I will setup a given tube in a test jig with a regulated supply, CCS load, and then monitor the plate voltage.

For some reason, the EH tubes wander around more in the first tens of hours than other new brands. Even something like a 6J32P hits its marks immediately in comparison to the EH EF86.

-PB

 

I had the same experience...., posted on May 26, 2012 at 22:35:16
kootenay
Audiophile

Posts: 4520
Location: Calgary, Alberta
Joined: October 16, 2007
Contributor
  Since: April 6, 2008
 The NOS Tesla ECC88 that I've tried hit the mark as soon as 5 hours of burning in, whereas the EH 6922 was still wandering all over the place before settling down at around 50 hours of burning in. As the matter of fact I thought I had a bad batch of EH.


If a thing's worth doing, it's worth doing well
(Proverb)

 

RE: Electro Harmonix 6922's in Anthem PRE 2L, posted on May 28, 2012 at 07:32:00
GCrouser
Audiophile

Posts: 286
Location: NY
Joined: January 18, 2006
 Thanks for the help guys.

Greg

 

RE: Electro Harmonix 6922's in Anthem PRE 2L, posted on May 31, 2012 at 17:39:05
Eli Duttman
Audiophile

Posts: 7599
Location: Plainsboro, NJ
Joined: March 31, 2000
 Who did you buy from? Did they test the tubes, before shipping them out?

Ever hear of cathode "sleeping sickness"? A competent vendor knows how to deal with the matter and not give the customer a "headache".

Eli D.

 

I was happy with cryo'ed gold pin EH for a while, posted on June 3, 2012 at 08:34:21
jedrider
Audiophile

Posts: 9937
Location: No. California
Joined: December 26, 2003
 Thought they were a very significant step up from the Tesla originally in there. One EH went noisy recently, and so now I have two EH and two Tesla in there. Sounds fine to me!

Cost was $25-$30 per tube at four tubes. I am comfortable with the outlay. I hope the noise issue is not a usual event though. After a year or so it is in the category of a premature failure.

 

Page processed in 0.011 seconds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2013, Audio Asylum, all rights reserved ] [ Take5 ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]