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OA 3 tube fluctuating brightness. (Read 2032 times)
roggae
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OA 3 tube fluctuating brightness.
01/28/13 at 22:40:06
 
Left channel tube is fluctuating in brightness while playing. Not slowly. It looks like it is losing a little juice then it comes back. Should I be concerned?

http://youtu.be/XQFnJosGKMs

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« Last Edit: 01/28/13 at 23:06:00 by roggae »  
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Rivieraranch
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Re: OA 3 tube fluctuating brightness.
Reply #1 - 01/28/13 at 23:36:56
 
Switch it with the other one and see if that behaves like the tube that is flickering.
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roggae
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Re: OA 3 tube fluctuating brightness.
Reply #2 - 01/28/13 at 23:42:05
 
That's the first thing I did. The fluctuation stayed in that tube.
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« Last Edit: 01/28/13 at 23:46:22 by roggae »  
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Rivieraranch
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Re: OA 3 tube fluctuating brightness.
Reply #3 - 01/29/13 at 00:24:58
 
Maybe you should call Steve.
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roggae
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Re: OA 3 tube fluctuating brightness.
Reply #4 - 01/29/13 at 00:35:24
 
Does that mean you think it could be something more troublesome? A replacement is like $8. Thanks for the responses!
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Fireblade
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Re: OA 3 tube fluctuating brightness.
Reply #5 - 01/29/13 at 01:02:36
 
These are not expensive.  Just by yourself a pair of new ones.  These NOS tubes are generally very sturdy (Sylvania, RCA, etc.).

If you were to experience the same issue with one of the new ones, then call Steve.
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« Last Edit: 01/29/13 at 01:03:09 by Fireblade »  

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Rivieraranch
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Re: OA 3 tube fluctuating brightness.
Reply #6 - 01/29/13 at 01:46:55
 
These tubes are all vintage. They are not in current production. You can find military and industrial types out there that are NOS.
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roggae
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Re: OA 3 tube fluctuating brightness.
Reply #7 - 01/29/13 at 01:55:58
 
I guess my main concern was "is this going to hurt my amp?"
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Fireblade
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Re: OA 3 tube fluctuating brightness.
Reply #8 - 01/29/13 at 01:57:20
 
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« Last Edit: 01/29/13 at 02:02:16 by Fireblade »  

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Fireblade
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Re: OA 3 tube fluctuating brightness.
Reply #9 - 01/29/13 at 02:00:57
 
Roggae,

If the particular tube is faulty, I would stop using it altogether.  Just replace that pair and see if the problem goes away.  This would not make anything worse.  If the problem persists with the replacement, stop the amp and call Steve.
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« Last Edit: 01/29/13 at 02:03:10 by Fireblade »  

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roggae
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Re: OA 3 tube fluctuating brightness.
Reply #10 - 01/29/13 at 02:03:16
 
You know, mine look nothing like those. Am I mistaken? Mine look like my stock 6v6s only smaller.
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Fireblade
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Re: OA 3 tube fluctuating brightness.
Reply #11 - 01/29/13 at 02:10:41
 
It does not matter.  My stock ones are larger than any 6V6 tubes I've tried so far (Coke shaped, with wide shoulders).  

The important thing is to use the same spec tube.  These come in different shapes and sizes, but internally are all equivalent and should do the job.  

They may sound slightly different than your originals, in which case if you prefer that sound, just buy those same ones. Technically, there are no differences.
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« Last Edit: 01/29/13 at 02:11:22 by Fireblade »  

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Rivieraranch
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Re: OA 3 tube fluctuating brightness.
Reply #12 - 01/29/13 at 02:23:21
 
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« Last Edit: 01/29/13 at 02:26:30 by Rivieraranch »  

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Fireblade
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A.L.Tennyson

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Re: OA 3 tube fluctuating brightness.
Reply #13 - 01/29/13 at 10:55:11
 
RR,

My point was that the Op could easily and inexpensibly replace them and find out what the real issue is with his amp.

It is well documented that, in general, these voltage regulator tube types last for a long time and are very robust.

Having said that, better reputed vintage NOS types 'may' even sound better and may last longer.  The Op will always have the prerogative of choice.

Thanks!

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« Last Edit: 01/29/13 at 10:56:06 by Fireblade »  

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Rivieraranch
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Re: OA 3 tube fluctuating brightness.
Reply #14 - 01/29/13 at 12:14:51
 
My point was that the older ones might do better.
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