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PostPosted: Fri May 12, 2017 1:32 pm 
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Location: GARSON, ON, CA
Is more important to match power tubes, or the preamp tubes (the small tubes like 12AX7)?

I would think matching is more important with power tubes as they draw more power and could affect/change amplifier bias.

On dual amplifier systems, is it recommended to match tubes across both amplifiers? Or is matching within one amplifier good enough?

Thanks.


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PostPosted: Fri May 12, 2017 3:50 pm 
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While I wait for my answer, I thought I'd update my thread. My mind might be playing tricks, but I'm hearing more punch and more depth from one channel I swapped tubes (power tubes only). Much more pronounced that I would have believed.

I'm hearing more "boom" and almost a undertone like you would get with vibration feedback through a turntable (playing a cd). Do tubes need to break in as well as warm up?


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PostPosted: Fri May 12, 2017 3:57 pm 
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It is always recommended to have very closely matched power tubes
Also very important to have your small signal tubes also matched;
* for close emission readings
* for close matched section in a tube
My 3 cents :)


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PostPosted: Fri May 12, 2017 3:59 pm 
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jastremsky wrote:
It is always recommended to have very closely matched power tubes
Also very important to have your small signal tubes also matched;
* for close emission readings
* for close matched section in a tube
My 3 cents :)


Would that be true if you were doing the biasing yourself?

I understand the importance of matched power tubes when the amp is 'self biasing'...

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PostPosted: Fri May 12, 2017 4:42 pm 
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Thanks VoodooFunk,
I forgot to mention biasing as an important factor.
Most audio enthusiasts don' t have a tube tester or a bias apparatus, thus are reliant on tube info. from seller or tube stores


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PostPosted: Tue Dec 26, 2017 5:13 pm 
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Good info. I'm a newbie and bought some new matched Octet 6550 tubes. Each tube came in two numbers from the seller and the numbers ranged from: 41.9/4780 vs. 40.1/4810 vs. 41.0/4250, etc. An one mind explaining to me what the two numbers stand for per tube? And from what I can tell, the numbers doesn't seem quite matching to my eyes or do they? Many thanks.


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PostPosted: Tue Dec 26, 2017 5:37 pm 
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jastremsky wrote:
Thanks VoodooFunk,
I forgot to mention biasing as an important factor.
Most audio enthusiasts don' t have a tube tester or a bias apparatus, thus are reliant on tube info. from seller or tube stores



Why would u need a tube tester to bias an amp?

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