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 Post subject: Re: matched tubes
PostPosted: Tue Mar 28, 2017 12:03 pm 
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Joined: Thu Jan 13, 2011 11:29 am
Posts: 427
Location: St.Catharines, ON, CA
Paul,

Still working on that channel imbalance ?

Gary


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 Post subject: Re: matched tubes
PostPosted: Tue Mar 28, 2017 12:27 pm 
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Joined: Fri Oct 21, 2005 9:08 am
Posts: 73
Location: Ottawa, ON, CA
I spoke with Art when I ordered them and he confirmed that they were matched.

As for microphonics, I believe that as I ordered the "AA ultra low noise" they would have been examined for microphonics. To be clear, I did not confirm or ask questions regarding microphonics, only matching.

BTW, I don't notice any noise on my Benz micro glider / Alphason / Oracle into the AI M3A Preamp into a YBA2 HCDT and Totem Mani2's. IMHO.

He also sent a few replacement gold coloured screws that I wanted to replace, without charge.

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 Post subject: Re: matched tubes
PostPosted: Tue Mar 28, 2017 1:31 pm 
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Joined: Sun Dec 13, 2015 9:36 am
Posts: 353
Location: scarborough, ON, CA
sasquatch wrote:
Paul,

Still working on that channel imbalance ?

Gary

Check your pm Gary


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 Post subject: Re: matched tubes
PostPosted: Tue Mar 28, 2017 6:22 pm 
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Joined: Tue Dec 19, 2006 11:44 pm
Posts: 6087
Location: Toronto, ON, CA
dtsaudio wrote:
When it comes to small signal tubes matching can give you better channel balance, but is not usually necessary. It depends on the circuit whether audible or not.
It is usually better to match power tubes, at least matched per channel. This is most important if there is not individual bias or the tubes are cathode biased. If the tubes have individual bias, matching becomes less important, however for maximum power and performance matching is always better.
Tubes typically have a fairly broad measurement tolerance, so just because they are the same tube, they could be as much as 20% - 25% off from each other.


How important is it to 'match' power tubes when using an amplifier with 'fixed bias' that you adjust yourself?

Trust I'm using the right terminology.

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