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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 20 Jul 2015, 18:42 
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Joined: 15 Nov 2013, 10:16
Posts: 250
Location: MB, Canada
I thought this was going to be an easy one to find the answer to, but I can't seem to find the answer.

Does the envelope on a vacuum tube change size when it heats up? Even a small variation?

I'm looking at mounting a tube slightly through the top of an aluminum plate, and so I want to know how much air space needs to be around the envelope.


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PostPosted: 20 Jul 2015, 19:21 
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Joined: 06 Apr 2009, 10:08
Posts: 1607
Location: US Pacific Northwest
There has to be enough room for air to flow around the tube. Think 1/8" minimum for a signal tube and a minimum of 1/4" to 3/8" inch for a power tube. I split the definition by overall power dissipation (heater + plate) at about 2-1/2 watts. YMMV.

Warning: Metal close to a vacuum tube can get HOT! Make appropriate design accomidations.

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PostPosted: 20 Jul 2015, 20:43 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
I agree and use similar spacings. Additionally you may want to be sure the tubes themselves are spaced apart. I like to use about one diameter of the tube separation between tubes. More is better.

Good listening
Bruce

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PostPosted: 20 Jul 2015, 23:15 
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Joined: 15 Nov 2013, 10:16
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Location: MB, Canada
Thanks guys.


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