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Vacuum Tube OTL power amp!!
Vacuum Tube OTL power amp!!
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Old 31st December 2011, 12:36 AM   #691
Dimitris AR is offline Dimitris AR  Greece
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So , you will keep it as a secret ?
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Old 31st December 2011, 01:12 AM   #692
flatheadmurre is offline flatheadmurre  Sweden
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Join Date: Mar 2011
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Not a secret just has a number from telecom company no regular tube number and some data from the equipment used in.

Some low Ra variation of Ericssons 6761 perhaps.

Inner structure a bit bigger then a 6BQ5.

Gold pins indicate longlife.

Last edited by flatheadmurre; 31st December 2011 at 01:20 AM.
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Old 1st January 2012, 01:15 AM   #693
Dimitris AR is offline Dimitris AR  Greece
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Can you post a picture of it ?
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Old 1st January 2012, 02:33 AM   #694
flatheadmurre is offline flatheadmurre  Sweden
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IŽll give it a try later when when the new years party gets out of my system.

Wishing you all a happy new Year.
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Old 1st January 2012, 09:11 AM   #695
M Gregg is offline M Gregg  England
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Happy New year...

Lets hope it brings good things

Best wishes
M. Gregg
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Old 1st January 2012, 09:24 AM   #696
M Gregg is offline M Gregg  England
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Join Date: Jun 2010
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Just for fun.

Just trying the HV Mosfet...20A device...


Regards
M. Gregg
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File Type: jpg Mozener.jpg (183.2 KB, 254 views)
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Old 1st January 2012, 09:41 AM   #697
flatheadmurre is offline flatheadmurre  Sweden
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Looking good !

I switched to a TO-3p to just for comparsion of heat transfer.

Click the image to open in full size.

TO-3/TO-220 didnŽt do much difference when topplate heats up the device drifts a bit.
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Old 1st January 2012, 09:49 AM   #698
M Gregg is offline M Gregg  England
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I have an idea,

I intend to leave the top plate alone,
I have a dividing plate that the tube bases are mounted on, (I'm going to leave this alone as well) and mount another false plate under the dividing plate. This I intend to use as the heat sink for the Mozener. The dividing plate has large holes for air flow so the hope is the air will travel across the new plate and through the holes...

Regards
M. Gregg
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Old 1st January 2012, 10:11 AM   #699
flatheadmurre is offline flatheadmurre  Sweden
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Your layout is probably better than mine with several heat barriers.

I thought of putting the Moz on the side of the case.
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Old 1st January 2012, 10:24 AM   #700
M Gregg is offline M Gregg  England
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Quote:
Originally Posted by flatheadmurre View Post
Your layout is probably better than mine with several heat barriers.

I thought of putting the Moz on the side of the case.
I find that a double skin works well even with just a 3-5mm between as long as there is air flow across / between the surfaces.

I also found that there is little point in trying to cool an area of metal sometimes its better to isolate it from the chassis and let it do its thing..The reason is anything attached to it to try to cool it will just come up to the same temp...and cause even more problems.. The wooden sides prevent heat transfer between levels..also stops ringing..as long as the heat is managable on each plate..
another thing that works ok is to put a row of holes between two areas of the metal the heat transfer is slower and a heat reduction can be had across each side of the holes...down side is loss of strength caused by the holes..

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M. Gregg
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