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Vacuum Tube OTL power amp!!
Vacuum Tube OTL power amp!!
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Old 20th May 2011, 07:30 PM   #21
M Gregg is offline M Gregg  England
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What chassis size have you used?


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M. Gregg
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Old 20th May 2011, 07:31 PM   #22
Alastair E is offline Alastair E  Wales
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Its a 19" Rack box, Nothing special or pretty....
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Old 20th May 2011, 07:37 PM   #23
M Gregg is offline M Gregg  England
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So the PSU is Bi-polar + / - 150vDC, and 350vdc.
ss rectifiers?
What transformer have you used, current rating / voltage -make...LOL
Photo?

Sounds like an interesting project.

It's OK if the PSU is secret it can make or break an amp!


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M. Gregg

Last edited by M Gregg; 20th May 2011 at 07:39 PM.
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Old 20th May 2011, 07:54 PM   #24
Alastair E is offline Alastair E  Wales
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PSU is completely standard. a SS Bridge-rec, after a large toroid I had floating round, I think it was an Isolating transformer...

I do have large 'RIFA' screw-term 3300uF 200V leccy-litics in each 150v rail, de-coupled by a couple of 10uF plastic caps...

The 350V supply is from a separate 'Maplin' mains Tx with CLC filtering....
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Old 20th May 2011, 09:07 PM   #25
M Gregg is offline M Gregg  England
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Thank's Alastair,

I may take this forward just for fun.

Is the SS rectifier just a standard bridge / or Hex ect?
Any snubbing used?
I guess no regulation?

With CLC filtering any Ideas on value of L you have used?

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M. Gregg

Last edited by M Gregg; 20th May 2011 at 09:12 PM.
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Old 20th May 2011, 09:14 PM   #26
Alastair E is offline Alastair E  Wales
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Yup--standard ss bridge, no 'snubbing' and no regulation

The choke on the 350V line is 10H and 100uF caps, and SS rec.....
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Old 20th May 2011, 09:16 PM   #27
DouglasSelf is offline DouglasSelf  United Kingdom
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You will find some old Wireless World articles on OTL valve amplifiers here:

The Wireless World Archive
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Old 20th May 2011, 09:17 PM   #28
M Gregg is offline M Gregg  England
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Quote:
Originally Posted by Alastair E View Post
Yup--standard ss bridge, no 'snubbing' and no regulation

The choke on the 350V line is 10H and 100uF caps, and SS rec.....


Thank's again.

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M. Gregg
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Old 20th May 2011, 09:38 PM   #29
woody is offline woody
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Any chance of a pc board for the amp?
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Old 20th May 2011, 09:47 PM   #30
Alastair E is offline Alastair E  Wales
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Of which...?

Mine..?

Personally, I wouldnt bother with PCB's --especially if you're using 6C33C tubes--WAY too hot for 'em!

Nah, its all p2p wiring, no PCB for mine...
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