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Old 20th November 2011, 03:54 PM   #11
GloBug is offline GloBug  Canada
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That's got some wow factor. Very nice work.
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Old 20th November 2011, 04:25 PM   #12
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Nice job. I like the use of the PC card as a strip line for the outputs. If you run this in or near class A I hope it doesn't oscillate on you. You may have to move the stopper resistors closer to the socket connections. Also the filaments might do a little better powered from the center tube, or even end-to-end, to equalize voltage.
I don't think it will oscilate i have built another one OTL amp with 12 PL36 per channel , futterman topology with the same build philosophy and dosen't oscilate at all , the frequency response was high 195 Khz -3db .

Last edited by Dimitris AR; 20th November 2011 at 04:35 PM. Reason: it is similar with post number 10
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Old 20th November 2011, 06:36 PM   #13
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That's got some wow factor. Very nice work.
Thank you very much .
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Old 20th November 2011, 07:19 PM   #14
M Gregg is offline M Gregg  United Kingdom
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Very nice project..

How do you protect your speakers?
ie what type of protection (crowbar)?

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Old 20th November 2011, 07:26 PM   #15
M Gregg is offline M Gregg  United Kingdom
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Is this you?

otl amp.handmade with 12 PL36 tubes per channel . - YouTube

If it is, then its very nice ,,,


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Last edited by M Gregg; 20th November 2011 at 07:30 PM.
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Old 20th November 2011, 07:32 PM   #16
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Yes it is my first OTL , i build it back in 2004 , still playing good right now with many modifications over the years . I dont't use any kind of protections , I DON'T recomend this to anyone for safety reasons , but the amp has no proplem till now .
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Old 20th November 2011, 08:09 PM   #17
M Gregg is offline M Gregg  United Kingdom
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Originally Posted by Dimitris AR View Post
Yes it is my first OTL , i build it back in 2004 , still playing good right now with many modifications over the years . I dont't use any kind of protections , I DON'T recomend this to anyone for safety reasons , but the amp has no proplem till now .
Well I hope you are arround here for a while because I like the amp..

What kind of coupling capacitors do you use or do you DC couple?

Welcome to the forum...

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Old 20th November 2011, 08:55 PM   #18
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Well I hope you are arround here for a while because I like the amp..

What kind of coupling capacitors do you use or do you DC couple?

Welcome to the forum...

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M. Gregg
Thank you a lot Gregg , I use Philips / BC MKP capacitors , sounds good to my ears , MKP 378 or 379 series , maby the 336 2 too .
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Old 20th November 2011, 11:15 PM   #19
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This is the second video . PL36 Handmade Output transformerless tube amplifier by D.Argiannis - YouTube
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Old 21st November 2011, 08:14 AM   #20
M Gregg is offline M Gregg  United Kingdom
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Originally Posted by Dimitris AR View Post
Sounds very clear..what power output do you get from these tubes..?

In the comments to the video you say this is a variation of the futterman..what is the variation from the scheme?

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