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Old 17th May 2012, 02:25 AM   #521
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Default otl amplifier

in OTL you can always use any output tube you like,the first OTL by Frank Gilbert use 2A3 in 1951 in class A configuration,most available schematics are in class AB with 3 to 4 pre-stages,8417 tube is one of my favorite OTL tube in class A operation with single stage front driver which I can also rol it with the new Tungsol KT 120,sound wise,transformer coupled amp can't even come close in imaging and transparency of an OTL.
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Old 3rd June 2012, 11:17 PM   #522
BUIZERD is offline BUIZERD  Netherlands
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Good day all,

It's a bit silent on this thread.
I am very curious about how everyone has perished with the construction of the M60 clone.

I myself am also building the M60, but I get quite a few problems.
There is quite some hum present, and I do not know how I can solve it.

I've done everything Ralph Karsten and Mullard EL34 suggested, but I have no options left to pull it off.
Maybe someone has more ideas.

Regards Hans
Netherlands
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Old 3rd June 2012, 11:21 PM   #523
djn is offline djn  United States
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Hi Hans, I've been lurking here for some time now. I don't need much power as my drivers are 113db eff so I am building the Tim Mellow OTL at 25 wpc.
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Old 4th June 2012, 12:27 AM   #524
BUIZERD is offline BUIZERD  Netherlands
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Hi DJN,

I do not have such high efficiency speakers,
I play with Roger Monitors, not world known, but the design of Dr Balley, and a pair of Jaen Mary Reynoud Opus 1 and a set Celestions 6sl6i. it is all old stuff, but surprisingly good, so i can swap every now and then
These are average speakers and my listening room is not that big.

I know nothing of the TIM MELLOW amplifiers.
But each his thing.

I was not looking for much power, but it seemed to me a challenge to build these amps.

I started with a set of 211SE amplifiers to the design of Triode Dick, a world known person in the Netherlands.

These amplifiers play very well, the challenge is, if I can surpass the sound with the M60.

And I like to do some fiddling with old electronics.
Not that I know much.

Greats Hans
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Old 11th June 2012, 10:23 PM   #525
BUIZERD is offline BUIZERD  Netherlands
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Anybody Alive??????
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Old 6th July 2012, 02:35 PM   #526
PET-240 is offline PET-240  Australia
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Well I'm alive but only just found this thread.
Currently building Transcendent Beasts but the Class A2 has me intrigued.....
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Old 6th July 2012, 03:16 PM   #527
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Quote:
Originally Posted by BUIZERD View Post
Anybody Alive??????
Hi,

I'm alive, just got 32 Svetlana 6H13C, but now I'm very busy and I think I'll build M60 in a couple of months or so.

Andrea
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Old 6th July 2012, 10:15 PM   #528
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Quote:
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I don't need much power as my drivers are 113db eff...
No, you certainly don't need much power. That's solidly in headphone territory. How do you achieve it?
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Old 7th July 2012, 01:23 PM   #529
dady is offline dady  Balearic Islands
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Quote:
Originally Posted by andrea_mori View Post
Hi,

I'm alive, just got 32 Svetlana 6H13C, but now I'm very busy and I think I'll build M60 in a couple of months or so.

Andrea
Hi Andrea, how much did you pay for the valves?
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Old 7th July 2012, 01:49 PM   #530
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Hi Andrea, how much did you pay for the valves?
Hi,
about 6$ each, 235$ for 32 valves including shipping.
I bought them on eBay from an Ukrainian.

Andrea
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