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Old 2nd March 2013, 06:30 PM   #4851
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Quote:
Originally Posted by 807tubenut View Post
My DCPP
Bolivian rose wood sides, aluminum top.
westinghouse tubes throughout, 6JM6 outputs with 6CB6 drivers.
Nice work. Love the Rosewood.

jeff
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Old 2nd March 2013, 10:53 PM   #4852
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807tubenut, looks good.
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Old 3rd March 2013, 02:40 AM   #4853
AJT is offline AJT  Philippines
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pitures for posterity...

Click the image to open in full size.
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Old 3rd March 2013, 02:49 AM   #4854
Cassiel is offline Cassiel  Libya
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Default I can't see ****

I can hear say.

It was quiet and the night was dark.
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Old 3rd March 2013, 02:59 AM   #4855
Cassiel is offline Cassiel  Libya
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Oops. Forgot one.
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Old 3rd March 2013, 03:51 AM   #4856
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Thanks, working on a couple preamps now.
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Old 3rd March 2013, 10:52 AM   #4857
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Tony: in the next amp where you have the the caps poking through cut off the outer plastic wrapper and spray them. I did it on a amp years ago and it looked good.

Cassiel: love the Meccano look.
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Old 3rd March 2013, 11:35 AM   #4858
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Quote:
Originally Posted by Vincent77 View Post
Sure. Here is the GM-70 SE amp that I've just (almost) finished.

My own schematic, but it's nothing really special.

It outputs a measured 29W RMS before distortion shows. The first stage is a CCS loaded, LED biased D3a (the photos were taken with an E186F in that position). The D3a has enough swing to drive the GM70 into clipping.

The GM-70 are fixed bias. They are constantly monitored by an Arduino microcontroller that I've programmed, which switches off the amp in case of problems. It also does soft start and temporisation, plus LED control to indicate status, problems or overload/clipping.

OPTs are custom gapped (90mA) Lundahl LL1688.

The supplies are in a separated chassis. There are no filtering chokes in my supplies - it's done with Mosfets and SiC Schottky rectifiers, including the 1050v GM70 supply. The kilovolt supply is not stabilized, only filtered;
the 350v supply is stabilized, not regulated (I do not like the sound of regulated supplies).

Together with Rod Coleman's filament supplies, this makes the amplifier absolutely silent, ear to the (95dB) speaker.

It sounds great.

Awesome ! I hope you have a lot of spare GM70 tubes. They are not much sold on ebay anymore except the copperplate version.
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Old 3rd March 2013, 04:19 PM   #4859
Stixx is offline Stixx  Germany
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Quote:
Oops. Forgot one.
From Cassiel's dark caverns...
I almost can hear tortured souls screaming... or is ist oscillation
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Old 3rd March 2013, 08:18 PM   #4860
Cassiel is offline Cassiel  Libya
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Default Light! I can see the light!

Feet not glued yet, one photo is no good. OK, now I'm done with this. To the next project.
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