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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 15 Aug 2018, 21:44 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Also Matt of you sitting around with nothing to do I've just been given four NOS NIB GE 6J6A tubes. So now a preamp with one whole tube per channel is possible with self bias using both plates, grids etc. in each tube. Just if you are bored. Thanks.

Hope to finish the one I have started already in the next few days.

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PostPosted: 18 Aug 2018, 20:05 
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Not quite a 4S but close. This schematic I'm hoping to use with the 6SN7-SEs I recently bought. Simple enough and it uses two tubes which is what I wanted.
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PostPosted: 19 Aug 2018, 01:05 
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Just a mockup of the 6SN7-SE preamp I'm building. Chassis yet to be painted.. External PS.
Attachment:
image.jpeg
Attachment:
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PostPosted: 19 Aug 2018, 06:50 
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Looks great Mark.. love the valves. I’m not able to understand the schematics as well as i would like but it is helpful to me that this one has the wattages if the resistors and cap voltages indicated.

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PostPosted: 27 Aug 2018, 04:18 
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Attachment:
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Spray job and cheeks oiled. Assembled but not wired. I've called this one "Grace". Let's hope it sounds graceful also.
Attachment:
image.jpeg
Attachment:
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PostPosted: 27 Aug 2018, 12:41 
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I remember that either vtrc.com or analog-metric.com had tubes looking like that. One type even had a blue glass. 8-)

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“If you don't know where you are going, any road will get you there.”
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PostPosted: 27 Aug 2018, 15:50 
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Hi Mark, I love the tubes as well. If you change the volume control to the front end you have a Forewatt. A different PS though.

What is the color of the paint?

Good listening
Bruce

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PostPosted: 27 Aug 2018, 18:10 
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gofar99 wrote:
Hi Mark, I love the tubes as well. If you change the volume control to the front end you have a Forewatt. A different PS though.

What is the color of the paint?

Good listening
Bruce


For my 40th birthday, just a few years back (lol), I bought a Citizen gold watch with a white face. I always felt that gold and white were a good combination. I was thinking a very dark green would also work with the gold. But white won out.

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PostPosted: 29 Aug 2018, 05:06 
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mwhouston wrote:
Attachment:
image.jpeg
Spray job and cheeks oiled. Assembled but not wired. I've called this one "Grace". Let's hope it sounds graceful also.
Attachment:
image.jpeg
Attachment:
image.jpeg

Those look v sexy I might need to consider 6sn7 for my next amplifier design project, thanks.


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PostPosted: 29 Aug 2018, 06:25 
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KochiyaYamato wrote:
mwhouston wrote:
Attachment:
image.jpeg
Spray job and cheeks oiled. Assembled but not wired. I've called this one "Grace". Let's hope it sounds graceful also.
Attachment:
image.jpeg
Attachment:
image.jpeg

Those look v sexy I might need to consider 6sn7 for my next amplifier design project, thanks.

The whole preamp was I inspired by these very special and limited edition tubes. I have always wanted some globes and when these came along I sprang.

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Projects: "Grace" - Psvane 6SN7-SE Globe preamp | | "VoXUno" - Single driver MarkAudio 12P speaker | | "Lagoon Take 2" - Single stage tube preamp | Website: retro-thermionic


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