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Old 8th April 2021, 07:38 AM   #171
jama is online now jama  Spain
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Default Wonderful

George, wonderful solution. Perfect for all people around world.
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Old 8th April 2021, 01:34 PM   #172
Francois G is offline Francois G  United States
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Join Date: Jun 2004
Location: Illinois
UNSET is coming?
Originally Posted by Tubelab_com View Post
I would like to make the "all in one" UNSET board something useful to the widest possible audience. I have been thinking, and re-thinking how to best do this, and I came up with yet another idea last night when I couldn't sleep.....

Any comments?
Hi George,

I admit that I have been overly vocal! And I apologize again for my impatience.

But this is great. I’m not particularly vested in the exact outcome, because I think you could adjust as the demand (for boards) lead you.

In general, I think an option for SS rectification is great. And please allow for the “big xLW6” tubes. That’s all I want for my Christmas this year.
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Old Yesterday, 07:18 PM   #173
mike567 is offline mike567  United States
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BIG +1 for off-board output tubes
maybe include headers for outputs
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Old Today, 05:28 AM   #174
Hearinspace is offline Hearinspace  Canada
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Join Date: Jun 2008
UNSET is coming?
Originally Posted by Tubelab_com View Post
Any comments?
If the output tubes are going to be off board to allow flexibility, can the driver tubes be off board too?
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Old Today, 06:20 AM   #175
hareynolds is offline hareynolds  United States
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Join Date: Oct 2008
Default All Sockets "Off-Board"

Personally, I like the idea of a power/interconnects board, as it gives max flexibility in both layout and tube pin-out.

I previously cobbled together a couple of "power drive" proto boards myself (to test the concept before I committed to the TSE-II monoblocks) which included the driver CCS, the coupling cap, and the MOSFET with resistor "network". Everything else was point-to-point. Worked surprisingly well, although it was pretty sloppy at the end, what with all the "edits". Also, I used a Pete Millett regulated fils supply, so I didn't need that on the board.

For example, the board could include:

B+ P/S filters (like SSE and TSE)
CCS (ie 10M45)
MOSFETs and associated resistors/trimpots

Rectifier, drivers, and Power tubes would all be "off board."

If the board (or boards, if mono) had a narrow form factor (say 2-1/2" or 3" wide) they could be mounted VERTICALLY, which would be a lot better thermally.
That's how I mount the Millet regulated fils supply, BTW.

That is, all of the heat-sinked "sand" could be arranged in a row, ie diodes/fils regulator/CCS/ MOSFET with a row of holes in the chassis directly above.

The counter argument, of course, is that off-board sockets increases the risk of screw-ups, some of which might be spectacular.

In addition, off-board sockets make care in wiring more critical, especially for the driver(s) and the filament wiring (although DC makes fils wiring lots less fussy).

IF the UNSET is intended to be dead-nuts simple and a good "first build" (like the SSE, which I think is the best beginner tube amp out there), then I think that at LEAST the driver sockets must be on-board.

HOWEVER, if as I suspect, the UNSET requires more sophisticated build and adjustment techniques (like the TSE-II and the Universal Driver UD board), then just give us PADS for wires to grid/plate/anode/screen/fils and we can figure it out.

Alternately, screw terminals for the socket leads would make a super-flexible prototyping amp that could be ENCLOSED and maybe even dragged "upstairs" to try-out on the good speakers...

None of these ideas are critical; many of us (George included) have hacked the TubeLab boards within an inch of their lives. I still have an SSE board which has hosted 6AV5s, 6BQ6s, and assorted other mongrels. Others have "glued" DHTs on there.

Just some thoughts....
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Old Today, 10:34 AM   #176
77seriesIII is offline 77seriesIII  Germany
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Second the BIG +1 for tubes off the board. Sounds like a plan George!
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Old Today, 10:41 AM   #177
dch53 is offline dch53  Australia
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Join Date: Jun 2015
Location: Perth, Western Australia
I must dissent! Output tubes not on the board, maybe.

The less point-to-point wiring the better. I always opt for putting as much as possible on any PCB. Much more reliable and fewer mistakes.
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