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Old 18th April 2021, 09:53 PM   #201
jammer55 is offline jammer55  United States
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UNSET is coming?
Got some 36lw6 waiting.
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Old 19th April 2021, 01:11 AM   #202
hareynolds is offline hareynolds  United States
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I like the Plethora of Pads.
(good name for a musical group in One Flew Over the Cuckoo's Nest)
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Old 19th April 2021, 02:49 AM   #203
w5jag is offline w5jag  United States
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Those boards look good.
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Old 19th April 2021, 03:00 AM   #204
sunil is offline sunil  India
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Originally Posted by Tubelab_com View Post
Ordered......
Nice.
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Old 19th April 2021, 04:54 AM   #205
BTW is offline BTW
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Great... look forward.
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Old 19th April 2021, 06:24 PM   #206
mike567 is offline mike567  United States
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Minor pick... would have been nice to have them symetrical Lining up driver and power tubes


Remote mounting power tubes will solve that nit-pick
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Old 20th April 2021, 06:23 AM   #207
cbueche is offline cbueche  Switzerland
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UNSET is coming?
Not sure why we need these secondary pads. If someone wire remote sockets, the primary holes can be used, rigt ? or is this only because their large diameters makes it difficult to solder wires ?
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Old 20th April 2021, 01:40 PM   #208
hareynolds is offline hareynolds  United States
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Default Off-Board Sockets

Pads just make it easier...for example, I had an SSE configured for BOTH 6L6-family tubes AND the 6AV5 sweep tube obviously not at the same time (ie 6L6 parallel with 6AV5!). I just inserted the off-board wires alongside the socket pins.

Without the sockets in there, you do need a big glob of solder (as you point-out), but it would be a lot neater with pads.

Also handy for pulling-off test points, or using alternate fils voltages, eg 12/25v sweep tubes (although trace-cutting would be required if power and drive tubes are different fils voltages).

I used a well-abused SSE board for off-board socket experiments (see photo) but didn’t pay much attention to wiring “hygiene” (e.g tight-twisting the fils wires).

If I did this today, I’d use smaller gauge wire and route it under the board with fils wires twisted and isolated. High temp insulation (eg TEFLON or similar) is strongly recommended; hanks are available on FleaBay.
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Old 21st April 2021, 01:27 AM   #209
Tubelab_com is offline Tubelab_com  United States
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Quote:
Originally Posted by cbueche View Post
Not sure why we need these secondary pads. If someone wire remote sockets, the primary holes can be used, rigt ? or is this only because their large diameters makes it difficult to solder wires ?
They are not secondary pads. The SSE, TSE-II, and SPP boards have their tube sockets connected as the schematic shows. This restricts their use to a fairly narrow range of tubes. The SSE uses any of several common audio tubes that happen to have the same pin configuration. The TSE and TSE-II uses 4 pin tubes, most of which have the same pin configuration. The SPP however can use only EL84's and 6CW5's. There are dozens of other 9 pin tubes that can work in that design, but using them requires hacking up the PC board to change it's wiring.

Octal based TV sweep tubes come in an enormous combination of non compatible pin configurations. The UNSET can also work with non sweep tubes. I had one running with KT88's. This makes for either a large selection of different boards, or some method for user configuration.

One of the many long delays with the UNSET board was arriving at the current method of making the board useful with nearly any octal tube. The current method has a pair of octal sockets on the board with each pin connected only to the pad on the board right next to it. During the build process jumper wires are used to configure it for a given tube pinout. The grids and cathode are jumpered to the horizontal busses running across the board, while the heaters are jumpered to the pair of vertical busses running between the output tubes.

To use the board with remote output tube sockets, the board mounted sockets are left out and the remote sockets are wired to the most convenient pad on each bus.

The output tubes and driver tubes have their heater circuits isolated from each other so that different heater voltages can be used.
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Old 21st April 2021, 10:55 AM   #210
cbueche is offline cbueche  Switzerland
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UNSET is coming?
Georges thanks for the clarification ! This is an astucious design and i look forward to build an UNSET in my future. After my move is sorted out, and the other 2 SSE I have on the bench are finished.... oh and the 2 pairs of speakers in back-order... To many interesting projects, too little time.
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