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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 5th April 2020, 07:45 PM   #11
dwinstonwood is offline dwinstonwood  United States
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The shielded wire proved too brittle. I rewired with better stuff.
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Old 5th April 2020, 10:04 PM   #12
dwinstonwood is offline dwinstonwood  United States
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Temporary mock-up. Nothing's connected up yet.

I was aiming for a clean and compact build.

Man, I hope it works!
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Old 6th April 2020, 06:04 PM   #13
cogitech is offline cogitech  Canada
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Six Year SSE Project Nearing Completion
Looking great so far!

I am hoping to complete my SSE build soon, and I had the same question about the transformer tabs. Seems to me metal-to-metal contact is required so the transformer chassis are grounded to the top plate (and top plate is connected to EIC ground) for safety reasons. The tooth washers apparently accomplish this by biting through the paint. I hadn't thought of that, so thanks to spendorite for that!
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Old 6th April 2020, 07:35 PM   #14
randytsuch is offline randytsuch
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Six Year SSE Project Nearing Completion
I used a wire brush drill attachment I have, made it very easy to remove the paint from the bottom of tabs. But I'm sure tooth washers would be fine.
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Old 6th April 2020, 10:03 PM   #15
dwinstonwood is offline dwinstonwood  United States
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Like most of us, I've got plenty of stay-at-home time on my hands, so I went ahead and removed the paint from the tabs.

I also decided it couldn't hurt to allow a bit of ventilation in the chassis, so I drilled holes in both sides for what it's worth. Now I can run the router over the edges and stain/seal the wood.
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Old 7th April 2020, 01:51 PM   #16
cogitech is offline cogitech  Canada
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Nice. The holes in the sides will help a bit. It looks like there is a bit of a gap between each tube socket and the top plate, so the "chimney effect" from the tubes (and the convective current of heat rising from the board components under the top plate) will tend to create air flow through the gaps. The resulting slight negative pressure will draw fresh air into the chassis through any holes. To enhance this effect, some builders drill a pattern of holes around each tube socket. An extreme application of this principal is described by Morgan Jones, in his book "Building Valve Amplifiers":

Six Year SSE Project Nearing Completion-fan_guard-jpg
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Old 7th April 2020, 02:13 PM   #17
dwinstonwood is offline dwinstonwood  United States
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Thanks cogitech!

Yes, when I drilled the holes for the tube sockets I wasn't sure what length of hex standoffs I would be using to mount the board, so I made the holes large enough for the sockets to clear the chassis in case they protruded out of the top (or, if the tube bases needed to extend into the chassis). I ended up using 1/2" standoffs and the sockets sit just barely beneath the chassis. So, as you said, this does allow enough space for air to flow up and out which should pull fresh air in through the holes... a convection system as you aptly described it!

The MakerSpace where I work is obviously closed for now, but if I ever do another chassis in the future I will use their laser to cut radial slots around the socket holes, as some folks do. I think that effect looks great.

David
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Old 7th April 2020, 09:33 PM   #18
dwinstonwood is offline dwinstonwood  United States
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I'm just doing small stages at a time, so as not to get ahead of myself.

It was easier to wire up the star ground leads before I mount the board or transformers.

The ground is on one of the choke mounting bolts. After I install the choke I'll go back and put more solder on the nut and eyelet. I might add a piece of heat-shrink tubing for stress relief, too.

The four wires are from: one of the RCA ground tabs, the IEC ground lug, and the two loose wires will attach to the black speaker-terminal binding posts along with the two appropriate OPT wires.

I'm pretty sure I haven't missed anything else that needs to be attached to the star ground. But, I welcome all comments and suggestions. Thanks.
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Old 8th April 2020, 02:10 AM   #19
dwinstonwood is offline dwinstonwood  United States
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Hi, I have a basic question concerning the OPT hookup for triode mode without CFB.

Looking at the Tubelab diagram I've attached, do I jumper the plate wire (blue on my Edcors) into the UL connector?

Also, do I jumper the CFB connectors, too?

I'm just not 100% certain I'm reading the diagram correctly. If anyone has a photo of an actual board wired this way that would be great.

Thanks!
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Old 8th April 2020, 01:32 PM   #20
cogitech is offline cogitech  Canada
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Six Year SSE Project Nearing Completion
Yes, you are reading the diagram correctly re: jumpers.

Grounding scheme looks complete to me.
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