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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 4th April 2020, 12:51 AM   #1
dwinstonwood is offline dwinstonwood  United States
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Default Six Year SSE Project Nearing Completion

Hey everyone,
On 4/14/2014 I purchased a Tubelab SSE board from George.
Well, I've finally gathered every last part I need to to finish this project!

For me, by far the biggest hurdle - so far - was the chassis. My hobby budget doesn't permit a custom fabricated job; I had to go with a $36 Hammond and do all the cutting myself. Using a stepped bit, various files, and sandpaper I ended up with a chassis I'm happy with. I intend to paint it tomorrow with self-etching primer and textured paint (too many imperfections for a smooth, gloss finish).

Here are a couple of photos...
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File Type: jpg chassis-01.jpg (324.7 KB, 322 views)
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Old 4th April 2020, 12:58 AM   #2
dwinstonwood is offline dwinstonwood  United States
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I'll be using Tung-Sol EL34B's, a Tung-Sol 12AT7W, and a Sovtek 5AR4.

I swapped out the original 560 ohm R17 and R27 resistors for 680 ohm parts, following George's suggestion.

Edcor XPWR035 and two GXSE15's.
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Old 4th April 2020, 09:35 PM   #3
dwinstonwood is offline dwinstonwood  United States
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Rustoleum self-etching primer and textured paint.

I bought a piece of oak at Lowe's for the sides. I still need to bevel the edges with a router and stain them.

Lots of little imperfections in the finish - spray cans always spatter for me - but, it's good enough!
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Old 5th April 2020, 02:09 AM   #4
Duke58 is offline Duke58  United States
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Looks good so far. Did you build the chassis first, then put together the PCB?
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Old 5th April 2020, 12:44 PM   #5
dwinstonwood is offline dwinstonwood  United States
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Thanks Duke58. No, I assembled the board back in 2014. I just got around to ordering the Edcors last summer, and bought the Hammond chassis a few months ago.

A couple of moves, new jobs, and life priority changes have caused me to shelve this project more than once over the last six years.

The next step, that I'll work on today, is removing the thick blue paint from some of the Edcore mounting tabs.

So, here's an important question: Is it better to have all four mounting tabs on each of the three transformers (12 total points) make a bare metal contact with the chassis, or, should I just ground one tab on each of the transformers to the chassis?

Thanks!
David
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Old 5th April 2020, 01:49 PM   #6
spendorite is offline spendorite  Canada
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Quote:
Originally Posted by dwinstonwood View Post
The next step, that I'll work on today, is removing the thick blue paint from some of the Edcore mounting tabs.

So, here's an important question: Is it better to have all four mounting tabs on each of the three transformers (12 total points) make a bare metal contact with the chassis, or, should I just ground one tab on each of the transformers to the chassis?


Use tooth washers.

I never scraped any paint from my Edcors mounting tabs.
I use tooth washers at the top over the tabs and at the bottom under the
chassis plate. After this I thoroughly check to ensure continuity from the
laminations to the chassis and to the ground pin on the power input IEC.
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Old 5th April 2020, 02:31 PM   #7
dwinstonwood is offline dwinstonwood  United States
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Thanks spendorite!
So, you literally touch one multimeter probe to the black laminations of the transformer, and the other to the chassis and IEC ground pin?
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Old 5th April 2020, 03:21 PM   #8
spendorite is offline spendorite  Canada
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Yes, however the laminations are mostly coated so you'll have to probe until the
probe touches a spot where there is bare metal, if not just make a small scratch to
get a bare metal contact. Of course I'm sure you already understand that the IEC
ground pin must be connected to your star ground or other suitable ground point
on the chassis.
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Old 5th April 2020, 03:47 PM   #9
Duke58 is offline Duke58  United States
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I didn't scrape off any paint from the transformer tabs, either.

Make sure your star ground is touching bare metal and it'll sound fine. The SSE is well documented on the Tubelab website, so follow the grounding scheme.
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Old 5th April 2020, 05:45 PM   #10
dwinstonwood is offline dwinstonwood  United States
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Location: Nawth-Side o'the Rivuh
Thanks both of you! Very much appreciated. Yes, I am following the Tubelab grounding scheme.

With my poor eyesight and slightly shaky hands, soldering this sub-assembly was a challenge. But, everything checks out with the multimeter.

I just used shielded cable from an old RCA interconnect. I designed my chassis layout so that my signal wires are as short as I could make them within reason.
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