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nashbap 29th November 2020 12:03 AM

Thanks Rush. I think Toroidy sells their transformers like this. Could you provide some more detail on the kind of epoxy and bentonite clay and some mix directions? I think I might give it a try.

Begs the question, why do it as opposed to the bolt and top metal plate approach? Have you noticed any difference?


Rush 29th November 2020 03:38 AM

I do a fair amount of carbon and epoxy work on my ACAT sail boat. (Built one from scratch)

Just use any laminating epoxy, least expensive you can find for this purpose.
Mix the oil dry/bentonite clay until the mixture is as thick as can get it and still be wet. The bentonite will settle to the bottom, I use a small torch to pop the bubbles on top, after it is poured into the transformer. I just use the torch a couple of passes, don’t really need to as the Forsner bit will cut down through the hardened bubbles on top. Mostly cosmetic.

Then I use a Forsner bit to level the top for the washer, then drill the mounting hole.

I have never compared doing this with the hardware method. I just do it cause I have epoxy and oil dry on hand and higher end toroidal transformers do it.

The bentonite clay came from Cat’s Squirrel’s website about making turn table plynths. Go there and see his testing of every material anyone has ever thought of to make a plynth.


Salas 29th November 2020 03:44 AM

It bonds the transformer to stay tightly winded as new and damps any 60Hz singing better, especially not to loosen in the future I guess.

nashbap 29th November 2020 04:42 PM

Thanks Rush and Salas.

The website referenced by Rush is and Cat's squirrel is a diyaudio member.

trini 30th November 2020 05:39 PM

Maybe this is not so relevant; Mouser doesn't stock anymore the recommended leds
At least here in Europe.
I've chosen this other from Knightbright:

Am i wrong? Better ones for any reason?

Salas 30th November 2020 05:43 PM

Nothing wrong with it, electrically very close to the original. But I would rather suggest WP113IDT as closer in shape also.

ForsbackaKalle 7th December 2020 07:50 AM

2 Attachment(s)
So the DAC is up running with the triplet boards. All works so good and the harsh sound from boards with lt3045 is gone. Pleased with this solution and thanks again Salas for the great solution and all help :)

Salas 7th December 2020 09:34 AM

Congratulations for your nicely concluded build! You are welcome.

nikosokey 9th December 2020 07:51 AM

1 Attachment(s)
Here is my measurments about my Ubib, bias JFET- vgs Mosfets

Salas 9th December 2020 08:03 AM

Nicely consistent DC measurements in the various semiconductors. 560Ω degeneration resistors instead of 270Ω are for J113s instead of PF5102s we should also notice.

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