For secondary, do you worry about the Power Transformer Polarity? I have seen someone talk about it but not sure how to find out the correct polarity on Edcor. Not sure if its' important.
As far as I know, AC has no polarity. It does have "phase", but given we are converting the high voltage to DC etc., I don't see how that would ever be a concern. The output transformer absolutely has a polarity, the red is B+, the blue goes to the plate and the white/blue is the screen/UL tap.
@@SkunkieDesignsElectronics Great, as long as you have built amps before and work great, then I don't have to concern about it. I couldn't remember where I read that but I think with correct polarity would give the amp a few sensitivity dB but won't affect the sound.
Had a thought regarding transformer grounding while while I was watching this... Are the transformers safety grounded in any way? It seems the powder coating of the end bells and chassis would insulate them from the chassis safety ground...providing an opportunity (however remote) to become live due to an internal failure. Just wondering before I get started with my construction. Appreciate your thoughts & info!
You would need to remove the powder coating from: the lamination surfaces, the inside surfaces of the end bells, the bottoms of the end bells and also the top of the chassis. I've never seen anyone do any of this kind of thing, I'm not concerned.
Your standoff leg can be used as a star ground by running a wire from the standoff leg to the original star ground. Never a good idea to use the chassis as a ground.
Nice cliffhanger at the end 😀. And again lots of interesting details. Must be a lot of work to edit this video’s. Thanks!
Thanks, trying to keep them interesting :)
Nice job indeed ! You can also put a solder joint between the chassis and the bube socket ( with a big and hot iron tip )
Yeah, for the brave :) Thanks for the tip, that probably is a good idea if you can do it.
For secondary, do you worry about the Power Transformer Polarity? I have seen someone talk about it but not sure how to find out the correct polarity on Edcor. Not sure if its' important.
As far as I know, AC has no polarity. It does have "phase", but given we are converting the high voltage to DC etc., I don't see how that would ever be a concern. The output transformer absolutely has a polarity, the red is B+, the blue goes to the plate and the white/blue is the screen/UL tap.
@@SkunkieDesignsElectronics Great, as long as you have built amps before and work great, then I don't have to concern about it. I couldn't remember where I read that but I think with correct polarity would give the amp a few sensitivity dB but won't affect the sound.
Had a thought regarding transformer grounding while while I was watching this... Are the transformers safety grounded in any way? It seems the powder coating of the end bells and chassis would insulate them from the chassis safety ground...providing an opportunity (however remote) to become live due to an internal failure. Just wondering before I get started with my construction. Appreciate your thoughts & info!
You would need to remove the powder coating from: the lamination surfaces, the inside surfaces of the end bells, the bottoms of the end bells and also the top of the chassis. I've never seen anyone do any of this kind of thing, I'm not concerned.
@@SkunkieDesignsElectronics Makes sense. Thanks!
I know this has nothing to do with this video, I think it would be so cool to build a vt137 / 1626 tube buffer, I will keep my fingers crossed 🤞
I have some tube buffers planned in the future!
Does the gauge of the wire matter when building these amps? Is 16AWG adequate?
I use 18ga solid and even that is overkill, but I like how it holds it's shape. Make sure the insulation voltage is rated high enough too.
Your standoff leg can be used as a star ground by running a wire from the standoff leg to the original star ground. Never a good idea to use the chassis as a ground.
Great 👍 , Hope you get my email that I send to your website 😀 👍
Got it!