Iron Pre Essentials Kits For The DIYA Store - Register Your Interest

[Zen Mod]

and rest of question?

 

[MEPER]

I do have an issue…when I have a source connected and volume maxed there is some hum. Ground loop, right?

No source connected = no hum

I can see that you have two/three different ground connections to chassis?
One for the mains and one for each PCB?
I think better to have just one chassis screw and connect using two wires from PCBs to same screw......but not sure that it will cure your hum.
I have no hum in my SE version 🙂

 

[Vunce]

@KevinHeem

Do the transformers center bolt touch the baseplate? If so, it's possible you have a transformer Shorted Turn.
imgres

 

[KevinHeem]

are those cables, routed to vol pots, coaxial?

No, I’ll get those changed out.

 

[Zen Mod]

there is your hum, and it'll go

 

[Toadroller]

View attachment 1200158View attachment 1200159View attachment 1200160View attachment 1200161View attachment 1200162View attachment 1200163

I am always impressed by people who can lay out neat wiring and plumbing. Wow.

I’ve been working my SE into a scavenged chassis. I was able to do a quick signal test this morning and it amplifies.

 

[william2001]

@KevinHeem

Do the transformers center bolt touch the baseplate? If so, it's possible you have a transformer Shorted Turn.
imgres

It has the plastic grommet they give you with those covers. No shorted turn there. I have a couple of them myself.

 

[twocents]

Is that measured under load? It's common for transformers to measure higher than the nominal voltage on the bench, with no load.

Just to confirm - measured with no load. I was just hesitant to connect it (to my precious IP board) with measurements that differs so much from the specs. Also hesitant to mention that in my 7 years of diy this is my first time using and connecting a toroid. But all is well so far. Thanks for all the support.

 

[andynor]

there is your hum, and it'll go

Naaah. I bet the root cause is a design issue

 

[Zen Mod]

 

[chromenuts]

LOL…yes as with all of ZM’s designs hum is included free of charge as part of basic package.

This is all part of his scheme to make himself the most indispensable member on DIYAudio! 😂😂😂

 

[Toadroller]

Many hours later, after some automotive mechanical endeavors, some golf range, some house work…

I got volume, select-o-switch, and one channel all wired up and tested.

SE is alive! Look, knobs!

 

[Toadroller]

Next up is wiring other inputs, cutting a hole for the power switch, and rigging switcheroony Christmas lights.

Then putting the cover on.

 

[Zen Mod]

those BD and IRF are protruding, as Towers of Doom



twist those twisted pairs tighter, to make them less aware of each other

and avoid routing pot wires along with output wires

 

[Toadroller]

But knobs, Zen! Knobs!

Even open chassis and pot + output wires, there isn’t a hint of hum or hiss. Kudos.

Will tighten things up. Later. Right now it’s time to listen.

 

[ItsAllInMyHead]

Keep on rollin', Toad! 🙂

 

[32y0]

Will there be another run?

 

[ItsAllInMyHead]

Very soon...

 

[arthur]

Why can't treat this pre-orders like the usual Group Buy, no first come first serve ....

 

[Vunce]

It has the plastic grommet they give you with those covers. No shorted turn there. I have a couple of them myself.

Nice little covers, I will have to get a couple. Thanks 😉