[sachu]

Quote:

Originally Posted by wiatrob /img/forum/go_quote.gif Supremely sad news - The Amp Gremlins have gotten my Sigma22 - it is nonfunctional. 'Twas working perfectly last time I put the amp away - I just got it down for one last check before casing - AC in no DC out. Try a little troubleshooting, but my op points don't match TI's PDF (42V in on a 30V trafo...) EDIT: DUH, rectified DC... I have parts for another one I think , just don't know if I have time to build it up...

man..you've got to be kidding me. That's just criminal in its timing.

Give us some info will ya...let's see if we can troubleshoot that bugger.

Quote:

Originally Posted by runeight /img/forum/go_quote.gif Oh no. I was looking forward to hearing it. Believe it or not I have never heard an EHHA.

You really need to get with the program dude. Kits are only 110$

I will ship mine out to you once it is cased up. (getting there finally)

 

[wiatrob]

Well, I decided to build up my second s22 - positive is regulating but negative is not (40V) I have yet to troubleshoot, i'll post over in the Sigma thread...

EDIT: thought there was a σ22 thread on here... back to checking things...

 

[smeggy]

man that's sucky, I hope you can get it all cleared up quick.

 

[wiatrob]

Oh, eventually it'll get sorted... just hope it's sooner..

 

[Lifthanger]

Quote:

Originally Posted by sachu /img/forum/go_quote.gif

I realize this is not the best timing, but could you tell me which common mode choke you used? I found this TKD one TDK|ACM7060-701-2PL|DROSSEL, GLEICHTAKT, 700OHM, 4A | Farnell Deutschland

4A max (I'll use two of these boards, so it'll see at most 2A) , 15mOhm and 700Ohm at 100MHz.

The other available CMCs are wound on a common toroid.

 

[wiatrob]

Cold solder joint on one of the Current limiting diodes, yippie! thanks for the good vibes, EHHA is making music again, on the board. Dare I case it?

 

[Sherwood]

Dare you let Larry say it sounds the same as his Qinpu?

 

[wiatrob]

Dare he hook up some K1000 to his Qinpu?

(Smeggy, listening to your freshly balanced K1K's now...

I passed over in to 'all these amps sound awesome + .x%" land a while ago...

Plus he won't even listen to it unless I get it into a case

 

[Sherwood]

Quote:

Originally Posted by wiatrob /img/forum/go_quote.gif Plus he won't even listen to it unless I get it into a case

Precisely. I'll listen to it either way, of course. So hey, Bill, what kind of values of "x" are we talking for our "awesome + x%"?

 

[wiatrob]

Notice that was POINTX% as in (decimal place). I have reached a point where the differences are more subtle than my ability to descern...

Conflict of interest prevents me from saying exactly how the EHHA would compare to say, a CTH. You decide tomorrow!

 

[Sherwood]

Way to recuse yourself, MOTMOTMOT.

I'll be there bright and early, covered in bells, taking pictures of embarassed nerds and their publicly-derided toys.

 

[runeight]

You know, a certain geeky designer might be there too if you wait long enough.

 

[looser101]

Quote:

Originally Posted by Lifthanger /img/forum/go_quote.gif I realize this is not the best timing, but could you tell me which common mode choke you used? I found this TKD one TDK|ACM7060-701-2PL|DROSSEL, GLEICHTAKT, 700OHM, 4A | Farnell Deutschland 4A max (I'll use two of these boards, so it'll see at most 2A) , 15mOhm and 700Ohm at 100MHz. The other available CMCs are wound on a common toroid.

It's not necessary, me thinks. I believe the original design was for a DHT tube heater.

 

[smeggy]

I still think the CTH is pretty awesome too.

 

[sachu]

Quote:

Originally Posted by Lifthanger /img/forum/go_quote.gif I realize this is not the best timing, but could you tell me which common mode choke you used? I found this TKD one TDK|ACM7060-701-2PL|DROSSEL, GLEICHTAKT, 700OHM, 4A | Farnell Deutschland 4A max (I'll use two of these boards, so it'll see at most 2A) , 15mOhm and 700Ohm at 100MHz. The other available CMCs are wound on a common toroid.

Don't worry about the choke. It is only there for filtering. Even without the choke you will have a pretty solid Heater supply there.