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SOHA II Builders Thread - Page 102

post #1516 of 1665

Intital checks for PS are ok, +15, -15 and 117 and 12.6 volts.

Was able to set up the 220 mv across R10's.

 

Unfortunatley the relay was not clicking, after a few hours of measuring one of the pins on the output of the ICE was low, not enough voltage to pick the relay.

Solder it again and the relay clicked.

 

Next problem after jumpering J3, the H+ adjust was not adjusting...checked all solder joints and the P1P has no effect on the voltage, just sits there at max voltage.

 

Seems their are no shorts or opens, circuit checks out ok, I have ordered another TL873 and hope this fixes that.

 

Alex

post #1517 of 1665

Dunno if anyone checks in with this thread or not, but here goes. This is what I get for fooling with

something that's working.

 

I went back to check voltages, etc. and the voltage across R6L is being weird. It'll check fine, then

go to 0, then jump up to 14V. The relay clicks on and off sometimes when I touch my probes to

R6L. The other side, R6R is fine. Tried switching tubes. No change. BTW, I'm sure I didn't short

anything with my probes.

post #1518 of 1665

 

Well, it seems as if P1L has gone south. Mostly, it reads zero ohms at different settings.

So, my next question is, did I damage anything else running 14V through the tail current curcuit?

post #1519 of 1665
Is SOHA II out of vogue now? This thread seems pretty dead.

I have been trying to get the kit from GJA for weeks, but Jeff is unresponsive. Anyone dealt with him lately? He used to respond and ship fast.
post #1520 of 1665
Quote:
Originally Posted by Navyblue View Post

Is SOHA II out of vogue now? This thread seems pretty dead.

I have been trying to get the kit from GJA for weeks, but Jeff is unresponsive. Anyone dealt with him lately? He used to respond and ship fast.


 

It could be possible that your email is going into Jeff's junk box?

post #1521 of 1665
It's possible I guess, the first time I mailed him he didn't reply for a week or so. The second time I used the webform and he replied almost immediately, but when I replied back and re send the mail a few times he hasn't responded for almost 2 weeks . I just tried the webform again and we'll see.
post #1522 of 1665
Quote:
Originally Posted by Navyblue View Post

It's possible I guess, the first time I mailed him he didn't reply for a week or so. The second time I used the webform and he replied almost immediately, but when I replied back and re send the mail a few times he hasn't responded for almost 2 weeks . I just tried the webform again and we'll see.


i actually emailed him maybe 3 or 4 weeks ago asking about pricing for the soha II kits. he emailed right back within a few hours. you must have ended up in his junk box.

post #1523 of 1665

I got a reply today.He got my replies, I guess he was swamped. But he remembered me and he billed me right away. I guess I'll get busy soon. :)

post #1524 of 1665

Question:

 

If I put the transformer at a separate enclosure as the amp, can I ground the amp enclosure to the signal ground instead of the mains ground?

 

I don't see this mentioned in the website. Thanks. smily_headphones1.gif

post #1525 of 1665

People?

post #1526 of 1665

Yes, you can.

 

Generally you would use a ground loop breaker if everything is in the same chassis.

post #1527 of 1665

If I put the transformer at a separate enclosure as the amp, can I ground the amp enclosure to the signal ground instead of the mains ground?

 

I'm doing exactly that for my EHHA, as I've done for most of my other 2-box builds (see links in sig), which is what you are suggesting.  Along the lines of Wiring & Ground - "Option 2" here:

http://www.amb.org/audio/beta22/

I see no reason, e.g. schematics, that this approach would not work & be beneficial for a SOHA II build.... Perhaps someone who's done this will chime in.


Edited by cfcubed - 8/23/11 at 1:40pm
post #1528 of 1665

Thanks guys, I really appreciate it. :) I am a bit anxious that if I ran into problems and this design is "forsaken".

Yep the Beta 22 page was my reference as well, and that's how I built mine. Since SOHA II uses a higher voltage, I thought may be there are other reason to mains ground the enclosure. Glad to know that there will be no problem.


Edited by Navyblue - 8/23/11 at 10:10pm
post #1529 of 1665
Anybody can tell me if there is a good DC filter in this design because i bought a diy Soha II made by another headfier and it seems to be picked DC a lot. With my double online conversion ups. The humming is a lot less audible

there might be other source of noise. I will have to verify everything frown.gif

would this work
LC audio diy DC filter

Also anybody feel the Soha II soundstage to be too wide. I find it very very weird with my DT250 compare to my others amps.
I can position the instruments better but they are all over my head in a weird way..

Also mids are detailed but kinda harsh...

Also anybody can tell me if in the SOHA II the Toroidal transformer should be mounted.. mine isnt and maybe its causing interference or something...
Edited by sinae - 8/28/11 at 3:18pm
post #1530 of 1665

Guys,

 

As for using boutique stuffs on C1, would tombstone mounting, or air wiring cause any instability to the circuit?

 

I intend to air wire C1 to another board where I can mount and roll capacitors but not sure if it would cause any harm.

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