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post #1486 of 1665

try different tubes.

post #1487 of 1665

^^ agreed...However i doubt if you will find a permanent solution to this as i feel it is rather normal. Besides, I never listen to my amps tube or not for the first half hour..they need to warm up to their operating temperature. All my amps sounds very different and more to my liking after a good warm up period. 

post #1488 of 1665

Thanks holland and sachu for your advice.

 

Changing the tubes was the first thing I tried when the noise appeared. It's still there regardless of the type or the brand of the tubes.

Quote:
^^ agreed...However i doubt if you will find a permanent solution to this as i feel it is rather normal. Besides, I never listen to my amps tube or not for the first half hour..they need to witwarm up to their operating temperature. All my amps sounds very different and more to my liking after a good warm up period.

 

I do the same sachu, that's why it doesn't bother me much, guess that I could just live with it.

 

Thanks!!!! wink.gif

post #1489 of 1665

Alcaudon,

you didn't qualify the noise you are having in your SOHAII...is it some crackling, rustling noises during warm up or hiss or hum...?

 

Tubes do sometimes generate noise when warming up... all the inner structures heating up, expanding and such. I've had that happen with an EZ81 rectifier and one 6H30 that made some random popping noises in the first minutes that I couldn't get rid off.

Only when I bought a new pair...wink.gif

 

But you already tried new tubes, so maybe you can be a bit more specific about the kind of noise your SOHA emanates...

post #1490 of 1665

 

TH    +12.56v

TL+   +14,97v

TL-    -15,14v

TB+ +119.6v

 

Are these acceptable values?

How can I fine tune them?

 

J1,J2,J3 are NOT strapped.

Tubes NOT installed

HTR jumpers NOT installed.

post #1491 of 1665
post #1492 of 1665
TL+ +15V
TL- -15V
TH -12.6V
TB+ +103V to +125V

 

 

12,56v is close enough to 12,6v.

14,97v is close enough to 15v.

I was wondering if 119,6v is close enough to 125v

and is 15,14v close enough to 15v?

 

And how do I reach 125v across TB+ ?

post #1493 of 1665
Quote:
Originally Posted by egotrip View Post

TL+ +15V
TL- -15V
TH -12.6V
TB+ +103V to +125V

 

 

12,56v is close enough to 12,6v.

14,97v is close enough to 15v.

I was wondering if 119,6v is close enough to 125v

and is 15,14v close enough to 15v?

 

And how do I reach 125v across TB+ ?


TB+ is a range where it should lie.  Needless to say, but I will anyway, is that if you are *in* the range, you are fine.

 

 

 

Quote:
The voltage at TB+ will be close to 125V when the tubes are not installed and will pull down to near 103V when they are.

Edited by holland - 1/6/11 at 12:27pm
post #1494 of 1665

That is great :D

 

Has been a bit jumpy after i blew up my caps and lv- after a series of reversed diodes ;)

post #1495 of 1665

Yeah, been there done that...rolleyes.gif

 

You remember what I said...?

In the end you will be very proud of your new amp and probably not wait too long until you go for the next one...

post #1496 of 1665
Quote:
Originally Posted by stixx View Post

Yeah, been there done that...rolleyes.gif

 

You remember what I said...?

In the end you will be very proud of your new amp and probably not wait too long until you go for the next one...

 

Yeah. I remember. :)

Just strapped all the jumpers, all values seems ok.

Tubes light up.

Some crackeling from the volumepot. (it is not soldered due to casing, so the crackeling is due to loose pot)

Taking the night off, and will try to connect a source tomorrow, after i have double checked the voltages.

 

Getting really exited.

post #1497 of 1665

Soha II

Chassis

 

Some work left, but coming together.

I am no woodsman, either a designer.

post #1498 of 1665

 

Quote:
I am no woodsman, either a designer.

But the woodwork is looking very good!  What kind of wood is that...?

post #1499 of 1665

Pretty.  A nice urethane coat and it should look really nice.  Did you build the case yourself?

post #1500 of 1665

Wallnut hardwood.

I will coat it when i have drilled all the holes and fittet all the parts.

I was thinking of using a charcoal transparent lack to highlight the wood, and then a few clearcoat.

Yes I have sort off made the case myself.

The aluminiumtop is cnc machined by "professionals" but the autoCAD drawing is mine.

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