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SOHA II Builders Thread - Page 33

post #481 of 1686
Quote:
Originally Posted by lacrossebowe8 View Post
What B+ are most people using?
I've gone back and forth between ~60 and 90V. There was an impression from the Designer that the original B+ offered someting special in the character of sound - but as soon as the new HVPS was designed, I (and I think about everybody else on the proto team!) dialed it to '11.'

I did not notice a lot of difference between plate voltages with the new PS, I've been at ~90V...

-Bill
post #482 of 1686
I got my board from Jeff, transformer from Avil, and a nice big box from Mouser. I thought I might get my tubes today, but it looks like they will come on Monday.

So I have enough parts to start building the amp, but I have to leave town tomorrow morning

oh well, I guess I get to build it next weekend.

/e wanders off humming "Waiting is the Hardest Part".
post #483 of 1686
For those who would like to mount LED’s under the tubes of your SOHA II, but hate the cumbersome wires running under the PCB, this can be interesting. The pic below showing how it was implemented on my build.





Have fun with your build!
post #484 of 1686
Really nice Ferrary!!!!

So, with this implementation you won't be catching any hum from the leds as some people has mentioned?
post #485 of 1686
Quote:
Originally Posted by Ferrari View Post
For those who would like to mount LED’s under the tubes of your SOHA II, but hate the cumbersome wires running under the PCB, this can be interesting. The pic below showing how it was implemented on my build.

http://i72.photobucket.com/albums/i1...eelding597.jpg


Have fun with your build!
How come you wired them different? I see the one on the right is tied into the heater circuit, but I can't see where the one on the left is grounded to.
post #486 of 1686
Quote:
Originally Posted by Alcaudon View Post
Really nice Ferrari!!!!

So, with this implementation you won't be catching any hum from the leds as some people has mentioned?
I have never experienced hum/noise caused by LED's on my amps.
I prefer doing it this way mainly to keep things as clean as possible (one of my personal rules).

My guess is that the hum some people have, is due to using (too long) unshielded wires for sensitive signals paths, which invites interferences. Also wires carrying DC voltage (-12.6V) running under the PCB, too close to the sensitive traces can be a source of problem.
post #487 of 1686
Quote:
Originally Posted by Hayduke View Post
How come you wired them different? I see the one on the right is tied into the heater circuit, but I can't see where the one on the left is grounded to.
Both LED’s are connected the same way: feeding by the same -12.6V heater voltage circuit via a 1KΩ resistor, while the anode connected to the same ground.
post #488 of 1686
All I need is the trofo now...

post #489 of 1686
Sweet, looks like you'll be busy
post #490 of 1686
Quote:
Originally Posted by Uncle Bob View Post
Sweet, looks like you'll be busy
Yep if I can find the time or should I say if the missus doesn't find something else for me to do!!

Any more news on your build?? is it cased up yet?
post #491 of 1686
Quote:
Originally Posted by onform View Post
All I need is the trofo now...
... and a nice enclosure.
Are you going to use the stock Hammond or do you have something else in mind?
Have fun with your build!
post #492 of 1686
Quote:
Originally Posted by Ferrari View Post
Also wires carrying DC voltage (-12.6V) running under the PCB, too close to the sensitive traces can be a source of problem.
Yep, that was my problem. Wires running under the PCB with 1/8" spacers. My LEDs were always meant to be temporary, as my amp is fully enclosed (tubes and all) so LEDs made no sense as well.

You've got a good wiring scheme there.
post #493 of 1686
Quote:
Originally Posted by onform View Post
Yep if I can find the time or should I say if the missus doesn't find something else for me to do!!

Any more news on your build?? is it cased up yet?
My build has been running for a few weeks but is not yet cased up. I'm still keen on the HIFI2000 case but I've been putting off buying because of the euro exchange rate. It would seem that there's no short term prospect of that improving, so I'd better get my order in before it gets any worse!
post #494 of 1686
I purchased this one back when I first said I was going to get the kit so I gained there...

post #495 of 1686
Ooh, one of my favourite! I have used that enclosure a while back too.
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