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SOHA II Builders Thread - Page 4

post #46 of 1669
I just finished my SOHA II, Very nice build, sounds great, a definite step up from my SSMH. now I need to save for HD600's.
Has anyone else noticed that the excel BoM is missing P1P, the pot to adjust the high voltage? Luckily I had one that would work.
post #47 of 1669
Thread Starter 
Congrats on the build grendel. How did you do the texture on the panels? They look like the Hammond panels that you have worked over. Yes?

I didn't notice the missing pot. So I guess I'd better add it.

Let us know how it does after a while of listening.

Also, if you have a mind to you can add a small access hole for the B+ pot on the top panel and you can actually adjust the B+ while you're listening to find a spot that you like best.

Have you rolled any tubes yet? Etc.
post #48 of 1669
That's looks astonishing..
I want that..
Good job...
post #49 of 1669
Thread Starter 
Yes, I agree. It's pretty amazing.

I have updated the Excell BoM with Mouser and Digikey part numbers but not Farnell and RS numbers. Thanks for catching that grendel.
post #50 of 1669
I used rust-oleum copper hammertone paint. I didn't expect the birdseye effect, but I like it.
I used a mill to drill the holes in the top, if the spacing wasn't perfect, it would look like crap.
I only have 5963 tubes so far, but will obtain others to try.
I am currently running B+ at 90V, does that adjustment make a big difference in sound?
I have only listened for a few hours, but I am impressed so far. I am running with an Alien DAC and SR80's, but HD600's and a gamma DAC should make it sing.
Does anyone have recommendations for other tubes to try?
post #51 of 1669
Thread Starter 
It's hard to say on the B+ as there are so many different ears out there. My wife likes the original B+ of 60V. I can't really hear much difference between 60V and 100V. But others can and it may be different for different tubes.

I've tried quite a few tubes in mine and I like the RCA 5963s the best. I think you should try ordinary 6922s and 12au7s just to see the differences. dBel84 and others like the 8416 the best.
post #52 of 1669
All, please see some impressions from this weekends meet - not in depth, for a mini-meet there was a LOT of gear, but the SOHA II is featured...

http://www.head-fi.org/forums/f45/11...s-pics-377603/
post #53 of 1669
Quote:
Originally Posted by runeight View Post
It's hard to say on the B+ as there are so many different ears out there. My wife likes the original B+ of 60V. I can't really hear much difference between 60V and 100V. But others can and it may be different for different tubes.
I recently rolled the B+ back down to 60, for 'old times sake' although I thought I noticed a difference before, I can't tell as much now..
post #54 of 1669
Quote:
Originally Posted by runeight View Post
Yes, I agree. It's pretty amazing.

I have updated the Excell BoM with Mouser and Digikey part numbers but not Farnell and RS numbers. Thanks for catching that grendel.
P1P 10K 3/8" Trimmer
Farnell Part No 9353186 (Bourns 3296W series)
Rapid Part No. 68-1946 (3296W equivalent - TruOhm series)

UB

PS. my pcb arrived today
post #55 of 1669
More great SOHA II Ancilliary inmpressions: http://www.head-fi.org/forums/f45/11...ml#post4941349

'Monster Bass!'
post #56 of 1669
Thread Starter 
Quote:
Originally Posted by Uncle Bob View Post
P1P 10K 3/8" Trimmer
Farnell Part No 9353186 (Bourns 3296W series)
Rapid Part No. 68-1946 (3296W equivalent - TruOhm series)

UB

PS. my pcb arrived today
Thanks Uncle Bob. I'll upload the new spreadsheet tonight.

Keep us posted on the build.
post #57 of 1669
Quote:
Originally Posted by wiatrob View Post
More great SOHA II Ancilliary inmpressions: http://www.head-fi.org/forums/f45/11...ml#post4941349

'Monster Bass!'
Bass quality is no doubts a major positive character of this amp.
No matter if I plug in a Philips HP 1000, AKG K 701, Beyer DT 880 (2005) or Sennheiser HD 600, always deep, controlled and very well defined. However I like it most with Sennheiser HD 600.
post #58 of 1669
wiatrob,

a bit OT, but any direct comparisons with DV, WA6, etc.? Saw some mention relative to EF-1, but not much relative to the other amps present.

Did you personally get to compare to the SSMH? I have my own opinion, owning both, but am interested in hearing others.

Which tube and transistors are you using? I do know the sonics differ drastically with tubes and slightly with transistors, so you can definitely dial down or up certain areas.

Looks like a fun meet.
post #59 of 1669
Thread Starter 
Updated the BoM on the website to include the Farnell and RS part numbers
post #60 of 1669
Quote:
Originally Posted by runeight View Post
Updated the BoM on the website to include the Farnell and RS part numbers
For what it's worth, the Digikey P/N for the pot is 3296W-103LF-ND
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