Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › SOHA II Builders Thread
New Posts  All Forums:Forum Nav:

SOHA II Builders Thread - Page 4

post #46 of 1676
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 1676
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.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
Reply
post #48 of 1676
That's looks astonishing..
I want that..
Good job...
post #49 of 1676
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.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
Reply
post #50 of 1676
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 1676
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.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
Reply
post #52 of 1676
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 1676
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 1676
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 1676
More great SOHA II Ancilliary inmpressions: http://www.head-fi.org/forums/f45/11...ml#post4941349

'Monster Bass!'
post #56 of 1676
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.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
Reply
post #57 of 1676
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 1676
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 1676
Thread Starter 
Updated the BoM on the website to include the Farnell and RS part numbers
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
Reply
post #60 of 1676
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
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › SOHA II Builders Thread