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What DIY Amps are available for Stax?
What DIY Amps are available for Stax?
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Old 5th September 2019, 08:40 PM   #11
agent.5 is offline agent.5  United States
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I found these:

the STAX Amplifier
the STAX Amplifier

It seems to be just regular SE amps, with appropriate output transformer.

Last edited by agent.5; 5th September 2019 at 08:55 PM.
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Old 6th September 2019, 07:06 PM   #12
hpeter is offline hpeter  Slovakia
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it was inspiration for me, but really its just 2 basic stages. it cant go simpler than that.

however over time i did some improvements..see my blog.
so easy, with gains close to phono pre.
__________________
..BLOG.. XMOS_U8/PCM5102A > LL1544A > 6H9C+gyrator > 2A3_SOV/JJ > LL1660 > STAX SR207 _ SR L300 _ SR007 # LL2748 > 394A > LC 12H/1000 // 4-125a test
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Old 6th September 2019, 08:39 PM   #13
JimmyC23 is offline JimmyC23  United States
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I don't own a Stax but if I did, it would be the 009s with a Stax DIY SRM-T2.

The ultimate DIY? A Stax SRM-T2! - Do It Yourself - www.Head-Case.org
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Old 7th September 2019, 01:31 AM   #14
agent.5 is offline agent.5  United States
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Quote:
Originally Posted by JimmyC23 View Post
I don't own a Stax but if I did, it would be the 009s with a Stax DIY SRM-T2.

The ultimate DIY? A Stax SRM-T2! - Do It Yourself - www.Head-Case.org
Is there a schematic? That thread on head case links to many files that are no longer available. I googled and saw some pictures of stuffed circuit boards, and it appears to be an otl push-pull design, with op amps, guessing to be constant current source feeding the tubes. Bi-polar regulated power supply, it seems.

I am not brave enough to buy a 009 without extensive Stax experience. But I think I can start with a L300 or L500.

Last edited by agent.5; 7th September 2019 at 01:43 AM.
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Old 7th September 2019, 01:39 AM   #15
agent.5 is offline agent.5  United States
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Quote:
Originally Posted by hpeter View Post
it was inspiration for me, but really its just 2 basic stages. it cant go simpler than that.

however over time i did some improvements..see my blog.
so easy, with gains close to phono pre.
I read your update. I guess for new builds, you have changed your suggestion to using LL1677 (for JJ 2A3-40) instead of LL1660? I may just do that as I have a quad of JJ 300B sitting idle, and those JJ 2A3-40s basically are just JJ 300B tubes with 2.5V filaments.
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Old 8th September 2019, 02:01 PM   #16
hpeter is offline hpeter  Slovakia
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i still use the ll1660/18ma
i do not have 1677, probably never will since i switch sovteks and jj. at moment. been also thinking about eml 2a3 meshes....one day...

as i can tell, one of biggest improvements were the gyrators for drivers. latest update really pops the microdetails. (jfet+ledpv bias fet)
ecc83+ra was too much muffled. it seems the 2a3 capacitance was interfering too much.

i found out that stax you can add some bass. i wrote a more at headfi.
good or bad seal makes bass weak, but if you find the spot in between.....microfoam selfadhesive roll for sealing windows
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..BLOG.. XMOS_U8/PCM5102A > LL1544A > 6H9C+gyrator > 2A3_SOV/JJ > LL1660 > STAX SR207 _ SR L300 _ SR007 # LL2748 > 394A > LC 12H/1000 // 4-125a test

Last edited by hpeter; 8th September 2019 at 02:04 PM.
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Old 11th September 2019, 02:28 AM   #17
thuanth43 is offline thuanth43  Viet Nam
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Quote:
Originally Posted by JimmyC23 View Post
I don't own a Stax but if I did, it would be the 009s with a Stax DIY SRM-T2.

The ultimate DIY? A Stax SRM-T2! - Do It Yourself - www.Head-Case.org
For real
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