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Old 14th September 2011, 11:28 AM   #51
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by generg View Post
Besides the stinking name, , Darmstadt has wonderful woods indeed.............
better that than Schweifurt



regarding tests - you can compare BA3 FE with follower type amp/output vs. regular amp strictly in informative purposes ;

too much gain in system with former...... ( waste of signal energy )
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Last edited by Zen Mod; 14th September 2011 at 11:32 AM.
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Old 14th September 2011, 11:51 AM   #52
generg is offline generg  Germany
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oh, I know Zen Mod....

I had only a 10k pot before

- Semisouth Mu follower solution with 20db (not really Babel J2, but a modified version, to be absolutely correct)

and

- BA-3 combined with (special crippled) F4

@tea-bag: the difference in loudness is small between BA-3 amplification and the 20 db of SemiSolution.....so no problem to use it as a pre too....

and you know how difficult it is to describe Amplifer solutions on such a high level we are used to, in their sound differences....... and we all know he Mu-follower, we use, has more k2 and F4 and BA-3 more k3........so my description is very understandable!

in the evening the second channel is made...... second BAF night planned!

have fun build an AMP!

@variac: my BA-3 boards are ordered............
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Last edited by generg; 14th September 2011 at 11:58 AM.
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Old 14th September 2011, 11:58 AM   #53
Vix is offline Vix  Yugoslavia
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I think BA-3 front end will work fine even for these "poor man followers" , (like SEWA amp), making a nice synergy where the total quality exceeds the sum of its parts

Oh, and not to forget: Thanks Nelson!
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Old 14th September 2011, 12:21 PM   #54
Tea-Bag is offline Tea-Bag  United States
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@generg - you still running a rock in the front end of the F4?

I am also interested in what Mr. Rothacher is scheming with this front end.
I have an idea, but only a guess.
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Old 14th September 2011, 12:57 PM   #55
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Quote:
Originally Posted by Tea-Bag View Post
I am also interested in what Mr. Rothacher is scheming with this front end.
I have an idea, but only a guess.
Well, I thought I should build myself one of these fabled "Burning Amps".

Actually, I'm a robo-consumer pod person. It said Pass on the label and I automatically clicked "BUY".

Last edited by Michael Rothacher; 14th September 2011 at 01:07 PM.
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Old 14th September 2011, 01:52 PM   #56
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Many thanks to Nelson and everyone else who have helped bring this project to us proletariat. Very exciting (my wife just agreed—irony or enlightenment?) Just read the article and there’s more in there I understand than when I read the BA-2 details 18 months ago. However, a couple of things. Nelson mentions C3 and suggests using polyprop, electrolytic or both; so 5uF of polyprop and 5uF of electrolytic (got to be Silmic II ) would be OK? Would save on size and cost perhaps.
The other thing is these Toshiba JFETs. Can anyone say if there is a difference between 2SJ74 and 2SJ74BL and also 2SK170 BL/GR/V. I’ve checked the spec sheet but it doesn’t mention these.
Chris
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Old 14th September 2011, 02:07 PM   #57
Zen Mod is offline Zen Mod  Serbia
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Pa wrote about Ids in article

that means BL grade ( even if you can find some of V grade sissy enough )

usually GR-BL-V ( for some Y-GR-BL)

for Japanese Jfets - ranges of Ids

for BJTs - similar suffixes and some other are for Beta ranging
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Last edited by Zen Mod; 14th September 2011 at 02:12 PM.
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Old 14th September 2011, 03:20 PM   #58
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Thanks Zen. What is BL and why is V grade sissy?
You are talking to an ignoramus.
Chris
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Old 14th September 2011, 03:26 PM   #59
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They are graded by Idss like this:

GR: 2.6~6.5 mA, BL: 6.0~12 mA, V: 10~20 mA
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Old 14th September 2011, 03:29 PM   #60
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Thanks Michael,
So would the GR be better matched than BL or is it OK as long as we keep them in the same range?
Chris
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