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Old 16th April 2012, 08:45 PM   #21
daanve is offline daanve  Netherlands
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Originally Posted by ichiban View Post
Please see posts 13 & 15
Does this work ? .. Updated the spreadsheet ... but not so easy for some reason.
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Old 16th April 2012, 09:39 PM   #22
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Is there measurements showing an significant improvement over the 3497/618 combo? Has anyone had a chance to listen and can comment on the difference in the sound? I am assuming that maybe EUVL is the only person fortunate enough to have done so.
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Old 17th April 2012, 03:36 AM   #23
EUVL is offline EUVL  Europe
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No. I am also waiting like all of you.

Smyslow is the only person who has both amps (K1530/J201 & K3497/618) within the test team.
But he is too busy right now to have a chance for proper listening.

I expect the two sets of output devices to sound different.
Measurement does not tell you everything.


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Old 17th April 2012, 12:26 PM   #24
flg is offline flg  United States
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Post #13? I copied the latest list and added my name, #15. 3 hours later I dissappeared (post #16)??? So, I copied the latest list and put myself back.
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Old 17th April 2012, 12:28 PM   #25
AndrewT is offline AndrewT  Scotland
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Some folk cannot type.
Some folk refuse to check their posts.
Some folk have little respect for others.
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Old 17th April 2012, 12:34 PM   #26
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Originally Posted by EUVL View Post
No. I am also waiting like all of you.

Smyslow is the only person who has both amps (K1530/J201 & K3497/618) within the test team.
But he is too busy right now to have a chance for proper listening.

I expect the two sets of output devices to sound different.
Measurement does not tell you everything.


Patrick
I would tend to agree, as every pair I have tried in the Ba output have sounded different, but some more than others. The laterals were the most different in terms of sound, others more nuanced. If comparing to set of fets that make for a pretty good complimentary pair like 3497/618 vs 1530/201, how differerent will they be. Guess i should plug the 3497/618 into the BA and listen for differences. Guess timw will tell.

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Old 17th April 2012, 04:31 PM   #27
pchw is offline pchw  United States
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34897/618 are not true complementary. 1530/201 are.
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Old 17th April 2012, 04:40 PM   #28
pchw is offline pchw  United States
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The cut & paste sometimes have this kind of issue that both users can start with the same list; hence, the last save overwrites the first post. Use the Google doc (in post #1) which has a little concurrency control and reflects any other's changes while you are editing.
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Old 17th April 2012, 04:43 PM   #29
EUVL is offline EUVL  Europe
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> 3497/618 are not true complementary. 1530/201 are.

That is correct.
But then 214/77 or 2013/313 are also not true complementary.

3497/618 has high transconductance but also high capacitance.
It is like the discussion a few years back of IRFP044 vs IRFP240 in Aleph X.
The former sounds darker.

I expect 3497/618 to be similar.


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Old 17th April 2012, 05:30 PM   #30
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Euvl,
What causes just a drastic difference in repsonse from two fets that appear very close on paper. Is it the difference in the Capacitance at various levels causing similar Yfs to yeld different current responses at similar Vgs.
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