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Old 31st August 2012, 11:51 AM   #21
Salas is offline Salas  Greece
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Sam that will be Sonny's to answer, I had only used a pair of 2SK1058s & 2SJ162s on easy speakers in a early experimental 175mA bias 50W SSA amp.
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Old 31st August 2012, 11:54 AM   #22
Salas is offline Salas  Greece
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Quote:
Originally Posted by sonnya View Post
I have tested it with single 16amp. This will lower the output impedance of about 40% but the gfs is also 4S instead of 2S... This means a doubling of the openloop gain.
We cross posted, sorry. Higher Ciss makes it ''slower'' in that case? And any changes in comp caps necessary? Sounds like an option.
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Old 31st August 2012, 11:54 AM   #23
mikelm is offline mikelm  England
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Quote:
Originally Posted by sonnya View Post
I have tested it with single 16amp. This will lower the output impedance of about 40% but the gfs is also 4S instead of 2S... This means a doubling of the open loop gain.
and how it sound with these ?

p.s. also could explain this "but the gfs is also 4S instead of 2S"

thx

Last edited by mikelm; 31st August 2012 at 11:58 AM.
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Old 31st August 2012, 11:58 AM   #24
sonnya is offline sonnya  Denmark
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It will give you more control in the bass section in my opinion, but they are also twice as expensive as ECX10N20 and ECX10P20.

upwards i do not see a lot of differences...

But my amp is also running with Z foil resistors all over the place.. 13€/resistors

Well i have only conducted the test myself and my wife have listened too...
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Old 31st August 2012, 12:00 PM   #25
mikelm is offline mikelm  England
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you think Z foil is significantly better than Caddock TF020 ?

did get around to try them yet
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Old 31st August 2012, 12:09 PM   #26
sonnya is offline sonnya  Denmark
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The noise floor is lower, and TC is 0.2ppm... Does not get better... But i have not tried the TF020.

4Siemens is the transconductance.

2S is 2A at 1V and 4S is 4A at 1V VGS change. -> more gain.
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Old 31st August 2012, 12:13 PM   #27
Salas is offline Salas  Greece
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Still nicely stable and drivable with no alterations as I understand? Zfoils for the feedback resistors only or VSMPs SMT all over there?
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Old 31st August 2012, 12:23 PM   #28
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Salas View Post
We cross posted, sorry. Higher Ciss makes it ''slower'' in that case? And any changes in comp caps necessary? Sounds like an option.
Yes but in this case i have a driver. So i do not see an increase in distortion in the audible range as frequence increase.
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Old 31st August 2012, 12:35 PM   #29
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However, I suspect a slight deterioration in midrange and treble nuances both with (i) doubling output devices or (ii) using single double-die devices.

I am not sure about the Exicon parts but with the original Hitachi parts (K1058/J162), the Gate resistors being changed from the usual 100E/200E to 470E and 680E makes a remarkable difference to the balance of the sound. I am not able to recollect which value for which polarity device.
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Old 31st August 2012, 12:46 PM   #30
sonnya is offline sonnya  Denmark
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Here there is no gate resistors in the same way as with many designs.

But the is at least 220R in the signal path gate to source and the driver transistor has a re of ~5R + it looks into current generator which is high impedance...

Anyway the is no oscillation visible....
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