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Old 13th June 2006, 08:11 AM   #2971
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Just as a simple test i'm running one channel with 2SK170 for input and output and the other channel with 2SK170 on input and a BC879 darlington (BC517 equiv) on the output.

I'll report any noticable differences later.

Brent
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Old 13th June 2006, 09:00 AM   #2972
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It didn't take to long to decide what I prefered.

The darlington output had slightly more bass but only just.
The FET gave more air to Kralls 'the girl in the other room'.

So for me I will be sticking with a FET output.

Now to test my Black Gate caps on the output

Brent
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Old 13th June 2006, 09:11 AM   #2973
awpagan is offline awpagan  Australia
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Quote:
Originally posted by rowemeister
It didn't take to long to decide what I prefered.

The darlington output had slightly more bass but only just.
The FET gave more air to Kralls 'the girl in the other room'.

So for me I will be sticking with a FET output.

Now to test my Black Gate caps on the output

Brent

with only one component changed on one channel.
the highs are not matched well between channels

stereo effect is more perceptable on highs

allan
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Old 13th June 2006, 09:19 AM   #2974
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Quote:
Originally posted by awpagan



with only one component changed on one channel.
the highs are not matched well between channels

stereo effect is more perceptable on highs

allan
I had already tried the stereo test on friday. This was just another small test to compare.
I got a mate to adjust balance for this test (also the speakers were next to each other)
Both tests gave me the same answer.

Brent
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Old 13th June 2006, 10:04 AM   #2975
awpagan is offline awpagan  Australia
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Quote:
Originally posted by rowemeister


I had already tried the stereo test on friday. This was just another small test to compare.
I got a mate to adjust balance for this test (also the speakers were next to each other)
Both tests gave me the same answer.

Brent
Brent
you tried a pair with all fets and a pair with fets in tranny out
if yes
sorry i got the wrong end of the stick.

Now all we need is to lower the fet out impedance to see if that brings up the bass
2sk170 2sj74 push-pull?

allan
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Old 13th June 2006, 10:18 AM   #2976
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Quote:
Originally posted by awpagan


Brent
you tried a pair with all fets and a pair with fets in tranny out
if yes
sorry i got the wrong end of the stick.

Now all we need is to lower the fet out impedance to see if that brings up the bass
2sk170 2sj74 push-pull?

allan
Yes I tried all the combo's

A little more bass would be nice

Brent
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Old 13th June 2006, 10:42 AM   #2977
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by rowemeister
A little more bass would be nice
You need to DIY a really good subwoofer or two!
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Old 13th June 2006, 11:02 AM   #2978
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Quote:
Originally posted by SimontY


You need to DIY a really good subwoofer or two!

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Old 13th June 2006, 11:08 AM   #2979
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After some google searching I found various DIY project where the 2SK170 is used in parallel to give better noise and input capacitance (equiv to the 2SK147), this has been done mainly on MC and MM applications.

I gave it a whirl and could not tell any difference . LOL. Don't know much about the MM and MC circuits but looking at them the capacitance would affect them.

Brent
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Old 13th June 2006, 11:28 AM   #2980
awpagan is offline awpagan  Australia
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Quote:
Originally posted by rowemeister
After some google searching I found various DIY project where the 2SK170 is used in parallel to give better noise and input capacitance (equiv to the 2SK147), this has been done mainly on MC and MM applications.

I gave it a whirl and could not tell any difference . LOL. Don't know much about the MM and MC circuits but looking at them the capacitance is a big factor.

Brent

I've been looking around for mm stuff and //2sk's
but //fets lowers input impedance, a fet is allready lower than tranny
what's why the darlington tranny

I was looking for lower output impedance

allan
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