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Old 22nd June 2013, 07:07 PM   #11
tinitus is offline tinitus  Europe
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please, lets not confuse the poor man more than 'need be'
for a standard F5 only the input jfets 'needs' to be well matched
but wont hurt to use matched outputs as well

if any channel 'imbalance', most likely it will be much more affected by any other source in your setup


that said, Im buying a few off NicMac's sets ...could be last chance to get any good ones
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Old 22nd June 2013, 07:16 PM   #12
NicMac is offline NicMac  Italy
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That's interesting!
9 out of 10 people I see here that use matched devises, use Idss matched K170/J74 even if Papa clearly says that they have to be Yfs matched.
Only EUVL seems to care that they are matched for both.
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Old 22nd June 2013, 07:19 PM   #13
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by NicMac View Post
Only EUVL seems to care that they are matched for both.
balanced amps

actually, I think Nelson said the output N to P matching would be more or less pointless since everything changes once mounted in amp
though I may remember wrong
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Old 22nd June 2013, 07:27 PM   #14
NicMac is offline NicMac  Italy
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Nope. I don't think so. Actually the opposite, if my memory does not fail.
I think EUVL recently showed in this forum the consequences of a MOSFET N-P Vgs offset in a F5 versus F5X. Much worse in the F5.......
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Old 22nd June 2013, 07:33 PM   #15
NicMac is offline NicMac  Italy
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here is the link
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Old 22nd June 2013, 07:34 PM   #16
tinitus is offline tinitus  Europe
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btw, some time ago i asked Spencer if he could match some J74 to the matched K170 quads I got from him at some time before that

very accurate specs were written on them

his reply...he said he could, but that it would most likely change a bit since they would be matched at different time of the year, and at different 'conditions'

so...not simple at all....but I got them anyway
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Old 22nd June 2013, 07:40 PM   #17
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by tinitus View Post
so...not simple at all....but I got them anyway
Not simple at all. But if you know the pitfalls also not that difficult

BTW Idss matched I presume
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Old 22nd June 2013, 07:42 PM   #18
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by NicMac View Post
Nope. I don't think so. Actually the opposite, if my memory does not fail.
I think EUVL recently showed in this forum the consequences of a MOSFET N-P Vgs offset in a F5 versus F5X. Much worse in the F5.......
not everyone have their own professional lab to verify the quality of their F5 amps

if you really want to go that far as you suggest, I think you will need a professionnal lab/workshop to verfy that every amp actually works that well

and to really get there, my guess is you will have to build many amps(modules), and match them all in function
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Old 22nd June 2013, 07:44 PM   #19
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by NicMac View Post

BTW Idss matched I presume
dont know, I only have the idss specs
but I trust Spencer
Im happy if they work, and keep working
my crazy 'audiophile' days are over
its just a crazy hobby now
and probably until ...
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Old 22nd June 2013, 07:50 PM   #20
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by tinitus View Post
Im happy if they work, and keep working
Does it not bother you at all that the amp might have sounded better with correctly matched devices?
If not, why buy matched devices at all
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