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Old 14th May 2003, 05:09 PM   #11
316a is offline 316a  England
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Default Depletion Mosfets

Hello ,
I'll be using a simple DN2540 first then a cascode with a 2540 TO220 and TO92 . Like the 'hot'n'low' opearting point for 12E1 !

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Old 14th May 2003, 10:35 PM   #12
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interesting to say-old geezers from old books use to say that triode like to see at least 3Ra even if load is cathode connected.
that's why CFs are most linear when they are CCS loaded.
I pay that price once-when I was brave enough to put 600:600 xformer in cathode
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Old 15th May 2003, 12:49 AM   #13
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Default CFs...getting fed up.

Hi,

Quote:
that's why CFs are most linear when they are CCS loaded.
There's a small raft of different CFs out there but either way it's hard to make a "Joe Average CF" more linear than it is already.

Oh well not all CSSs are made equal either...

A CCS will linearise virtually any circuit...whether you like the result or not is an other issue altogether...

Making generalisations like that is not going to help you nor anyone else...

Cheers,
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Old 15th May 2003, 02:06 PM   #14
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Quote:
Originally posted by pedroskova
Anthony Dockrill had an article in Valve discussing a 10Y driving a parafed CF 6L6GC in tetrode mode. No longer up on the web, but I could email you the pdf.
Got it. Thanks. Interesting that he refers to it as tetrode mode but it is really in triode mode because the cathode is moving up and down while the plate and screen are staying put, i.e. plate and screen are doing the same thing. For tetrode mode, the screen should move up and down with the cathode but at a fixed voltage above it, while the plate stays still. Only read that recently, didn't realise it mysef until then.
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Old 16th May 2003, 12:11 AM   #15
Zen Mod is offline Zen Mod  Serbia
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Default Re: CFs...getting fed up.

Quote:
Originally posted by fdegrove
Hi,



There's a small raft of different CFs out there but either way it's hard to make a "Joe Average CF" more linear than it is already.

Oh well not all CSSs are made equal either...

A CCS will linearise virtually any circuit...whether you like the result or not is an other issue altogether...

Making generalisations like that is not going to help you nor anyone else...

Cheers,
interesting-most apealing way to make any stage in tube amp or preamp (for me,off course) is to use single triode and xformer,hehe-in any order you want or can;
I know that is not best way in any case,but I just like sound made with lotsa iron


accent was on right Rload,not on CCS.I like CCS in heater circ,but I realy don't bother much with implementation of same in cathode or anode.
but,what is important-is good to know and try various ways in achieving to make good stage.
(that's why I asked for some schmtc )
for me seems that more important are some other things for good stage.like operating point,slew rate,etc etc are;
in fact ,I almost hate most of SRPP designs,even real CCS loaded-I can't say much more except that sound made in that way is sorta boring
be well!
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