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Old 15th October 2010, 08:33 PM   #11
el156 is offline el156  Portugal
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Quote:
Originally Posted by sajti View Post
Jadis used them in MC preamplifier.

Sajti
HI !
Do you have this JADIS schematic? Could be interesting to see it !
Thanks !
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Old 15th October 2010, 08:38 PM   #12
Yvesm is offline Yvesm  France
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Draw an horizontal load line near 15mA (CCS) and look how linear it can be
Mu is just above 30
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Old 15th October 2010, 11:40 PM   #13
piano3 is offline piano3  United Kingdom
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Or you could design a valve compressor-still very popular in recording studios!
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Old 16th October 2010, 02:06 AM   #14
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Quote:
Originally Posted by el156 View Post
Hi All !
Does someone has used PCC189 for audio? These are variable mu twin triodes but i dont know if they usable for audio !
Thanks !
Silvino
I have used them and I did not choose them at random. This is my story.
Several years ago I came across a article on the WWW. The question was posed “Is the 6dJ8 suitable for audio? Turns out someone had mislabeled Tunsgram variable mu valves as 6DJ8’s. The article was rather long winded. The short version is if the tube was biased toward the high end of the anode current scale it behaved as you would expect for a 6DJ8. At the 2, 3 & 4 ma anode currents it was very nonlinear.
The PCC189 is the 7 volt version of the imposter valve. I found a couple of dozen Tunsgram PCC189’s for near $1 each. A pair of them went into a common cathode line amplifier that made an Alesis RA 150 sound very Class A SET like. Another pair was biased up hot, I could not tell them from 6DJ8’s in that application. The fun was worth the few dollars.
DT
All just for fun!
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