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Old 15th October 2010, 05:10 PM   #1
el156 is offline el156  Portugal
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Default pcc189 for audio use

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
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Old 15th October 2010, 05:38 PM   #2
kevinkr is offline kevinkr  United States
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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
They aren't very linear because of their variable mu and hence aren't recommended. They might be interesting in a guitar effects box, but otherwise I would stay away.
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Old 15th October 2010, 05:45 PM   #3
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I have used PCC189 in a RIAA second stage (JFET shunt cascode 1st stage).

They are not very linear (as Kevin has said) for large signals -

BUT, if you run them in cascode (shunt cascode for preference) and 90V/15mA, they sound very fine for low-level signals. Low cost way to make a preamp full of Mullard valves, anyway!
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Old 15th October 2010, 07:00 PM   #4
DF96 is offline DF96  England
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I'm puzzled by the modern approach to audio: pick a valve (sometimes at random), then ask/decide what could possibly be done with it.

Maybe I should join in. A few months ago I bought a cheap batch of valves off ebay. Among them were some photocells. Could I use them to build a phono preamp?
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Old 15th October 2010, 07:15 PM   #5
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Quote:
Originally Posted by DF96 View Post
I'm puzzled by the modern approach to audio: pick a valve (sometimes at random), then ask/decide what could possibly be done with it.

Maybe I should join in. A few months ago I bought a cheap batch of valves off ebay. Among them were some photocells. Could I use them to build a phono preamp?
Phono Preamp?
Did the batch of tubes include any 6V6's? (just joking).
Like you, I'm puzzled.
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Old 15th October 2010, 07:23 PM   #6
el156 is offline el156  Portugal
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Quote:
Originally Posted by DF96 View Post
I'm puzzled by the modern approach to audio: pick a valve (sometimes at random), then ask/decide what could possibly be done with it.

Maybe I should join in. A few months ago I bought a cheap batch of valves off ebay. Among them were some photocells. Could I use them to build a phono preamp?
Why not? could use a photocell to adjust the RIAA correction depending of the amount of light you have in the room?
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Old 15th October 2010, 07:33 PM   #7
el156 is offline el156  Portugal
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Thanks a lot!
Because i dont work with RF ,i have to find another use for the PCC189 i have! Maybe REBRAND them as ECC88, and make a nice Phono preamp?
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Old 15th October 2010, 07:34 PM   #8
Yvesm is offline Yvesm  France
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Cross thread reflexion:
You CAN build a decent RIAA preamp with E/PCC189, but not with 12AU7 !
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Old 15th October 2010, 08:09 PM   #9
DF96 is offline DF96  England
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You could use 189s for every stage in the phono preamp, and explain to people that they add musicality and compensate for signal compression in the cartridge. Soon, everyone will want one!

To be serious, yes, you could use one for the first stage. They are a lot cheaper than 88s, and a small unbypassed cathode resistor (27R?) can help linearise them.
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Old 15th October 2010, 08:24 PM   #10
sajti is offline sajti  Hungary
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Jadis used them in MC preamplifier.

Sajti
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