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el156 15th October 2010 04:10 PM

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

kevinkr 15th October 2010 04:38 PM

Quote:

Originally Posted by el156 (Post 2333599)
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.

Rod Coleman 15th October 2010 04:45 PM

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!

DF96 15th October 2010 06:00 PM

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?

Frank Berry 15th October 2010 06:15 PM

Quote:

Originally Posted by DF96 (Post 2333710)
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.

el156 15th October 2010 06:23 PM

Quote:

Originally Posted by DF96 (Post 2333710)
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?:D

el156 15th October 2010 06:33 PM

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?:D

Yvesm 15th October 2010 06:34 PM

Cross thread reflexion:
You CAN build a decent RIAA preamp with E/PCC189, but not with 12AU7 !

DF96 15th October 2010 07:09 PM

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.

sajti 15th October 2010 07:24 PM

Jadis used them in MC preamplifier.

Sajti


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