pcc189 for audio use

el156 · 15th October 2010, 04:10 PM

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

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

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

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?

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?

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

15th October 2010, 04:10 PM	#1
el156 diyAudio Member Join Date: Apr 2010 Location: ALBUFEIRA ;PORTUGAL	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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15th October 2010, 04:45 PM	#3
Rod Coleman работник diyAudio Member Join Date: Jul 2004 Location: Warwickshire UK	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!

15th October 2010, 06:00 PM	#4
DF96 diyAudio Member Join Date: May 2007	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?

15th October 2010, 06:33 PM	#7
el156 diyAudio Member Join Date: Apr 2010 Location: ALBUFEIRA ;PORTUGAL	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?

15th October 2010, 06:34 PM	#8
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	Cross thread reflexion: You CAN build a decent RIAA preamp with E/PCC189, but not with 12AU7 !

15th October 2010, 07:09 PM	#9
DF96 diyAudio Member Join Date: May 2007	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.

15th October 2010, 07:24 PM	#10
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	Jadis used them in MC preamplifier. Sajti

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