2N2222A phono preamp - Page 13

RNMarsh · 26th January 2013, 06:58 AM

Quote:

Originally Posted by gianxdiy

I totally agree sonidos. I've learned a lot from Ivey and i love riaa circuits, i built dozens of riaa phono stage with tubes, bjts, fets, etc.
Thanks Ivey, wherever you are now, great man, and technician!!!
Maybe Ivey Riaa is not the best but i think that certain "finesses" in his topology had to be developed.
In memory of Ivey i studied his circuit in my multisim, started to test in real life and i would like to share my implementations and optimized components values. For an "old" riaa, calculated by hand, it's a great result!
If you want i will show my "tribute" to Ivey with my schematic and graphs from simulator, than a simple pcb with or without his series regulated supply, so similar to that i used for years with excellent low-noise satisfaction in musicality.
Are you curious?

Sonically yours,
Gianni

Count me in.

gianxdiy · 26th January 2013, 09:52 AM

Just do it, RNMarsh!

2N2222A phono preamp

gianxdiy · 4th February 2013, 08:10 AM

Any feedback is WELCOME!

carolus · 17th February 2013, 04:04 PM

Quote:

Originally Posted by Salas

Cascaded diff amps with passiive Riaa and a bootstrap.

I build this one, in a spider web & point to point & match BC109 ... & accu PSU.
It's magic (even with a card MM Grado-gold) ... It's music ... I love it.

Salas · 17th February 2013, 04:53 PM

Rather best for MM as you used it considering its expected input noise figure.

gianxdiy · 26th February 2013, 04:30 PM

Thanks Salas, i really appreciate, especially from you!

gianxdiy · 26th February 2013, 04:40 PM

Quote:

Originally Posted by carolus

I build this one, in a spider web & point to point & match BC109 ... & accu PSU.
It's magic (even with a card MM Grado-gold) ... It's music ... I love it.

I know well that phono pre. I don't like it for many reasons:
No real need for a differential stage without global feedback, according to me.
Hi value resistors both for the bjts and passive riaa, so bye bye to the bc109 noise figure.
The bootstrap is not worse than moderate global feedback that gives more control to the full circuit and less device-dependent. I prefer local feedback but we are talking of a cheap and realiable phono stage here.
Regards,
Gianni

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26th January 2013, 09:52 AM	#122
gianxdiy diyAudio Member Join Date: Jan 2009 Location: Pescara	Just do it, RNMarsh! 2N2222A phono preamp

4th February 2013, 08:10 AM	#123
gianxdiy diyAudio Member Join Date: Jan 2009 Location: Pescara	Any feedback is WELCOME!

17th February 2013, 04:53 PM	#125
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Rather best for MM as you used it considering its expected input noise figure.

26th February 2013, 04:30 PM	#126
gianxdiy diyAudio Member Join Date: Jan 2009 Location: Pescara	Thanks Salas, i really appreciate, especially from you!