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Old 26th January 2013, 06:58 AM   #121
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by gianxdiy View Post
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
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Old 26th January 2013, 09:52 AM   #122
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Just do it, RNMarsh!
2N2222A phono preamp
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Old 4th February 2013, 08:10 AM   #123
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Any feedback is WELCOME!
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Old 17th February 2013, 04:04 PM   #124
carolus is offline carolus  Belgium
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Quote:
Originally Posted by Salas View Post
Cascaded diff amps with passiive Riaa and a bootstrap.
Click the image to open in full size.
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.
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Old 17th February 2013, 04:53 PM   #125
Salas is offline Salas  Greece
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Rather best for MM as you used it considering its expected input noise figure.
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Old 26th February 2013, 04:30 PM   #126
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Thanks Salas, i really appreciate, especially from you!
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Old 26th February 2013, 04:40 PM   #127
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Quote:
Originally Posted by carolus View Post
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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Old 5th December 2013, 01:36 PM   #128
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Quote:
Originally Posted by Conrad Hoffman View Post
Here's the old Ace circuit:
Click the image to open in full size.

I changed my output cap to 10uF/50V, the 6.8K to 12K and the 12K to 10K, probably for the zero distortion mod. Their addendum listed a couple of other changes as well.

CH
Conrad, I used your circuit, and replace the recommended transistors with the following units PN3638A and PN3565. Then I reduced the voltage to 25 volts.
And it sounded really good with no ringing.
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Old 19th March 2014, 08:35 AM   #129
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hi Ivey.
the design of the post 23 and 24 has been tried and does it work?
I'd like to build your pre but I have a question regarding the in and out electrolytic capacitor: can replace with a MKP 0,1uf/1uf?
thanks in advance for your help and sorry for my terrible english.
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Old 18th June 2014, 11:07 PM   #130
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Quote:
Originally Posted by robertor View Post
hi Ivey.
the design of the post 23 and 24 has been tried and does it work?
There are some pretty substantial errors in most of the schematics he posted. For example, one of the 2N2222A phono preamps has a 1uF cap from input to ground, or there's the 12AU7 cathode follower that biases the grid positive WRT by design.

Your best bet is to try Gianni's version of the circuit.
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