Super fast, low noise phono preamp

[analog_sa]

Hi Dioklecijan


Your web site has fascinating subjective descriptions of the effects of SRPP and generally opamps, which i am fully in agreement with. Unfortunately i couldn't find anything about your implementation of the SRPP stage. Does it replace the output opamp?

regards

 

[dioklecijan]

Yes!

Administrator of this site is Bojan Hajdinjak, audio constructor, he write about SRPP.

 

[Jan Dupont]

Just of curioucity

I see that you are using a wooden frame....
How does it perform without all metal chassis shielding ??

 

[dioklecijan]

Fantastic!

This is really quiet preamp. No hum, no noise, nothing. In MC position, at full volume, you must place ear about 20 cm behind speakers to hear anything.

 

[hagtech]

This looks suspiciously similar to my Bugle phono stage, or perhaps great minds think alike?

Bugle Phono

One problem is R12. It's value should be a little higher because it is in parallel with R14, at least in terms of the proper time constant. That's why I used 8.45k.

jh

 

[dioklecijan]

Thanks Hagerman for your suggestions.
Yes, my phono is very similar with your Bugle. With opamps all good phono preamps will be similar.

 

[Upupa Epops]

To hagtech : Opamps of OPA 13... family are not so good as phono preamps, 'cos they have relatively high noise - try on first position OPA 627. Also + / - 9V is not enough for good overload.

 

[Upupa Epops]

To dioklecijan : Try to change time constant : tau 1 + 2 beside first stage, tau 3 beside second - you get better SNR.

 

[dioklecijan]

Yes I do.

As you see.

 

[PTSOUNDLAB]

Hello,

sorry but this link is dead http://www.hiendfi.com/modules.php?...article&sid=102

Pascal.

 

[dioklecijan]

New link

http://www.hiendfi.com/modules.php?name=Sections&op=viewarticle&artid=120