Pearl X MC/MM phono preamplifier

[OnAudio]

Thanks Marcel, seems this is a well worn coat. Active input resistance seems like a great way to cheat the source for BJTs, wanted to do the same for above

 

[OnAudio]

An alternative opamp to the LT1115

 

[MarcelvdG]

They will be fighting each other when they have unequal offset voltages, using separate feedback networks can solve that.

 

[OnAudio]

Thanks Marcel, its quite interesting the number of tricks one can try out to achieve similar performance to Pearl3

 

[OnAudio]

A quality 10uf-220uf input capacitor fixes most problems allowing one to use many choices of opamps. With a couple of signal relays this input stage will work ok for MM and MC

 

[OnAudio]

There are a couple of solid reasons why the above OPA828 phono preamplifier is superior probably even superior to the schematic in first post with no feedback jfets. One could replace the pearl3 front end with this and see how they like it

 

[OnAudio]

Pearl3 is in stock, its a deal that's hard to beat

https://diyaudiostore.com/products/pearl-3-phono-preamplifier
https://modushop.biz/site/index.php?route=product/product&product_id=971
https://guides.diyaudio.com/Guide/Pearl+3/28

 

[Nick Sukhov]

Pearl3 is in stock, its a deal that's hard to beat

Cy-XXI KIT is also in stock, with better freq resp, lower noise and lower price
https://imrad-com-ua.translate.goog..._sl=ru&_x_tr_tl=en&_x_tr_hl=ru&_x_tr_pto=wapp

 

[OnAudio]

How we going in https://www.pcbway.com/project/shareproject/Groove_Phono_MM_MC_preamp_90fa1c54.html
Show interest here