ONO; more MM gain, please!

Cobra2 · 17th March 2009, 03:21 PM

I have a diy-(X)ONO, and would really like some more gain for MM.
(stock=40dB).
For MC, there are 2 jumpers, but MM is fixed...
Any hints how to increase MM gain wil be most welcome!

Arne K

analog_sa · 17th March 2009, 03:27 PM

Reducing the 100ohm resistor R21 will help within limits. A lot of people have simulated the design so OLG must be well known. This will give you a hint of the max CLG before riaa gets affected. I am sure you can easily squeeze in an extra 10db.

Cobra2 · 17th March 2009, 03:37 PM

Thanks!
Any guess how low I can go on R21?
+6-8dB would do the difference, I guess.

Arne K

analog_sa · 17th March 2009, 03:47 PM

The best answer would come from someone with a working simulation - a PM to Stefanoo may help. At +6db you should probably also raise the 220uF caps proportinately to the reduction in resistance if you are using them.

17th March 2009, 03:21 PM	#1
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	ONO; more MM gain, please! I have a diy-(X)ONO, and would really like some more gain for MM. (stock=40dB). For MC, there are 2 jumpers, but MM is fixed... Any hints how to increase MM gain wil be most welcome! Arne K __________________ Ars longa, vita brevis

17th March 2009, 03:37 PM	#3
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Thanks! Any guess how low I can go on R21? +6-8dB would do the difference, I guess. Arne K __________________ Ars longa, vita brevis

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17th March 2009, 03:27 PM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Reducing the 100ohm resistor R21 will help within limits. A lot of people have simulated the design so OLG must be well known. This will give you a hint of the max CLG before riaa gets affected. I am sure you can easily squeeze in an extra 10db.

17th March 2009, 03:47 PM	#4
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	The best answer would come from someone with a working simulation - a PM to Stefanoo may help. At +6db you should probably also raise the 220uF caps proportinately to the reduction in resistance if you are using them.