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Old 17th March 2009, 03:21 PM   #1
Cobra2 is offline Cobra2  Norway
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Default 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
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Old 17th March 2009, 03:27 PM   #2
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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.
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Old 17th March 2009, 03:37 PM   #3
Cobra2 is offline Cobra2  Norway
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Thanks!
Any guess how low I can go on R21?
+6-8dB would do the difference, I guess.

Arne K
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Old 17th March 2009, 03:47 PM   #4
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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.
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