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Remove riaa stage from cheap phono pre
Remove riaa stage from cheap phono pre
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Old 3rd September 2017, 10:21 PM   #21
scottjoplin is offline scottjoplin  Wales
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Yes, remember, increasing the resistance lowers the feedback which increases the gain
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Old 3rd September 2017, 10:29 PM   #22
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Thankyou Scott.
Do you think is better to start increasing r3, r4 or r6? or all three?
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Old 3rd September 2017, 10:34 PM   #23
scottjoplin is offline scottjoplin  Wales
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Don't touch r3 or r4. Remove the short from C5 and put your pot across it instead. What value pot do you have?
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Old 3rd September 2017, 10:43 PM   #24
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I've some spares resitors..10k, 12k, 47k. 82k, 360k
and pots.. 1ka, 50ka, 10kb, 25ka, 1MA, 100ka
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Old 3rd September 2017, 10:51 PM   #25
scottjoplin is offline scottjoplin  Wales
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I'd try the 50k first and if it doesn't give you enough gain the 100k
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Old 3rd September 2017, 10:51 PM   #26
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Thank you Scott. I'll try and then report
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Old 3rd September 2017, 10:54 PM   #27
scottjoplin is offline scottjoplin  Wales
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Good luck
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Old 3rd September 2017, 10:55 PM   #28
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Old 3rd September 2017, 11:32 PM   #29
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There's something strange..

remove both 3.3 nf, then when i remove on only one channel, the 12 nf and i short it (with or without resistor), this channel is perfect (no riaa, right gain).
When I remove the other channel 12nf, on the channel previously ok (no riaa), come back the equalization and more gain.

In the second channel, the are no differences between with or without the 12nf cap
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Old 4th September 2017, 08:05 PM   #30
scottjoplin is offline scottjoplin  Wales
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Have you checked you are doing exactly the same thing on the second channel as the first?
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