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Old 13th February 2007, 02:20 AM   #11
sandy is offline sandy  India
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Join Date: May 2004
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Default gain is the problem

I had made one such preamp...through a chinese source. The problem is the gain...it is too much for my setup.

Any ideas on how the gain can be lowered ? Changing the output buffer valve to 12AT7 or 12AU7 does not seem to help much either...

Regards
Sandy.
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Old 13th February 2007, 03:52 AM   #12
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Default Re: gain is the problem

Quote:
Originally posted by sandy
I had made one such preamp...through a chinese source. The problem is the gain...it is too much for my setup.
You'd have to add a resistor network to attenuate the input gain. Its way too high when used with cd source.
Sorry, I can't recall the actual values as it was implemented successfully for a friend who complained that 3 clicks of the step attenuator (built in volume control) was already too loud.
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Old 13th February 2007, 10:17 AM   #13
sandy is offline sandy  India
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Default exactly the same problem

Exactly the same issues....even first point of the attenuator is too loud !!
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Old 14th February 2007, 05:15 AM   #14
kmtang is offline kmtang  Canada
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My friends and I all built the Marantz M7 line amp as our reference for enjoying the music. We all using Tube Regulated Power Supply for B+ and stabilized 12Vdc for the filament supply.

The results are very remarkable and outstanding.

Besides, I also built another one using 12SL7 and 12J5 instead of the 12AX7 and 12AU7 for amplication and bugger. However, I need to tweak the bias for the 12SL7 to get good sound from it.


Johnny
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