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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Who made the preamp? posted by Russ57 on March 11, 2007 at 04:37:31:
Thank you for your interest.
It is VAC CPA-1 heavily modified.
I found the problem that caused the imbalance.
It was due to shortage between 2K resistor (the most input-ward) and input wire in DACT 10K attenuator in the left channel. As a result the left DACT attenuator acted as 8K attenuator. [Increase in voltage by a step is proportional to (step resistor value/8) for the left channel instead of (step resistor value/10) for the right channel. So 20% increase in the left channel.] In reality, it is not the reduced output from the right channel but the increased output from the left channel that caused the imbalance.
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Follow Ups
- Re: Who made the preamp? it was due to.... - yhm23280@gmail.com 06:21:26 03/11/07 (0)
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