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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: Line amp/AVC/TVC thoughts posted by pix on February 23, 2017 at 23:18:09:
Info. loss due to impedance mismatches has plagued 'philes for a very long time.
The long established 1:10 rule is a good guide. Your phono preamp needs to work, at a minimum, into 20 Kohms. The 100 Kohm attenuator was/is fine. However, that 100 Kohm attenuator needs to work into (sic) 1 Mohm and the cabling between the attenuator and the power amp must be extremely low capacitance. Substantial cable capacitance here will result in HF info. loss. :>( That 400 pF. mentioned could be an issue too.
You found a SS buffer to be, at least, tolerable. Try a tubed buffer. A single ECC99 set up as 2X cathode followers should do the job. As long as the signal source is DC offset free, a bipolar PSU will allow you to hold the cap. count inserted into the signal path by the buffer down to 1. :>) 10M45S CCS loading of the CFs is another refinement to consider.
Eli D.
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