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DIY phone stage recommendation for..

Posted by rigma (A) on April 24, 2007 at 14:24:07

I would appreciate input on choosing a great DIY phono stage to use with the following. Music is mostly Jazz & Blues. Up to $2,500 in component parts is OK.

My preamp is a Berman 76 from Sound Practice issue 13. Currently I am using a battery biased 6LS7 RCA phono stage with Lundahl LL9206 step up trannies for the Denon 103. I would like to upgrade the phono stage if possible. DIY only.

Other equipment is Angela 91 300B mono blocks with beefed up power supply (additional 100uf + 10 hy choke). Speakers are Klipsch Jubilee clones. TT is VPI Aries II.

What about Allen Wrights FVP5? Other suggestions?

Additional equipment specs: The following is based on my limited knowledge and may not be accurate.

Input impedance of Berman 76 ~270K

Output impedance of Berman 76 ~320 ohms

Input impedance of the current phono stage ~47K

Input impedance of Angela 91 ~221K

Some measurements I took they may be helpful:

Voltage measurements were all with HP Digital Multimeter. These test were done with an Alps 250K volume control in the 76 which has been replaced with a 100K Daven stepped attenuator, 19 step 2db/step with a series 150K resistor for phono to maintain the 220K min. required by the RCA phone stage.

1Khz test tone @ .421 vac into 76 Pre amp from a test pink noise CD WE-91 starts to clip @ 7.75 vac at it's output into an 8 ohm resistor, per my scope, with an output from the 76 @ .603 vac into the input of the WE-91, which is right at 50% on the 76 volume control.

At 75% on the volume of the 76 it is putting out 2.22 vac and at 100% on the 76 volume it puts out 2.79 vac. No clipping was observed on the 76 output at full volume.

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