Phono Stage Amp

The root problem is WHY crank the volume up just past half way and there tends to be distortion.

If the M1 can’t provide enough voltage to feed the downstream components, then the preamp volume control should be able to turn all the way to max to add gain. It may increase noise level but not distortion.

In theory that’s fine, but especially with TT gear involved, my experience is that if you don’t keep the signal in a "sweet spot" range at EVERY stage, bad things happen - and at best, suboptimal sound is the result. OP needs to fix the phono stage mismatch either way.

If OP gets a better phono stage and the distortion still remains at higher listening levels, then other potential culprits like feedback (solutions: better isolation, or simply moving the table, maybe a subsonic rumble filter...) should be examined in further detail. One problem at a time...

@cinqcepages,

FWIW: The cat Eye tube upfront as output level indicator. If that cat’s eye ever blinks shut while you’re playing your tunes, you’ve reached full power from the Cary 805 amp.

Below is from Stereophile measurements:

Cary 805 amp voltage gain averaged 23.2dB at 5dB feedback (into an 8 ohm load, slightly less into a 4 ohm load, slightly more into a 16 ohm load). With 0dB of feedback, the gain increased to 25.2dB; with 10dB of feedback it dropped to 18.2dB (all into an 8 ohm load).

Mike

@mulveling My older M1:

MC input Frequency response RIAA/IEC ±0.2dB Input sensitivity 300µV in for 300mV out (at 1 kHz) Input impedance 47KΩ THD at 1 kHz 88dB “A”-wtd. Line level outputs 1 pair RCA (phono) left and right 300mV rms nominal

No dip switches.

Are you suggesting Bob's Sky 30 SUT? I looked it up and am reviewing it. It seems very reasonable and affordable. My MF is 10+ years old. 

There is an Audio-Technica Signet MK10T step up for sale now @ A'Gon.

Not certain if the 1/15 ratio is enough for your low output cartridge, but others here should know.

If so, it would be an inexpensive experiment.

DeKay