CARY SLP05 - tube configuration?

Hi- is this NOS rectifier a decent upgrade over the stock? Approx market value if condition is good?

Mullard (for Zenith) GZ34 5AR4 1969 UK


My SLP-05 had a problem with the left channel, but it was intermittent. Gave up for several months and put my back-up in. Came across the upgrade, which replaces 10 caps and 20 resistors and figured they’d find the problem. Sure enough, there was a resistor which had smoked. My SA-200.2 was also improved with the current inputs. Mine was an original model with noisy parts. So far so good! Can’t directly compare the sound since it was nearly a year since I heard it.

Appreciate any advice on the rectifier.

I’m running balanced to balanced, so I’ll need six 6SN7. Should the tubes be purchased in matched pairs for the Left/Right?

I’m not interested in frequent tube rolling, so I’m hoping there’s a high quality NOS or new production option which delivers all around better resolution and darker background than the EH. So, not a tube known to impart a heavy handed, tailored sound onto any given recording.

Appreciated any advice!