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Audio Research CD7's 6H30 tube rolling

The CD7 uses 6H30 tubes - 3 for power supply and 4 for the output stage.

Presently there are only new 6H30 tubes from Sovtek and Electro-Harmonix and NOS 6H30-DR tubes from the Russian military from around 20 years ago.

Some people have commented that the NOS tubes are sweeter sounding and have more "air" extension with their CJ or ARCref3 preamp equipment and others have commented that the latest new tubes (around 2005+?) sound so good that there isn't any difference anymore in sound.

Has anyone done tube rolling for this CD machine with the NOS tubes? And with what results? Would it be better to change the 3 power tubes or the 4 output tubes? Or all 7 tubes perhaps?

Thanks in advance for any comments!
flkin

Showing 1 response by mrtennis

mrtennis
3,295 posts
 
hi elberoth2:

i would be very interested to hear what players you owned before buying the arc.

i am considering a cd player and my short list includes the amr 77 and the marantz 7s1. i have heard the audio research player several times, but not in my own system.

i found the cd7 too focused for my taste, which is consistent with my impression of their preamps and amps, as well.
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