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 tlg

I use a similar method with my CD3 MK2. I put 3 audio points under the player because my cabinet does not surpress vibrations very well. Wether or not it has made an improvement is hard to say but it gives me piece of mind.