How 'good' they are kinda depends on the equipment they go in. Overall, I found the more resolving is the gear the more likely the DRs improve it. Not so much in a CJPremier 140, more so in ARC. I have them in my Ref 10 Phono. Imo the differences between EB and DR are not huge, others have their experience. I have not heard them in a REX2. DR does have long lifespan.
Sorry for the belated comment, but 6H6 tube is not a good substitute for 6H30. You may like the result - I stopped making predictions long ago - but the circuit will not work as it should, as these have very different characteristics.
Good quality NOS 6H30 tubes can still be found on ebay. One just has to be careful.
Victor Khomenko
Balanced Audio Technology
Good quality NOS 6H30 tubes can still be found on ebay. One just has to be careful.
Victor Khomenko
Balanced Audio Technology
The 6H30 is extremely linear and the Audio Research REF40 has extremely low distortion for a tube preamplifier - I remember measuring it and was really impressed. Probably using other pin compatible tubes in the preamplifier will result in more distortion, making it sound different and maybe louder. Some people can like it.
Most importantly, such haphazard substitution might wreck havoc with the circuit's operating DC parameters, due to the large differences in the internal parameters. Some circuits, particularly those relying on NFB, might be less sensitive, but others will exhibit strong effect. In some cases the unit's external characteristics will be negatively affected.
Victor Khomenko
Balanced Audio Technology
Victor Khomenko
Balanced Audio Technology
Now in 2021 is there even any stock of 6H30DR's left anywhere? If there is I can't find it. I have a complete set in my Rex2 as those are the only tubes that have ever been run in it. Its going to be time for replacements one day and I'm not seeing that they are really in stock anywhere??
George
George
Russian 6H30p-DR Audio Tubes - www.thetubestore.com
Russian 6H30p-DR - in stock and ready to ship!
www.thetubestore.com
Their website states "Email me when back in stock" and has for the better part of the past year.Russian 6H30p-DR Audio Tubes - www.thetubestore.com
Russian 6H30p-DR - in stock and ready to ship!
Hi George,
For the product of your caliber I would only recommend using the original NOS tubes. They are still available on ebay. There is at least one reliable seller there, many of our customers bought the tubes from him, they are legit - I looked at them at their request. I think his price is also very good. I presume he still has them.
Victor Khomenko
Balanced Audio Technology
For the product of your caliber I would only recommend using the original NOS tubes. They are still available on ebay. There is at least one reliable seller there, many of our customers bought the tubes from him, they are legit - I looked at them at their request. I think his price is also very good. I presume he still has them.
Victor Khomenko
Balanced Audio Technology
Sorry.. saw their message in stock and ready to ship ?!? I hate when they do that.. Did you ask Steve or victor at BAT ? They usually stock up or buy out all the NOS tubes they use.
If I upgrade this spring to the Rex3 can it be ordered with NOS tubes? Will the Rex3 still benefit from NOS tubes or was it voiced with newer tubes in mind?
Thanks for the advise and for making such a great preamp!
George
Unfortunately, we no longer sell or use in production the NOS tubes, we only have some left for internal consumption, so your best bet is to buy them from some still available source. My recommendation is to get them while they are still around. Yes, Rex 3 will still benefit from them. The current production tubes are still nowhere near the quality level of the old ones. We still reject too many of them.
Thank you for your kind words!
Victor
Thank you for your kind words!
Victor
A client recently approached me - he was considering tubes from one ebay seller. They looked almost OK to me, but something was still a bit off. He eventually discovered they were fakes. Please be careful when buying such expensive tubes from unknown sources.
Victor
Victor
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