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Rectifier Tubes 5AR4 : New production vs NOS

Hello,

I am currently using a 2005 Cary Audio SLI 80 signature integrated amp. I had been using a new Electro Harmonix 5U4 rectifier tube, but recently was able to try out a new SovTek 5AR4. I was amazed at the meaningful sound improvement a different rectifier tube type can have on my amp. Now, I am considering investing some $ in NOS 5AR4's in the hope that will improve the sound further. However, my assumption had always been that the biggest impact NOS tubes will have over new tubes are in my preamp & driver tubes (6922 and 6SN7), since for these tubes are in the path of the music signal & they were much better made back then than the current production tubes. Would love your thoughts/experience on whether there would be much of a difference between NOS vs New 5AR4 rectifier tubes?

If there is already an extensive thread on this topic - pls point me to it, i haven't found one yet or i might just have missed seeing it online somewhere.

Thanks for your help.
longinc
trelja
3,224 posts
 
I also agree the rectifier is important.

Mullard 5AR4 have set the standard for both sound quality and reliability. Look at how many are still in use, and the prices they command.

Based on Marty's recommendation, I may give the Gold Lion's a try. So far, for new production, I've tried Sovtek, JJ, and Shuguang. As usual, skip the Sovtek. JJs sound great, and a good choice if you don't want to pay for Mullard sound quality. I just wish they were more durable, as they easily arc over, then it's time for a new one. Shuguangs don't sound nearly as good, but have proven exceptionally rugged.
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bigkidz
3,408 posts
 
I agree with the Gold Lion tube. Also Music Full Music 274B if you can swap that one?
longinc OP
35 posts
 
Thank you for all your responses to my question - very informative and helpful!

I have a follow up question - i've heard that the 5AR4's provide a higher supply voltage to the rest of the amp circuitry since the voltage drop across it is less than the 5U4's. Hence, I've been cautioned against using it since it *might* operate some of the downstream components at or higher than their ratings. Anyone had issues with the 5AR4's?
brownsfan
1,508 posts
 
Longinc, It is always best to check with the manufacturer when substituting a similar tube for the specified variety. Some say the slow start up of the 5AR4s can be easier on amps than the 5U4s.
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