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    TAD 5AR4 cryo treated rectifier tube

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    Feistygoat

    Posts : 15
    Join date : 2012-02-13

    TAD 5AR4 cryo treated rectifier tube

    Post by Feistygoat on Thu Mar 01, 2012 4:19 pm

    Hey all,

    Anybody try these tube amp doctor GZ34's in their amp yet?

    I was wondering how they sound. So they've got a nice look, and if anybody's had good experience with them, I may give them a shot

    Bob Latino
    Admin

    Posts : 2378
    Join date : 2008-11-27
    Location : Massachusetts

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by Bob Latino on Thu Mar 01, 2012 4:43 pm

    The TAD (Tube Amp Doctor) 5AR4/GZ34 is a selected and tested Shuguang (Chinese) GZ34 sold out of the Netherlands (I believe). It is the same as the Ruby GZ34 which is marketed here in the USA ..

    Bob

    Feistygoat

    Posts : 15
    Join date : 2012-02-13

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by Feistygoat on Thu Mar 01, 2012 5:07 pm

    Great thanks,
    I actually have some valve art (which I believe are also the same) el34's that I've been impressed with.
    I suppose I'll pick one up in case my RCA rectifier burns out

    Tube Nube

    Posts : 603
    Join date : 2008-12-07
    Age : 53
    Location : Calgary, AB

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by Tube Nube on Thu Mar 01, 2012 10:09 pm

    Doesn't the cryo treatment add quite a premium to the price tag?

    I guess the fantasy is that things brought back from cryogenic freezing shall have a renewed lease on life, whether animate or, now with tubes, inanimate.

    Seriously, I'd be interested to know if any of our forum members have tried and heard a difference.

    Feistygoat

    Posts : 15
    Join date : 2012-02-13

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by Feistygoat on Thu Mar 01, 2012 10:24 pm

    Ditto - all Im concerned with is if there's any tangible audible difference

    PeterCapo

    Posts : 380
    Join date : 2008-12-05

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by PeterCapo on Fri Mar 02, 2012 10:05 pm

    I bought a pair of JJ 12DW7 for my Stereo 35 but was not impressed with the way this particular pair sounded. Then, for the heck of it, I thought I might try sending them out for cryogenic treatment. When they came back, I was surprised to find them sounding substantially better. This is all the experience I have had so far with cryo’d tubes, but, based upon it, I would try it again.

    Peter

    Blitzen

    Posts : 47
    Join date : 2009-07-10

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by Blitzen on Sat Mar 03, 2012 12:39 am

    A signal tube, as in the 12DW7, is quite a different story than a rectifier when it comes to an audible difference.
    If you want to pay more for a cryo rectifier go ahead- paying more makes things sound better.
    If these were guitar amplifiers we're talking about it would be a different story. Rectifiers can make more of a difference with an amplifier that's being pushed hard.

    Dheick

    Posts : 13
    Join date : 2012-01-10

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by Dheick on Sat Mar 03, 2012 3:39 pm

    I tried one, It was not cyro treated. but I put it in an amp that had a problem. The tube plates turned red and it burned out. It was dead even on the tube tester. So I just put it aside and about a year later I tried the tube in another amp and it has been working for about 3 months now. I'm not sure you will hear much diffrence in the sound by changing the rectifire tube.


    PeterCapo

    Posts : 380
    Join date : 2008-12-05

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by PeterCapo on Sat Mar 03, 2012 10:34 pm

    As far as whether different rectifier tubes "sound" different, I've rolled different rectifiers in my Cary SLI-80 integrated, and both my wife and I do hear differences between different rectifier tubes. Whether a given rectifier sounds better cryogenically treated than non-cryogenically treated is another matter that I have no specific experience with.

    I think a more important question might be about reliability of the new production 5AR4. Even up until recently, there has been some variation in the posts I've read in different forums. My overall impression from what I have read is that the Sovtek 5AR4 might be one of the more reliable in current production. It seems that the Chinese 5AR4 needs some kind of screening and selection to be a reliable choice with the JJ 5AR4 bringing up the rear(?) Please chime in if you guys have had this or different experiences.

    Feistygoat, maybe you can kill two birds with one stone. It's not a terribly expensive proposition, but maybe could consider getting one non-cryo'd Sovtek or Chinese 5AR4 as well as one cryo'd version of the very same tube, and then do your own comparison.

    Feistygoat

    Posts : 15
    Join date : 2012-02-13

    Re: TAD 5AR4 cryo treated rectifier tube

    Post by Feistygoat on Sun Mar 04, 2012 3:53 am

    Peter,
    I more than likely will, but What blitzen was saying about rectifiers making more of a difference at higher output levels make sense. I have a NOS RCA 5ar4 as well as a new JJ Tesla, and I can't distinguish between the two in comparisons. Then again, I think my Valve Art EL-34's sound as good as my vintage Telefunken EL-34's...either my ear isn't as refined as other people's, or too many loud concerts in the past have left me with less than optimal hearing. Nevertheless, I'll experiment and let you guys know - after all, I'll get bored if I can't fiddle with my audio equipment. There's always something else to try.

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