Has anyone tried a NOS 5V4GA in a Maz 8 yet? I know it will work just fine, but I'm curious how you liked it before I order one.
My JJ GZ34 is rattling like crazy and driving me nuts! Not an issue for gigs, but it'd be nice to avoid it. I'm usually fine with new production tubes, but I've had a lot of rattling rectifier tubes lately.
Yup, I tried one in my Maz 8. In pentode mode I couldn't tell any difference between a NOS 5V4GA and a NOS 5AR4. In triode mode, I like the NOS 5AR4 a little better. The difference was subtle, but the amp seemed to lose something with the 5V4GA. I keep the 5V4 as a backup.
(dergit)Markus did a good video comparison in this thread in the Tubes topic :
Post by premiumplus (Dave) on Nov 3, 2017 9:32:47 GMT -7
I had a 5v4 in my Maz 18NR for a month or two, and it fell apart (the glass separated from the base) I glued it which didn't hold, and finally gave up and went back to the 5AR4. I'm glad I did, because the amp just sounds overall better with it. The 5V4 tended to make it lose it's immediacy and the low end got loose. Bottom line is Doc knows which tube sounds best, and he ships his new amps with them. I just can't advise any changes. I've even tried NOS tubes and they really don't sound better, at least to my ears. Doc really knows his craft and it is humbling to admit that after working on amps for my whole life (I'm a 65 year old retired electrical engineer) that I can't make his amps better. Z amps are the ONLY ones that I can honestly say this about. I'm pretty good at voicing amps but Doc stands WAY ABOVE me. He's great. I'm good. End of story!!!
"Tone, tone, tone, tone. Is there a substitute?" -Dr.Z
Same here. I've been working on amps for 40 years or so. All my other amps are tweaked in some way. I've never had a desire to do anything to my Z's other than install some NOS tubes and change speakers and I usually wind up with one of the original options. I haven't even looked inside except for briefly a MAZ 38, which was my first Z. I was more than satisfied that the workmanship was first rate and I couldn't do anything to improve it. Time is better spent fussing about other gear.
Post by Chilly Gibbons (Todd T.) on Nov 3, 2017 13:51:33 GMT -7
Me three, I’ve given up trying to improve Zs, inside or outside of the chassis. I use the Z website page under Support-Tube Info or just look at the tubes the amps ship with and get exact replacements. Doc makes it easy.
Z-Lux Combo in Black, Z-Lux Head/1x12 Z Cab in Red, Cure, Maz 8 Head/1x12 Z Cab In Black, another Maz 8 head/1x12 cab in blond, blond Z-Verb, Red Z-Verb, Maz 18 NR MKII in Black, Therapy blonde, Red Monza, Air Brake, and few more now, but who is counting? Past: Monza 1x10 in Red, Mini Head in Red, Maz 18 Head in Black (Baby come back...)
Thinking about this one some more... since this is a single ended, true class A amp, you're not going to have any sag or change in current, so there really shouldn't be a difference in "feel" between the two rectifier tubes in this amp.
The 5V4GA impedance is a little lower than the 5AR4 (100ohm vs ~180ohm), so the B+ will be a bit higher, which could account for a small change in sound.
I may give it a shot and see. It's really not about sounding better than it is about reliability and lack of rattle. It's pretty easy to find a good quality NOS 5V4GA compared to the big $$$ people pay for a NOS GZ34.
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roscoenyc: I have never in my life experienced tube rattle. That said, I've only been playing electric guitar for 49 years.
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capofirstfret: I've experienced tube rattle in two different amps that I've had. In both cases I bought the rubber rings from Eurotubes and it fixed it for me.
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