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In Reply to: RE: Haven't needed any tubes in a while BUT when... posted by musetap on July 25, 2016 at 10:14:32
...and totally enjoy the results. His current requirements with that VM unit are easy on a 5V4GA; Plus, the 5V4 will sound very similar to a "real" 5AR4/GZ34. 5V4G is also very underrated and its' ST "coke bottle" shape looks very cool.
5U4G or GB is a 5V/3A rectifier. 5R4G, 5V4G or GA, GZ32, GZ34/5AR4, 5Y3G or GT are all 5V/2A rectifiers. Any of these 5V/2A rectifier tubes will sound a bit "different" than the 5U4. Many folks insist that the "voltage drop" spec indicates the sound differences. Having performed tube rectifier "shootouts," I assure all listeners that the voltage drop spec does not tell all. Even rectifiers that have the same "drop" in voltage can easily sound different. Musetap heard this legitimately for himself with original GZ34 types. Common consensus is 5R4 and 5Y3 types yield the smoothest mids, as can a 5U4. GZ types and the 5V4 always seem to yield tighter yet punchier, well defined bass.
Less pricey 5AR4/GZ34s were available from GE and RCA (and other brands) with their made in the USA offerings of decades gone by. Also, Japan made a nice GZ34 and 5AR4 a few decades ago. These "bargains" should now cost less than $60. each, easily. If epay is the reference, good, used GZ34s can be bought for only a bit more. Knowing which vintage original British or Dutch GZ34 to really go after is the key; but, remember online we compete with the world. Any "real" Mullard GZ34 is going to sound real good. However, the earliest versions are coveted for their sonics; not simply rarity.
Without a doubt, Popsy, plug in a $30. shipped to your door 5V4G or GA ASAP and wait on the real deal of a GZ34 down the road. While you are at it, get a $10. 5R4G and hear the sweet mids...Enjoy the journey....
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The Mind has No Firewall~ U.S. Army War College.
IME, these work well in most units that take GZ34 as OEM. There is a small difference, esp in transient response. But, they are tough tubes, good life.
And you can get them relatively cheap. I like the Tungsol BP and the CBS-Hytron 5U4GB. But, the RCA, GE, and Sylvania ones are just as good.
a 1956 GE 5U4GA/GB black plate...so will be interesting to hear the difference with a 5AR4 tube in the circuit...
Be sure to check new plate voltages and re-bias, when changing any rectifier.
Good luck!
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