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    GZ-33 tube in an ST-120 amp

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    kevinmi

    Posts : 54
    Join date : 2009-11-17

    GZ-33 tube in an ST-120 amp

    Post by kevinmi on Sun Apr 21, 2013 7:22 pm

    I just put a GZ-33 rectifier tube in place of my GZ-34 rectifier tube in my ST-120 amp, and I swear to God it sounds better! The amp seems faster on the attacks, and overall more detailed. Maybe it's all in my head, or maybe my GZ-34 tube was weak. An added plus: that 5 inch tall tube looks great all lit up!
    I know it is common to think you hear "better" results after spending money on upgrades, but I'm just happy that the sound isn't any worse than before the swap. With my highly efficeint speakers (105db/1 watt), it is easy to hear small differences, and I'm convinced the sound is better. That's my story and I'm sticking with it!
    I'm still going to put in the Weber Copper Cap rectifier and do a comparison in a week or so, and I'll post my opinions then.

    sKiZo

    Posts : 1313
    Join date : 2013-04-01
    Location : Michigan USA

    Re: GZ-33 tube in an ST-120 amp

    Post by sKiZo on Sun Apr 21, 2013 8:50 pm

    I've heard good things about the GZ-33. And besides, bigger is ALWAYS better!

    I just pulled the trigger on a Philips 5R4GYS. Stands almost 5" tall and it's a clear top, so it should light up pretty good.

    AssUming nothing explodes. I have it on good authority that it probably won't.

    I've also got a copper cap. I expect I'll shuffle that in - gotta build the amp first!



    Zimmer64

    Posts : 113
    Join date : 2013-01-29
    Age : 52
    Location : Switzerland

    Re: GZ-33 tube in an ST-120 amp

    Post by Zimmer64 on Mon Apr 22, 2013 3:26 pm

    I had two NOS GZ 33 in my VTA ST-70. I also swore that the sound was better than with 5AR4 / GZ34. Unfortunately, they both went bad quickly Sad .

    As this got a bit pricey at 100$ a week, I gave up. I hope you have better luck, as I really liked the sound!

    Best

    Michael

    sKiZo

    Posts : 1313
    Join date : 2013-04-01
    Location : Michigan USA

    Re: GZ-33 tube in an ST-120 amp

    Post by sKiZo on Mon Apr 22, 2013 4:40 pm

    Expensive habit there ... if you ever find yourself feeling that's a reasonable price to pay, I strongly suggest an intervention or 12 step plan ...

    Hope I have better luck with my Philips 5R4GYS ... wouldn't want to have to replace that often, even at $40 a pOp!

    kevinmi

    Posts : 54
    Join date : 2009-11-17

    Re: GZ-33 tube in an ST-120 amp

    Post by kevinmi on Sun Apr 28, 2013 2:11 pm

    pic of GZ33 tube[img][/img]

    sKiZo

    Posts : 1313
    Join date : 2013-04-01
    Location : Michigan USA

    Re: GZ-33 tube in an ST-120 amp

    Post by sKiZo on Sun Apr 28, 2013 5:34 pm

    Just got the Philips 5R4GYS in the mail the other day. Here it is compared to the 5AR4 and the copper cap ...



    Looks to be about the same size as the GZ-33?


    kevinmi

    Posts : 54
    Join date : 2009-11-17

    Re: GZ-33 tube in an ST-120 amp

    Post by kevinmi on Mon Apr 29, 2013 4:01 pm

    GZ33 vs GZ34[img][/img]

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