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Just went from GZ34 to GZ33

206.228.222.37

In Reply to: RE: GZ34 vs GZ37 posted by Hujo on May 27, 2009 at 17:24:07

GZ33 sounds much better to me in my Supratek Chenin preamp. More soundstage, more sparkle - and a whole lot better looking. And it's designed to handle much higher currents than the GZ37. By the way, the voltages to the output tubes remained exactly the same when switching from GZ34 to GZ33, not even 1 volt difference.

Follow Ups:

GZ37 and GZ33 current capabilities are essentially equal... - Steve O 11:00:42 05/30/09 (3)
...Actually, the GZ37 will handle a bit more current with L input filter. PIV capability is higher in all cases.
- RE: GZ37 and GZ33 current capabilities are essentially equal... - Maxamillion 21:29:00 05/30/09 (2)
  GZ33 high current:
  - http://www.r-type.org/exhib/aad0148.htm (Open in New Window)
  - RE: GZ37 and GZ33 current capabilities are essentially equal... - Maxamillion 21:33:43 05/30/09 (1)
    Hmmm, my text was cut off - GZ33 can handle a much larger first input cap (200uF vs 16uF) thus much higher peak current handling.
    - Check This Out.... - Steve O 18:30:07 05/31/09 (0)
      Based on the Mullard data sheets, I'd say that the GZ37 is equal to the GZ33 WRT peak current capability. The 37 is also equal to the 33 WRT max continuous current with cap input filter and exceeds the 33 when using a choke input filter.
      Not sure where your max cap values come from. The Mullard data sheet indicates 60uF max for the 33 under the specific conditions of PT RMS voltage AND effective sec impedance. I've never seen a max cap value for the 37 although 4uF is shown as typical . Actually, the max cap spec is a very fuzzy thing because it's influenced by both the voltage of the PT secondary and the effective impedance of the secondary. If one wanted, one could use a 1F input cap with sufficient series impedance.
      Overall, in light of the fact that the peak current capabilities of the 33 and 37 are equal, it's safe to conclude that max cap capabilities are essentially equal too. Morgan Jones covers this in a bit more detail and comes to the same conclusion.
      
      Edits: 05/31/09 05/31/09 05/31/09

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