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In Reply to: RE: GZ37 and GZ33 current capabilities are essentially equal... posted by Maxamillion on May 30, 2009 at 21:33:43

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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