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Two beautiful vintage Mullards here. 53yo.
The GZ33 rectifiers from Blackburn UK. These have been waiting in their boxes since March 1964.

* From the same batch, B4C4 (late March 1964)
* Brown low-loss micanol bases.
* Totally clean tops, unused.
* Mint boxes and white print

These GZ33 rectifiers have powerful cathodes good for 250mA current.

And can also take up to 60 microfarads of filter capacitor. Plus up to 500V AC rms on each anode.

They can easily be used instead of the weaker GZ32 and GZ34, but the filament current is about 800 milliamps more .So your power tranny will have to be ok supplying another 4VA ie 4 watts. Mostly this is not an issue.
...But research on your device may be wise.

The AVO163 test showed the anodes totally balanced, and both valves are basically identical to each other. Current-test is 100%.


These heavy-cathode GZ33 have another bonus- they take almost 30 seconds to warm up. So this slow and gentle warmup means the other valves are totally heated before getting their HT.

And the base on this original old style of valve/envelope design runs much cooler, which is always a good thing.




No overseas shipping
Payment within 4 working days or else relist/offer

See my other stuff for valve preamp / amp tubes and radio / fender marshall guitar amplifier valves
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  • NZ post redbag tracked$8.00
  • As above, rural$12.00
  • combining with another win, or sort out later$0.00
  • Seller does not allow pick-ups
  • Seller location: Upper Hutt City, Wellington, NZ

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