All tubes are tested on a professionally calibrated Triplett 3444.The Triplett 3444 tester does not provide numerical test values for these rectifier tubes, but rather indicates if they are good...which they are. For comparison purposes, I have posted values where the needle settled on the scale. You can see that all three tubes are nearly identical!
Mullard 6X4/EZ90 (Blackburn) Black Plate Square Getter Trio. $39/trio Free Shipping Tube #1: Heath by Mullard label 36/37 Date Code: B9E Tube #2: Sonotube label (Mullard) 37/37 Date Code: B0I Tube #3: Mullard label 36.5/37 Date Code: B7L
No Gas or Shorts on any of the three. 5 Day Return Policy - I endeavor to thoroughly test your tubes before shipment to ensure that I represent them accurately. If they do not perform as expected in your system - microphonics or noise for example, then you may return them for a full refund. Buyer pays return insured shipping. The 5 Day Return is not intended to provide a Buy-Try-And-Return method by which a Buyer can "tube roll" and return them if they do not produce a subjectively pleasing result.
USA Sales Only
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