PL−4D21, Penta Laboratories Vacuum Tube

tube 4d21

PL−4D21, Penta Laboratories Vacuum Tube

Part Number:
(TUR) 4D21

Product Details:
PL−4D21, Penta Laboratories

For a $6 up charge ($5 for 20 tubes or more of same number), individual Roe Tester V10 printouts with curves will be included with individual tubes. This test takes about 10 minutes for each test. The calibrated ROE Tester is the finest test tube testing system available. It will document every operating parameter of the subject tube.

NOTE: Sweep Tubes are not warranted in any way due to wide and variable operating conditions.


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Tubes: Transmitting & Receiving Starting with 4

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