• New


17.00 USD

Quality diode glass tubes manufactued in the United States by renowned Raytheon. These fine 8 pin octal based tubes, designed for colour TV receiver service, come with long gray plates, rigid internal supports, and side getters. They are glass etched 6DT4 U.S.A. and printed on base 6DT4 MADE IN U.S.A. RAYTHEON UNILINE with various production codes. Boxes are standard Raytheon red and white printed 6DT4. Photo is typical of available inventory.

Tube Matching
Tube Matching
6.00 USD by tube


A tube may have one, two, or three internal sections depending on the purpose of the tube; somtimes these sections are all the same, sometimes they are different. Due to manufacturing and material tolerances, there may be slight differences between the original specification and the actual tube. Tube matching tests each one of these internal sections and selects tubes, compared to original specifications at manufacture, for balanced performance and good sound.


All our tubes are tested by us prior to packing on our Stark, AVO, Simpson or RF Laboratories Inc. calibrated testers. On request for tube matching, tubes are matched for Mutual Conductance in Micromhos and Plate Current in Milliamps on our Amplitrex or Radioelec Duovac testers, with results printed for each  individual tube. Certain tubes difficult to test are matched for Mutual Conductance in Micromhos only on one of our regular calibrated testers. On request we can also test for Microphonics.


10 Items

Data sheet

8 pin Octal
Boite type
Half-wave rectifier
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