Quote:
Originally Posted by wa2ise
Early damper diodes (like 6W4) probably didn't have quite enough H-K insulation, as compared to later ones. Look at a late version, you'd see a spiral of whitish coated wire? between the heater and the cathode.
The isolation transformer was probably a solution to avoid having to replace the tube every few months, which consumers would not like at all...
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I never used 6W4's in sets, newer or older. The only tubes I carried was 6AX4 and 6AU4 and the series counterparts.
You couldn't use the Raytheon Japanese 6CJ3/6DW4 in Zenith color sets. The heater current wasn't right. The regulator and damper tube heaters were in series. In those sets, you had to use a GE or Zenith branded 6CJ3/6DW4.
