Would all 2BU2s have X-ray filter glass?

[Findm-Keepm]

Originally Posted by bandersen

Interesting article. It reminded me of the 3DR3 tube that has lead shielding to block x-rays.

Don't forget the 3DS3 as well - it's the "preferred" type by my GE Tube manual. Probably higher current or HV rating. The rubberized lead shielding allowed the HV rectifier to be used without a cage in GE KE chassis sets and a few Sears-Simpson badged GEs as well. Your 3DR3 was probably used in Sears' 17 inch Color sets, as was the GEs. 3DS3 was used in the 19KD/KE chassis.

Cheers,

[Findm-Keepm]

Let me correct myself - it's actually a rubberized coating that protects the ferrite shielding around the tube. US Patent 3725718 is germane. Stackpole patent, no doubt licensed by GE. I can't find the patent number anywhere on either of my tubes or boxes.


Cheers,