[Hallicrafters] S-40 series rectifier tubes

[gbrown]

I am going out on a limb here but to the best of my knowledge the S-40 and
"A" models used a #80  and the S-40B changed over to the 5Y3. Also other
tubes were changed from the S-40/A to the S-40B such as the audio output.
Believe there were some others that were changed also. Seen to many and
forget. Must be age or somthing like that. Wife thinks its age, hehehehehe
Regards
Gary...WZ1M

http://Tubes_Tubes_Tubes.tripod.com/tubestubestubes/index.html