1) I only had one FBT bad in a hybrid & it was a massive kit.
2) never had a bad yoke I remember.
3) WARNING ! seems no two of these had the same hoz/HV so
dont get tripped up by that.
4) 212-139-01 is Zenith OEM P##
5) only HV regulation probs I remember were bad spots on the HV pot.
So often we kept a strip of them in stock. VDR's went bad in older chassii.
6) If the HO is getting good drive suspect a weak HO tube. Trouble is
they are BIG bucks. 6LF6 & 6LX6 will sub, on series hybrids
20LF6 & 26LX6 will sub.
7)Tripler can do it but they usually cracked open & burned or looked swollen / discolored.
enuf fer now
73 Zeno
LFOD !