The 101E uses 6JS6s, not 6146s. Check and see if they are American tubes or
original Toshiba. Most of the original ones had a green stripe around them,
but the white letter Toshibas will work just fine. If they are Toshibas you
should not have a problem neutralizing them unless one or both of the tubes are
bad. If they are American tubes, you will need to change C125, the 100 pF
mylar block cap (that is in line with the tunable neutralization cap) to 10 to
15 pF. Then try neutralization.

Good luck!