The 127A is the same as the 3-100D2 transmitting triode. Filament is 5 volts @ 10.5 amperes. Max plate ratings: 2000 volts, 210 ma, Pd = 100 watt. If you look closely you can see that the plate is similar to that on the 100T. The top two pins are for the plate connection, the middle pins are for the grid. The VT-327A is similar but has only one plate connection at the top. Note the plate looks the same as used in the 304TL. Both tubes have uranium glass at the bottom.