1 Matched Pair) CV378=GZ37 Mullard England NOS all with (XD=1966) date codes in original boxes 

1 tube) 51/40 and 51/40 (XD) 1S1-B6C3

1 tube) 51/40 and 51/40 (XD) 1S1-B6D2

Test results on TV-7D/U

Recommended for

- SET amps
- Allnic H-3000 phono
- Allnic 300B SET
- Art Audio 300B amp
- Art Audio PX25 amp