(1 PAIR) 408A Western Electric used/good 1964-1969 (76/60 and 74/60)

1 pair) 408A Western Electric used/good 1964-1969

1 tube) 76/60 (1964)

1 tube) 74/60 (1969)

Tested on B&K

above 70 is good

20V Filament

– Yamamoto HA-02 Headphone Amp
– Little Dot Hybrid I+