1 Pair) EL34 Mullard Philips XF3 and XF4 

1 tube) 106.5ma Gm=12,400 (used/strong 1975 (xf4-B5L2) in white box)

1 tube) 101.8ma Gm=12,300 (NOS 1974 (xf3-B4A4) in white box)

Recommended for

- Diezel Stereo Guitar Amplifier
- CARR amplifiers
- Marantz 2
- Manley Snapper