6688

The 6688 (European equivalent E180F) is a miniature pentode with a B9A (Noval) miniature 9-pin base.

It is used in:

• the staircase generator circuit of the 3T77
• the 80P cathode-follower probe

Links

• Raytheon CK 6688 Datasheet (PDF)
• 6688 @ radiomuseum.org

Pictures

• 

  80P probe internal view