This multi cavity UHF amplifier klystron can generate peak powers of 6.5 kW and the collector can dissipate 1 KW. Drive power is around 3.25 Watts. The frequency of operation is 0.96 - 1.215 GHz. The STC commercial Type code is Z211/1G.
Amplifier Klystrons like this one are fitted into external resonant cavities and contact is made via the 71 mm diameter brass rings.
This shows the collector end with the cooling fins that are designed for forced air cooling.
The electron gun with three flying leads on the left.
One of the sets of connecting rings.
The makers name and own Type code.
The other side of the base is the CV number.
The wide glass tube envelope is 57 mm in diameter, and including the base is 590 mm tall.