The IC looks like an old HP traveling wave amplifier, but what¡¯s around it does not look like it was made at HP. The gate voltage (bottom left pin with the wire going to the feedthrough) is quite likely adjusted to give a certain drain current, so it won¡¯t be a fixed number on the data sheet. Vd is probably 5-7V. Sorry, I don't have the data sheet.
Valdan
