[Premium-Rx] Rohde & Swarz VHF amplifier

[w3sz]

This is a bit off topic, but I am posting it here as I think this audience  
is most likely to be able to help me.

A friend has asked me to help him get information on a Rohde & Swarz VHF  
amplifier/power supply that consists of 2 rack mounted chassis.  It is in  
superb physical condition, and the two units have the numbers HS 604/2  
FHrH9621/8 and HS 602/2 FNrH6153/19.

I am told that it was originally designed for 108 MHz, but that it had  
been modified to work at 150 MHz.  Judging from the styling, I am guessing  
that it is from the 1960's or very early 1970's.

Does anyone have any information on this piece of gear e.g. schematics,  
likely range of valuation, published performance specifications?

Thank you in advance, and 73,

-- 
Roger Rehr
W3SZ
http://www.qsl.net/w3sz