Being offered is this ConOptics model M25D high voltage push-pull power amplifier.    It is clean and in working condition.

ConOptics Model 25D Introduction:

The Model 25D drive electronics is a high voltage push-pull power amplifier capable of output voltage swings in the order of 175v P-P, push-pull. The Model 25D provides output rep rates from DC-30MHz and typical rise and fall times of 8ns.
Technical Overview:
The Model 25D has a maximum output of 175v p-p. The output stage is the only saturating part of the amplifier. Although the amplifier accepts standard TTL drive levels as its input, the entire amplifier with the exception of the output stage is linear. At the very input of the amplifier, a switch allows the user to select either TTL or low level Analog as its required input format.
TTL Input: (Logic high >+2v, <+4.5v, Logic low <+.8v)
This input mode employs a S140 line driver as a buffer between the input signal entering the system and the power amp. This allows the user some latitude on logic highs and lows at the input. As the input section of the amplifier is linear, care must be taken not to drive this section of the amplifier into saturation and cutoff. By virtue of an on-board line driver, the actual input signals may be rather poor and still the internal line driving gate delivers the required signal to the amplifier.
Analog Input:
This input mode is included to allow operation of the Model 25D with the Model 305 Synchronous Countdown. The Model 305 outputs a 0 to +1v, high-speed analog pulse which is used to operate the Model 25D in the “Pulse-Picking” mode. The Analog input should only be selected when driven by the Model 305. Note: For most