Knights Electrocom

A new base station HF Linear Amplifier, for all bands and all modes 1.5 - 30MHz.

Features include:

1.5 - 30 MHz All-Mode All-Band
250 - 300W Output
Electronic switching
PTT input - ALC output
RF Output Watt Meter
Tunable antenna preamplifier
High antenna SWR protection
Excessive input power protection
Excessive temperature protection
6 Low-pass filter manual selected
Forced multispeed ventilation

Also sold as the SOMMERKAMP SLB-300

Copies of the instruction manual and technical manual can be viewed by clicking on these links.

A single valve (EL509/519) amplifier for base use, powered directly from the mains.

Valve amplifiers tend to give a cleaner signal than their transistorised equivalent, but you do need to allow time for them to warm up and ensure that you tune them correctly.

A solid-state (transistor) amplifier which is powered directly from the mains.
Output can be selected high or low (approx half when on low) and there is a variable 26dB pre-amplifier.

This has the advantage over it's valve equivalent of giving instant output (no warming up) and requiring no tuning.
The disadvantage is that transistors are much less tolerant of a high swr and will blow if the swr is too high.

RM KLV 550  transistorised mains amplifier

A solid-state (transistor) amplifier which is powered directly from the mains.

Output power is variable in 6 stages, giving outputs from approx 50W to 300W (depending also upon input). There is a variable 26dB pre-amplifier.

The front panel also has a 13.5V outlet with a maximum current of 3A.  This is suitable for powering a low power radio or various low power accessories.

This has the advantage over it's valve equivalent of giving instant output (no warming up) and requiring no tuning.
The disadvantage is that transistors are much less tolerant of a high swr and will blow if the swr is too high.