RANGER 811H
 
The  RANGER 811H  is Linear Amp UK’s newest addition to their range.
Budget price but not budget quality.....
Svetlana Power
The Ranger uses four vertically mounted Svetlana 811A high-mu power triodes.
The Svetlana 811A has been developed as a high power RF transmitting valve
featuring a low loss ceramic base and a bonded ceramic plate cap insulator.
Two specially designed getters are mounted on the plate for superior gas absorption.
These are far more effective than the flash getters silvered on the inside of
the glass, as used on receiving tubes.
Toroidal transformer
As with all our models, the Ranger 811H has a toroidal transformer providing the
power into our standard voltage doubler board.  Toroidal transformers have such a
good power to weight ratio.  This particular one also provides the heater supply to
the valves and the 12V control for the relays etc.
The voltage doubler board is used in preference to a bridge rectifier as it
keeps the AC volts down. The board has eight 220uF, 400V capacitors to give
more than adequate smoothing to the 1700V DC.
800 Watts O/P CW or SSB
With the four 811A valves in parallel the Ranger produces an easy 800W on CW or SSB.
It can even be used at up to 400 W on RTTY and other data modes. The power increase
from a 100W transceiver running barefoot to a modest amplifier makes all the difference.
You, too, can get those elusive DX stations  !!
Input Tuned Circuit
Each band has its own tuned I/P so your radio sees a 50ohm load to get maximum drive.
Output Pi-network
Optimum Q is achieved on each band with separate band switch positions on
10, 12, 15, 17, 20, 30, 40, 80 and 160 metres.
With each band having its own position on the band change switch and individual
tap on the coil, this makes ‘twitchy’ tuning a thing of the past.
6:1 reduction drives for Tune and Load
Tuning is also enhanced by the use of Jackson 6:1 ball drives on both the
Tune and Load capacitors. These enable you to really fine-tune so easily,
even if you’re not used to doing it.
Wide-spaced Tune and Load capacitors
The Ranger, like all our HF amplifiers, uses an exclusive modular capacitor
combining both tune and load in one unit. No other amplifier has such a
heavy-duty air spaced capacitor which cannot flash over.
Quiet cooling
The Ranger 811H is cooled with a 120mm, low noise, Papst fan, which gives
excellent cooling but is so quiet you will hardly know that it is running.
 
Front panel features include two backlit, flush-mounted meters, which show plate
current and grid current.  The grid meter also doubles as a relative RF power O/P
meter, selectable on the front panel. Fully adjustable ALC is controlled from the front
panel so you need not worry about exceeding a preset level of O/P power.
TX/Standby switch means you can run on transceiver power only, but with the
amplifier ready to leap into action instantly.
Specifications
Supply  220-240V, 50-60Hz @ 8A
Control 12V @ 150mA
Drive  10 – 100W
O/P power 800Watts  CW, SSB      400W  RTTY
Dimensions W 360mm H 240mm D 405mm
  W 14in  H 9.5in D 16in
Weight  25kg


 

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