Dr George:
I really would reccommend the EMTRON DX1 amplifier recently used in the
Pitcairn VP6BR expedition. The DX1 was send to Jukka from the manufacturer
in VK-land and was in use for, I believe , several weeks without any
problems. I had a chance to see one and it really is impressive. Here some
unique features from the EMTRON paper:
it is vy compact: 365 x 175 x 340
mechanical very much suitable for portable use - transformer may remain
inside during transit
20 kgs
1000W pep SSB or CW out - 750W RTTY
40 -60 watts drive
input swr less than 1,3:1 - there is a 50 oms dummy load at the input
uses one vy cheap Russian GU 74/4CX800 sold surplus here in SM for a
very
low price of 70 dollars
800 watts anode dissipation and is the tube almost indestructible -
military quality
heavy duty C-core transformer and 58 uF condenser banc rated at 3600
volts DC
modular construction for easy service and very high inside quality -
just beautiful
all bands including WARC bands - 9 position switch
instantaneous display of all DC and RF parameters
SWR protection - less than 2:1 or no go
overdrive protection with built-in warning - you simply can not
overdrive the amp
high plate current protection
fully regulated and current limited screen grid supply - regulates neg
and positive currents
fully regulated control grid bias supply
fault diagnosis
optional 2 mS or better QSK system
tube is protected against flash over with a large resistor in series
with anode supply
6:1 vernier for smooth plate and loading tuning
When you go on an expedition you must something reliable and protected that
is this easy to repair. With a DX1 you can bring along extra modules in case
you really want to be sure. But I have a feeling it really is not necessary.
Yes, it is has a slightly noisy cooling system that can be easily improved.
And you really must stay inside the specifications otherwise the protection
circuits cut out.
73s de Hans SM5KI
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