[Premium-Rx] Racal RF preamp

[GandalfG8 at aol.com]

Hi Tom
You raise some interesting issues on this one.
I found an online reference a while ago to the "rare" 6790 RF amp.
The external and internal photos, and schematic, looked to be identical to 
the amp fitted to the 1792.
I have a spare amp and was planning to fit that to my 6790/GM but was advised 
that the 6790 overloads with the amp fitted so I left well alone.
Although fitted as standard to the 1792 there are internal links which will 
bypass the amp but I've not heard of anyone doing that.
Certainly my 6790 seems just as sensitive without the amp as the 1792 does 
with it but I must admit that I haven't done any measurements to confirm that.
I don't know that the 1792 front end was dodgy but do wonder, despite other 
similarities, if the gain distribution in these two receivers is different.
regards
Nigel Clarke
G8PZR


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