[R-390] Dave Curry 6 KC filter for R-390A

Phil tubesareking at yahoo.ca
Tue Mar 14 10:06:34 EST 2006


Steve wrote:

Hi Guys,

Has anybody installed one of these filters in there
R390a and if so 
what do you think of it for the price? $199

Steve,
WA2TTP

Steve, I bought one of these for my R-390A but have
not yet had the chance to take my 1955 Collins R-390A
out of its Hammond table top rack case as yet.  Partly
this is because I recently got a
Stromberg-Carlson[Collins designed] R-392 and have
been enjoying playing with it!

Whether $199 is a good deal or not - well, that
depends.  In my case, my 4 KHz filter is dead.  4 KHz
filters are probably the most likely to go bad and the
hardest and most expensive to find.  So I will use the
6 KHz Dave Curry filter to replace the 4 KHz filter,
giving a filter line up as follows:

.1 KHz CW
1.0 KHz CW
2.0 KHz SSB
6.0 KHz MW DX, SW and "high fi" AM modulated HF
amateur radio
11.0 KHz MW general and "high fi" SW [described as 8
KHz but actually 11!]
16 KHz MW local

I'm primarily a MW DXer, with a secondary interest in
SWL and a tertiary [my big word for the day] interest
in ham].  I also like HiFi audio, so nobody can
convince me to give up that lovely sound 16 KHz.

If my 4 KHz filter worked fine, I would not spend the
$199.  But if my 4 KHz was good but my 8 KHz was dead,
I probably would get the Curry 6 KHz filter too.

The most common is to remove the 16 KHz filter and put
in the 6 KHz Curry unit, but you would never see me do
that!

The Curry unit uses "PC board" lugs.  Translation, use
a low wattage soldering iron and work carefully to
avoid lifting copper traces.

Also, the ER mag reprint which serves as instructions
is kind of vague.  The gist of it is that you do not
use trimmers at all, and do not use the trial and
error pf caps either.

IF output apparently goes WAY up, so if you have just
one Curry filter setting IF gain may be a bit of a
compromise.

But I have heard great things about them.  From a user
point of view, having a brand new filter to use most
of the time, taking the load off the others, is a fine
idea too.

Hope this helps and hope others who have actually used
and installed one will chime in!

Phil Rafuse
PEI Canada


Phil Rafuse 
PEI Canada

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