[R-390] Hammond Cabinets

[Dan Merz]

 Hi,  I used Roy's fan design on my R390 with a 115 vac fan.  I think a 230
vac fan run on 115 vac would be my choice at this time.  I slowed my 115 vac
fan to reduce the speed/noise by putting a resistor in series to get about
half the line voltage on the fan.  If I were doing it again,  I'd just use a
230 vac fan operating on 115 vac and avoid the extra small outboard box with
the resistor.  As I recall,  the small fan I bought was a little too noisy
for me at full speed.  My 390 isn't in a cabinet so I didn't have to deal
with finding a fan thin enough to fit between cabinet and radio. I'll deal
with that aspect when I find a cabinet that costs less than I paid for the
radio (i.e. probably never).  The fan is very quiet,  and I appreciated
Roy's design because it doesn't modify the radio with extra holes.    Dan.

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Roy Morgan
Sent: Saturday, November 27, 2010 11:03 PM
To: r390 list
Subject: Re: [R-390] Hammond Cabinets


On Nov 23, 2010, at 3:17 PM, James Young wrote:

> .... I don't know, and
> have wondered myself, if the CY-979/URR is an appropriate cabinet also 
> for an R-390 or R-391. Any ideas?

Here's my idea:

NO ONE should run an R-390/URR (the "non-A") without a fan.

I made a metal plate to mount a 4 inch square computer fan against the side
of the radio using the existing screws: two frame screws and two bottom
cover screws.  I have a picture of the somewhat crudely made plate including
a ruler to other folks could make one too.  'Glad to send the picture to any
who are interested.  OR: maybe some one could post the thing with my
comments on some web site.

In rack mount and cabinet installations, the fan needs to be mounted after
the radio is in place.  (Does the CY-979 have a lift-up-top?  
Maybe not.)  Cut-out slots for the screws make this do-able if you can get
the the side of the radio from the top, bottom, or rear.

- A Thin fan might slip past the rack or cabinet rail.
- A fan inside the frame would be better.
- Modest air flow can cool the B+ regulator tubes from literally blistering
hot to touchable.
- A capacitor in an AC fan power line can slow it down.
- A 12 volt DC fan run on rectified filament power (6.3 volts, not found in
the non-A) runs quiet and does not need to be switched on/off.

Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!



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