[ICOM] Icom 781 heat problem

[Peter Veach]

I bought a 100 volt step down transformer from a 'travel' website. Works
great.

-Pete


-----Original Message-----
From: icom-bounces at mailman.qth.net
[mailto:icom-bounces at mailman.qth.net]On Behalf Of Adam Farson
Sent: Friday, January 07, 2005 2:12 PM
To: 'ICOM Reflector'
Subject: RE: [ICOM] Icom 781 heat problem


Hi Sam,

There is an alternative: Reduce the mains supply voltage to 100V, using a
Variac or bucking transformer. This will reduce the dissipation of the shunt
regulator in the power supply by a whopping 44%.

I would not recommend drilling holes in the IC-7800 cabinet. The radio is
fast becoming a classic, and such modifications will greatly diminish its
resale value. You can probably fabricate a copy of the PSU heatsink cover
plate, as in the Sherwood mod, cut the necessary holes in your copy, and
mount a small muffin fan on that.