[R-390] 6082 Question

[Michael Murphy]

True Bob,

An efficient switcher running at a nice high frequency like say 455 kHz -
could double as a BFO?.. hmm

How about a combined 100 kHz power supply marker generator?

Speaking of heat, My ART-13 would melt if I did not do something to get the
heat out. The design is just too darned tight and the 813, 811's and 1625's
really heat up when the thing is in standby at the higher (450 VDC medium
voltage and High V 1500V) that I run . If I was in a B-24 at 12000 feet I
suspect all would be OK.  I will admit it - I use a big-ol muffin fan with a
sand resistor in series with it to slow it down a bit, blowing out. Keeps
the radio cool and helps to heat the radio shack and best of all the tubes
have never had to be replaced. Why not apply this primitive approach to the
R390 series?

Mike Murphy WB2UID

----- Original Message ----- 
From: "Bob Camp" <ham at cq.nu>
To: "Kenneth G. Gordon" <kgordon at moscow.com>; "R-390 HF Receiver List"
<r-390 at mailman.qth.net>
Sent: Saturday, January 15, 2005 11:11 PM
Subject: Re: [R-390] 6082 Question


> Hi
>
> Well the main way you get the power out is to use regulating devices
> that do not have filaments in them. That puts it more in the category
> of redesign rather than modification.
>
> I hope that doesn't stir anything more up.
>
> Take Care!
>
> Bob Camp
> KB8TQ
>
>
> On Jan 15, 2005, at 3:06 PM, Kenneth G. Gordon wrote:
>
> > Dave Metz wrote:
> >
> >> Tom,
> >> There is an article in Hollow State Newsletter within the last couple
> >> of
> >> years detailing a conversion that eliminates them and the huge heat
> >> they
> >> create. By Dr. Jerry
> >> dave
> >
> > Sigh...I sure wish I had known that when I still owned an R-390/URR,
> > serial number 21. I had to replace two charred sockets once. I was
> > amazed at the heat those things put out, especially when they were
> > gassy.
> >
> > Ken W7EKB
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