[R-390] 6082 Question-- Fans
Bruce Hagen
bhagen at msn.com
Sun Jan 16 18:52:37 EST 2005
Hi All:
If I may put my two cents worth in here - from what I've learned in
the audio business it does not take a whale of a lot of air movement
to go from fried to happy.
Bruce
----- Original Message -----
From: "Dave or Debbie Metz" <dmetz at ntelos.net>
To: <r-390 at mailman.qth.net>
Sent: Sunday, January 16, 2005 11:23 AM
Subject: Re: [R-390] 6082 Question-- Fans
> At the risk of the sharp tongues, here goes. I added a 220v muffin fan to
> blow on those hot devils and run it on 120v. Very quiet and solves a big
> problem. However, one needs to make room for it so my solution was to
> remove the big electrolyitc and replace it with a new modern version that
> was much reduced size. It's been running that way for at least 5 years
> about 6 months at a time and no failures. The "replaced" cap is carefully
> stowed away for future generations but in the mean time, I want to use it
> without concerns as to heat which the signal corps knew was a problem from
> almost day one.
> 73's
> dave
>
>
>
>
> At 10:58 AM 1/16/2005, Bob Camp wrote:
> >Hi
> >
> >A fan is not a bad idea at all. The main issues with one seem to be noise
> >and how to mount it. Probably the only better idea is two fans (one
> >above
> >and one below the radio).
> >
> >These days you can get fans that are pretty quiet acoustically. One of
> >the
> >common things to do seems to be to run a DC fan at half it's rated
> >voltage. The air flow goes down quite a bit at half voltage but you don't
> >need a hurricane to cool off a R-390. About all that leaves is RF noise
> >from the fan....
> >
> >Coming up with a way to mount the fans without cutting up the radio is an
> >important part of the process. I can see no reason to chop holes in the
> >radio simply for cooling, though that has been suggested in the past. One
> >way or another you would need to come up with an external mount for the
> >fans. Simply setting them on the radio sounds like an accident in the
> >making ....
> >
> >Air flow at least takes the temperature of the top of the modules down.
> >It
> >indirectly impacts the temperature inside the module as well. That said
> >there's still some heat inside the modules.
> >
> >There are a couple of high power resistors in the cathode's of the 6082's
> >that seem to run a bit hot. Often these are reported as being well out of
> >tolerance (like say 2 or 3X the rated value). If you do replace them
> >recommendations have been made in the past to bump up the dissipation
> >rating of these parts. Obviously the resulting radio would not be "100%
> >natural / organically grown".
> >
> >A lot of this comes down to what your objective is. Everybody would love
> >to have a 100% original radio and have it work perfectly in all respects
> >24/7. Those of us without access to 100's of radios may have to choose
> >between one or the other.
> >
> > Take Care
> >
> > Bob Camp
> > KB8TQ
> >
> >
> >On Jan 15, 2005, at 10:01 AM, Michael Murphy wrote:
> >
> >>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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