[Johnson] Re: DO NOT Solid State the Power Supply in your Ranger!!

[Larry Knapp]

I have to agree with Glen here.  There are most likely thousands of solid state
power supplies in use for Heath, Drake and Collins....most likely others.  The
Heath and Drake transmitters do not come with fans.  In all the Drake forums a
constant is to get the Drake transceivers and transmitters fans to cool them
down.  I would believe it's the heat coming from the 6JB6's that perhaps may
cause failure over time in these units...be they tubes or components.  My R4B
can run hours with what I consider normal heat from the components used. 
However, when I use my TR4CW or my T4XB, the heat from these units is huge. 
Fans are on both.  I hope this prolongs their life.

73, Larry KC8JX

--- Glen Zook <gzook at yahoo.com> wrote:

As for the problems with your TR-4C tubes, frankly, I have never run into such
in either my equipment or the equipment that I service for others.  I have
worked on various Drake 4-Line equipment that belong to locals that still have
a number of the original tubes in them and have never had to replace a single
tube in any of that equipment.  Thus I cannot recommend anything that may be
wrong in your particular power supply.  But, I have not seen the problem in any
solid-state supplies in either my own equipment or in the numerous units
that have been sent in for alignment, etc., over the years.
 
Glen, K9STH  
 
> --- Sherrill Watkins
> <Sherrill.Watkins at dgs.virginia.gov> wrote:
 
My Drake TR-4C will damage some of its tubes in about 18 months; based about
two or three on-off cycles per day. I have quit using it because of its
tendency to damage tubes so quickly. I plan to install a time-delay relay in
the center tap groud of the power supply to allow the filiments to warm
properly before the B+ is applied before I use it again. My high AC
line voltage (125vac!) doesent help matters.




		
_______________________________
Do you Yahoo!?
Declare Yourself - Register online to vote today!
http://vote.yahoo.com