[Heathkit] DX-40 Pwr Xfmr

[Bill Stewart]

Same thing here, Glen plus having to pull the gear out to plug and replug could be a aggravation. But for diff. applications, not a bad idea.
Last night after I went to bed, this ole dummy realized that I've been using the DX-40 (& other BA rigs) on a variac(s) at 115vac ever since I got it. One thing I will do is to pull the modulator tubes in the DX-35 and 40. I only work cw with the BA gear and run them at below normal power. That should reduce the strain on the pwr xfmr a tad.

Tnx to Bill (KU8H) for the idea..and yes, I do build.
Bill K4JYS

----- Original Message -----
From: "Glen Zook" <gzook at yahoo.com>
To: wrcromwell at gmail.com, heathkit at mailman.qth.net
Sent: Tuesday, January 31, 2012 6:04:56 PM
Subject: Re: [Heathkit] DX-40 Pwr Xfmr

I agree that have a separate power supply allows much more latitude in building equipment, repairing, etc.  The only thing is that I usually end up actually using the equipment on a regular basis and therefore have to build still another power supply for the next project!
 
Glen, K9STH Website:  http://k9sth.com


________________________________
 From: Bill Cromwell <wrcromwell at gmail.com>
To: heathkit at mailman.qth.net 
Sent: Tuesday, January 31, 2012 2:26 PM
Subject: Re: [Heathkit] DX-40 Pwr Xfmr
 
Hi,

Late 80s I acquired a DX-35 and the power transformer was gone. No
tubes, either. I rewired it to serve as an amp for my QRP rig. At the
time I installed beefy power transformer that was capable of melting a
6146 without any strain at all (go ahead...ask).

I used that for several years and eventually disassembled it to send
real DX-35 parts to other hams. My present day solution to the power
supply problem is to build/use separate, external power supplies. Those
transmitters have that handy socket on the back already. In this case I
would build up an external power supply and feed that DX-40 from it. You
know what to do.

That DX-35 chassis has a socket on the rear for that power connection.
It was intended to supply power to something like an external VFO. Make
sure you plug the cable into that socket *BEFORE* you plug the other end
into the power supply and turn it on. You already knew that. Just a
reminder. You could change the socket to a plug for safety, a reversible
modification.

Having a few external power supplies makes the hobby cost less and makes
the radios more versatile. When we build something (you do build?) we
don't have to build yet another power supply. The radio is lighter. The
radio runs cooler. For mobile operation you can keep the mobile power
supply in the truck and AC mains operated supply under the home station
bench.

73,

Bill  KU8H

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