[Heathkit] Heathkit PS3 tube substitution

[Paul R. Hvidston]

Cal,

I'd be concerned about the max heater-to-cathode voltage of +/- 180 volts.
The later IP-32 had a separate 6.3 volt, 2 amp winding just for the 6L6's I
believe. Probably better off to add another 6.3 volt transformer that has
the insulation to handle the output voltage of the supply. Interesting idea
about the voltage doubler. 1619's were rated at 2.5 volt, 2 amp, while the
6L6 is 6.3 volt, 0.9 amps. Pretty close, but I wonder if you could get close
to 6.3 volts after diode loses. Might be worth a try. I've been looking for
a IP-32 or a PS-3 but have thus far been unlucky.

Regards,

Paul R. Hvidston, N6MGN
ACKSYS Engineering
Upland, CA

----- Original Message -----
From: "kwylow zinjanthropus" <catman351@yahoo.com>
To: <heathkit@mailman.qth.net>
Sent: Wednesday, August 14, 2002 1:57 PM
Subject: [Heathkit] Heathkit PS3 tube substitution


>
> All:
>
> First off, this is my first time on the Heathkit list. I'm glad to be here
as this is where I started out my "ham career", building at first, an HW-8,
then later an HW-101.
>
> My question surrounds the old PS3 power supply. It uses a pair of 1619's,
basically 2.5 volt filament 6L6's (if I'm not mistaken). I would like to
remove these tubes (when they are kaput) and slip in a set of 6L6's in their
place. My problem (at least on paper) is the changing out of the filaments.
I have two options:
>
> 1) Take off the 2.5vac winding from the sockets and use the current 6.3
VAC winding but their may be a problem: will that winding handle the extra
1.8 amp coming from the new 6L6's?
>
> 2) If the 6.3 VAC winding can't handle it, then maybe putting in a voltage
doubler on the 2.5 vac winding will do the trick.
>
> Any comments or suggestions will be indeed helpful to me in this quest.
Let me know and thanks.
>
> Cal, N6KYR.