sb101,102,hw101.

[Bob And Bettina Groh]

Another way (mentioned I'm sure here) is to put a 6.3 or a 12 VAC
filament transformer in series with the ac line (the primary of the
filament transformer is wiring in parallel).  With the right phasing,
you get a very efficient 6 or 12 V decrease in the ac voltage going to
the rig's power supply. I used a 12 VAC wall wart wired up to an ac
outlet strip and it works great (the wall wart was rated at something
like 12 VAC at 2.5 A so I can pull up to 2.5A without beating it up too
bad (which is about 300W ac).

Bob, WA2CKY

James Montress wrote:

>This line of equipment was designed when AC line voltages were much lower
>than they are today. If you want a cooler running rig with no loss of 6ea8 and
>6au6 tubes due to leaks and shorts the solution is easy. In your HP-23 power
>supply install four (4) RS-271-131 one (1) ohm 10 watt resistors all in parallel
>in the 12.6 volt feed lead. This 0.25 ohms will bring your two filament strings
>down to mfgs specs of 6.3 vac. If there is any small imbalance left you may
>wish to hand pick your pilot lites. Good luck.
>
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