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Years ago there was a company that produced a regulating 1:1 or 2:1 transformer with

a ferro-resonant winding. hTeret had a capacitor across to hold the voltage steady. I don't

know the specifics of it's performance; and don't? remember the name of the company

nor the name of the product, but they were quite prevalent in industry and remember

them?being in demand by hams back then. It's probably been 30 or 40 years since hearing the

name.

John K0GCJ

On Mon, Oct 16, 2023 at 2:08?PM HaL Mandel <hmandel@...> wrote:

Gents, One of the bug-a-boos about QRO

tubism is the regulation and acceptability

of filament voltages.

?

Okay, tube manufacturers tell us “10%,”

and we have to live with whatever

Con Edison or Kentucky Power ends up

at our QTH to ply our signals out and about.

?

I know, I know Continental and all them

have Buck’n’boosters, automated

variacs on 3-phase mains: Just everything

money can buy.

?

So here’s Dave saying his filament voltage

droops a bit, and I’m sure there are others

out there, running 8877’s or CPX’s and

other thoriated devices, and what can we

as technicians offer them?

?

Would it not be fabulous for QST to publish in

its last edition this December, a sure-fire and

affordable means to conquer filament squirrels?

?

Let’s say Joe Ham has a wonderful $6K to $10K

linear running tubes that are in need of regulation.

Would it not be remiss to afford 10% more for a

regulation gizmo??

?

I know how much a good set of finals cost, and

frankly, I don’t know if I can ante up for a new

set if I pop the ones I got right now.?

?

So like owning a car that’s beginning to use a bit

more oil, I keep the drive down a bit on my inputs,

and just hope the beast can gently grow old like

the old man.

?

Hal

W4HBM