[Milsurplus] [ARC5] The Search for a Retubed, Stable BC-375 Oscillator

[AKLDGUY .]

> …. and regardless of the meter reading, don’t run it very long in that
condition.
> This is a “try it to see” thing, and not a “fiddle for a while” setup.

Sorry, but why the caution?
The B+ has been turned off or disconnected, so no damage can result from
lack of drive if that's what you mean. That's why I suggested removal of B+.

I could see your point if the grid current was grossly excessive which might
lead to grid damage, but in this case it's likely to be too low.

73 de Neil ZL1ANM


On Fri, Nov 21, 2014 at 1:34 AM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> …. and regardless of the meter reading, don’t run it very long in that
> condition. This is a “try it to see” thing, and not a “fiddle for a while”
> setup.
>
> Bob
>
> > On Nov 19, 2014, at 9:57 PM, AKLDGUY . <neilb0627 at gmail.com> wrote:
> >
> > On re-reading my own post, this paragraph doesn't convey what I meant:
> >
> >> Now turn off, do your mod. Run the filaments only if you can, or
> > disconnect
> >> the 1,000V plate supply to this tube. DO NOT key the BC-375 or transmit
> >> with it any way. Start your oscillator and check the meter reading. If
> > you get
> >> the same level of current or more, you have enough grid drive.
> >
> > Should read:
> >
> > Now turn off, do your mod. Run the filaments only if you can, or
> disconnect
> > the entire B+ to all transmit stages. Start your oscillator, key the
> > transmitter
> > or ensure the keying line is grounded, and check the meter reading. If
> you
> > get the same level of current or more, you have enough grid drive.
> >
> > Sorry 'bout that.
> >
> > 73 de Neil ZL1ANM
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