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

[Bob Camp]

HI

Grid current it is.

Bob

> On Nov 20, 2014, at 1:53 PM, AKLDGUY . <neilb0627 at gmail.com> wrote:
> 
> > …. 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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