[NJARC] Re: Philco 70 Question Re: AC/DC & More

[radiomf at comcast.net]

2nd attempt to reply...
Going from memory here, this is the detector coil and is connected to the plate  (B+) of a tube. The celluloid is not needed to insulate as the coil form itself is non-conductive.
Marty
-------------- Original message -------------- 
From: John Ruccolo <jr6v6gt at yahoo.com> 

> Visit our web site - See http://www.njarc.org 
> _______________________________________________ 
> Hi Lisa, 
> 
> There should be *no* B+ there, if this is the RF input 
> coupling coil. Or are we talking about something else? 
> 
> Just my two cents, 
> 
> JR 
> 
> PS -- Marty, I really enjoyed your Philco 70 diary. It 
> was terrific! 
> 
> --- radiomf at comcast.net wrote: 
> 
> > Visit our web site - See http://www.njarc.org 
> > _______________________________________________ 
> > 
> > That was celluloid. It probably was used in the 
> > original manufacture and can be discarded. I would 
> > not use paper, but maybe some wide scotch tape. but 
> > that would be slippery and make winding more 
> > difficult.either leave it be, or remove it and not 
> > replace it. 
> > -------------- Original message -------------- 
> > From: 
> > 
> > > Ok - coupling...resonant secondary - that all 
> > makes sense. Thanks! 
> > > 
> > > Yes, 64 turns looks about right - I stopped 
> > counting at 50!! So, that makes 
> > > 20.1' of wire plus several inches for the leads. 
> > Lots of wire in such a tiny 
> > > space. 
> > > 
> > > Here's my next challenge: The plastic insulating 
> > shield between the coils is 
> > > yellowed and badly split (probably contributed to 
> > the open circuit). I want to 
> > > cut a strip of heavy paper to replace it (plain 
> > notepad). How does paper stand 
> > > up to 250V of B+ ? Should I be considering a 
> > different material? 
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> 
> 
> 
> 
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