[time-nuts] schematics for a HP117a please

[paul swed]

Uses 1 6cw4 at the integration amp and 3 X 7587s for the RF amps.
All 4 tubes filaments are series from the +35v which seems a bit high per
tube.
Buts thats the way its designed

On Sun, May 2, 2010 at 5:52 PM, J. Forster <jfor at quik.com> wrote:

> Hi Max,
>
> Take the top cover off. There is a shield box that may have useful info
> stenciled on top (2 - 4 screws) I have a HC manual, but cannot access it
> and won't be able to for some time.
>
> Best,
>
> -John
>
> =================
>
>
>
>
> > Well, I didn't get a manual with my receiver and I've never had it apart.
> > I
> > was just assuming that it used standard newvistors.  Assuming is always a
> > dangerous thing to do.
> >
> > Regards.
> >
> > Max.  K 4 O D S.
> >
> > Email: max at maxsmusicplace.com
> >
> > Transistor site http://www.funwithtransistors.net
> > Vacuum tube site: http://www.funwithtubes.net
> > Music site: http://www.maxsmusicplace.com
> >
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> >
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> >
> > ----- Original Message -----
> > From: "J. Forster" <jfor at quik.com>
> > To: "Discussion of precise time and frequency measurement"
> > <time-nuts at febo.com>
> > Sent: Sunday, May 02, 2010 2:52 PM
> > Subject: Re: [time-nuts] schematics for a HP117a please
> >
> >
> >> Hi Max,
> >>
> >> Are you sure the main unit uses 6CW4s? It's been 20+ years since I last
> >> had my unit apart, but I thought the 60 KHz amp in the main chassis used
> >> Nuvistors with either grid or plate caps, something I'd never seen
> >> before.
> >> I also remember the Nuvistors were numbered something like 7xxx.
> >>
> >> I don't have the manual to hand at the moment to check. Sorry.
> >>
> >> FWIW,
> >>
> >> -John
> >>
> >> ==================
> >>
> >>
> >>
> >>> http://www.tubesandmore.com/
> >>>
> >>> Has the 13CW4s for the loop antenna and 6CW4/6DS4s for the receiver.
> >>>
> >>> Regards.
> >>>
> >>> Max.  K 4 O D S.
> >>>
> >>> Email: max at maxsmusicplace.com
> >>>
> >>> Transistor site http://www.funwithtransistors.net
> >>> Vacuum tube site: http://www.funwithtubes.net
> >>> Music site: http://www.maxsmusicplace.com
> >>
> >>
> >>
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> >
> >
>
>
>
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