[time-nuts] schematics for a HP117a please

J. Forster jfor at quik.com
Sun May 2 22:22:13 UTC 2010


OK. I'd forgotten about the integrator.

I've not looked at mine since about 1986 when I switched to LORAN. The
117A been switched off since. I've just been going for memory.

Enjoy,

-John

================


> 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
>> >
>> > To subscribe to the fun with transistors group send an email to.
>> > funwithtransistors-subscribe at yahoogroups.com
>> >
>> > To subscribe to the fun with tubes group send an email to,
>> > funwithtubes-subscribe at yahoogroups.com
>> >
>> > ----- 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
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> time-nuts mailing list -- time-nuts at febo.com
>> >> To unsubscribe, go to
>> >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> >> and follow the instructions there.
>> >>
>> >
>> >
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>





More information about the time-nuts mailing list