Thanks everyone. Indeed the nuvistors will be a challenge. Don't know if between the 2 recvrs I have enough or if they are good or bad... But if need be a bit o redesign may be in order. I am currently using a fair size copper tune loop/preamp on a tracor 599H. So thats a good start. But I will dig in and see whats cooking (Or not) Noticed one has the creeping ground lug oxidation. Time for a drill.
Regards On Sat, May 1, 2010 at 1:02 PM, J. Forster <[email protected]> wrote: > Have you tried Dave at Artek Media? > > A couple of things on the 117A: > > The antenna is a roughly 1 meter diameter loop, but has a very frequency > selective pre-amp built in. Early versions used two Nuvistors and a 60 KHz > mechanical filter. Later versions used FETs I think. The amp in the unit > also uses three Nuvistors. These devices are getting scarce and expensive. > > The coax between thr receiver and antenna has DC on it to power the loop > preamp. > > The paper for the stripchart is getting hard to find also. > > FWIW, > > -John > > ============== > > > > > > Just picked up 2 units at a flea market today. > > Would like to fire them up without smoke. :-) > > Would appreciate schematics if the are out there. > > My search so far is 0 > > Thanks > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
