Perry Glad the 117 found a home. That said don't be so quick to modify it. As an example the 3 nuvistors give an outstanding 120 db of gain. Hey if they work leave'em. Same goes for the dividers. But that said if something really is sick modify it. I would plan to if either of mine has a failure. I did have to replace one electrolytic. (White foamy stuff dead give away.) There is a lot of room for stuff inside and with todays technology it doesn't take much space. I also unplugged the strip chart recorder. I use an electronic program using a Dataq 4 cnl A>D converter $25. That way I can log four VLF rcvrs at a shot. And its quite. No tick tick tick. Regards Paul.
On Fri, Jul 26, 2013 at 12:57 PM, J. Forster <[email protected]> wrote: > IMO, it is unlikely you will be able to form the loop by hand on a > mandrel. I'd suggest a commercial conduit bender for that trade size > conduit and work your way along the tubing a few inches at a time. > > -John > > =============== > > > > > > > > > >  > > List, > >  > > I bought one of them for several reasons besides > > that I really wanted it. > >  > > 1. There is > > plenty of real estate to install Paul’s demod circuit. > >  > > 2. It is > > large enough so the nuvistors can be replaced with dual gate mosfets (I > > have > > lots of them). Also sometimes replacement nuvistors can be obtained on > > ebay for > > a reasonable amount. > >  > > 3. If > > needed, I believe most of the divider circuits can be relatively easily > > replaced with IC’s. > >  > > However the first thing I will do before firing it > > up (figuratively or literally) is to replace all the electrolytic caps. > >  > > I’m not interested in buying the antenna as there > > are numerous vlf antenna circuits with preamps for 60 KHz on the net. > > One suggestion I found interesting was the > > idea of filling your tubing with wet sand then using a truck tire to bend > > the > > loop. Where to borrow a truck tire? It didn’t say. > >  > > Regards, > >  > > Perrier > > > > > > ________________________________ > > _______________________________________________ > > 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.
