[NJARC] Radio Debugging PS

[Scott Roberts]

Think I'll hook up the speaker & antenna- see how it works before
cosing up for the weekend(see previous posting)!

:) Thanks Al!

And I don't worry too much about the "ideal" being "ideal" I just
meant that phrase as the numbers being closer to what they're
telling me they want.. I know 70 years will make some changes...
:)

Scott

--- Al Klase <al at ar88.net> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> See below.
> 
> Scott Roberts wrote:
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > John(and Al)
> >
> > I made the changes, and it -did- pull the numbers a bit
> closer to
> > "factory ideal", 
> Get that "ideal" stuff out of your head.  It will make you
> crazy.  If a 
> plate is suppose to be 270 volts and your meter says 6, there's
> a 
> problem.  (Like an open plate load.)  If a screen grid is
> suppose to be 
> 100 volts, and the meter says 50, the screen resistor is most
> likely 
> cooked high. ETC ETC  - READ THE SCHEMATIC!
> 
> > although my 5 pins are still high- actually got
> > higher with the changes... 
> READ THE SCHEMATIC!  Pins 5 and 8. cathode and supressor grid,
> are wired 
> together on all three 6K7's.  In spite of this the stupid
> voltage chart 
> claims different voltages!  Impossible.  Use the pin-8 values. 
> Charts 
> like this are just a guide.  HOW DOES THE RADIO WORK?
> > And the beat osc. 6J7, is showing 8.75
> > on 3&4(should be 150, each) and 165 on pin 6(should be 350).
> > Also, I have a -32 on pin 5 of either 67 Mixer or 6J5G Osc.(I
> > have to recheck- it is showing on one in the first check, the
> > other on the second, so I may have written in the wrong
> box...)
> >   
> Pins 3 and 4, the screen grid and plate, are low because the
> BFO is not 
> turned on, SW 2.  READ THE SCHEMATIC!  tell us which tube
> elements are 
> involved, so we don't have to look them up.  If the switch is
> on, turn 
> the set off and ohm the circuit and find out why there's no
> voltage.  
> READ THE SCHEMATIC!
> 
> HOW DOES THE RADIO WORK?  do you get a beat not when tuned to a
> station 
> and you turn on the BFO?
> > I am going to retest the tubes before I proceed further. 
> > Still trying to figure why the Beat Osc numbers are so low.
> They
> > are the same with BFO on or off, and with RF at high.
> >
> > Oh- and I think that "motorboating like noise" came from the
> > meter! I noticed it coming form that area when I switched the
> RF
> > gain to full. I think it may have been out of adjustment: the
> > needle went full left. So I turned the adjuster just a little
> to
> > bring it back up to zero
> >
> > As to VTVMs, I have several- now I have to remember which one
> > WORKS! 
> >   
> I'd continue using the DVM.  It should be more reliable.
> 
> -- 
> Al Klase - N3FRQ 
> Flemington, NJ 
> http://www.skywaves.ar88.net/
> 
> _______________________________________________
> NJARC mailing list
> NJARC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/njarc
> 



      ____________________________________________________________________________________
Never miss a thing.  Make Yahoo your home page. 
http://www.yahoo.com/r/hs