[Heathkit] SB-610 phase networks needed

[Peter Markavage]

I didn't think the SB-610 one's were there, but figured you could get
some ideas on how to construct similar ones. Frequency is given and it
needs to do a 180 degree phase shift from plate to grid. But, if you're
not to concerned about the SB-610 phase shift frequencies, you can copy
the PEC's from the HO-10 which uses a similar 3 terminal device and
internal component configuration. All resistors are 470K and all
capacitors are 500 pf. The two frequencies in the HO-10 two tone
oscillator are 1000 and 1700 cycles. The ones in the SB-610 are 1500 and
1950. A side by side schematic, or at least of the two tone oscillator
section from both models, should get you up and running.

Pete, wa2cwa

On Fri, 21 Sep 2007 18:42:01 -0500 "K3PID" <k3pid at sbcglobal.net> writes:
> Close but no cigar Pete! The P.E.C. 84-39 & 84-40 are 3 terminal 
> devices while the 84 series in the catalog is a 4 terminal device. 
> The circuit shown in the SB-610 manual shows a 5 cap, 4 resistor 
> network but give no component values. I suspect that these were 
> "special order" OEM devices and were not included in the catalog.
> 
> Thanks
> Ron H. K3PID