WTB or Trade: SB-610 Vertical Amplifier Coils.

[Ed Richards]

Bill;

Just use any old 455 kc IF coil. Some old BC receiver maybe. Pick up 1 or
2 at your local thrift store for a couple of dollars. Cheaper if they
don't work. I used an IF coil from a parts GR-64. Peaked right up. more
than enough vert deflection. Don't install the 200 pf cap the manual
calls for as the IF coil is already resonant at 455 kc. I had to epoxy it
to the chassis as the mounting was a little different. Be sure to ground
the can if you do this. Good luck.

Ed Richards

On Sun, 14 Jan 2001 18:15:50 EST Bill    wa2adb <Wa2adb at AOL.COM> writes:
> Good Evening,
>
>        I have acquired an SB-610 Monitor Scope, that is currently
> tuned for
> the Heath IF, 3395 Khz.  I want to retune it to 455 Khz. IF.  I need
> the
> 40-746 Coil.  I have the 40-748 Coil and the 40-602 coil to trade.
> I will be
> glad to purchase the 40-746 coil if anyone has built this unit for
> the Heath
> IF and still has the extra coil.
>
>        An option is rewinding the 40-746 coil.  If anyone can
> provide me with
> the approximate number of turns required for 455 Khz I would go that
> route.
> My guess would be doubling the number of turns would reduce the
> frequency by
> about half, or 1600 KHz and doubling again would bring it to about
> 800 Khz.
> A bit less than doubling again should get pretty close.  Am I on the
> right
> track?  Would the maximum length of the coil be about the length of
> the slug?
>  Maybe I would need a longer slug with all those added turns.  Would
> a longer
> slug increase the total inductance?
>
>        I will appreciate all assistance offered, Thank You.
>
> Talk to you later,
>
>                                      Bill
>
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