SB-102

[Allen Heibeck]

Hi Dwight et al,

The first three outs are just what you guessed, and was
included mainly for the plugging-in of a digital frequency display.

The 600 ohms is audio--the same audio as the speaker 8-ohm
out, except that it's at a 600-ohm impedance. This rear jack was
for the phone patch that was popular years ago. That same
600-ohm circuit is wired to the front-panel "(head)-phones" jack.

The 2000-ohm magnetic phones were common then, and the
600-ohms gave good volume level. Today's modern HiFi phones
are a very poor match and just don't work too well.
There is a very good mod (don't remember by who), that
shows how to very simply rewire the secondary of the output
transformer to provide 8-ohm impedance to the phones.
And-- all the guy's mods are totally reversable!

Allen,  KJ6XH


On Fri, 20 Feb 2004 19:42:57 -0500 "Dwight D. Smith, Sr."
<wb8jpj at ADELPHIA.NET> writes:
> Hi Green People,
>
>     I have a SB-102 that has for extra jacks wired to the rear
> panel.  They are labeled "L, H, B & 600 ohms"  I would assume that
> these are outputs from the LMO BFO, and Heterodyne oscillator, and I
> have no idea about the one labeled 600 Ohms.  I guess they could be
> inputs instead of outputs.  Anyone know what they may have been for?
>  I also have another SB-102 with a solid state LMO.  Can anyone
> supply any Info about this unit, when was it built, was it better
> than the tube unit Etc.
>
> Thanks in advance for your help.
>
> Dwight
>
> WB8JPJ
>
> Birthdays are good for you, the more you have the older you live to
> be!!
>
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