560 is the original Corsair. 561 is the Corsair II.
Barry N1EU
On Sat, Jan 4, 2014 at 11:15 AM, Gary Smith <Gary@ka1j.com> wrote:
> Fellows,
>
> Thanks for the replies. I was looking over the manual with this
> radio, the replies here and some googling and noticed several things.
> This Corsair II is the 561 model but I see there also was a model
> 560. Looking at the TenTec wiki I found these pages:
>
> http://www.tentecwiki.org/doku.php?id=560
>
> http://www.tentecwiki.org/doku.php?id=561
>
> There is a whole lot more info listed on the 560 but mods are
> mentioned on the 561. I didn't realize there were two different
> Corsair II radios.
>
> The manual for this one is the 561 and I notice in surprisingly tiny
> handwriting a pencilled note with an asterisk on page 3-32 which I
> really don't remember doing but I obviously did. The page is the
> control board 80978 and the asterisk is next to Q15 and pencilled in
> says "As per TenTec OK. Q15 is changed from 2N6514 to MJE 3440 to
> permit 120V DC QSK switching". The info on this transistor is here:
> http://datasheet.in/img/html-pdf.gif
>
> Back in the day I would have had to have done this I was using a
> Heathkit SB-220 with QSK that utilized Richard Measures QSK circuit
> and I found that available on line:
> http://www.somis.org/HSS-diagram.jpg I sold that amp in 1996 and the
> Corsair II was mothballed while I lived in a basement apartment in
> Chicago for many years. I do believe I used this Corsair II with a
> Titan 425
>
> Readings at the QSK out at key down I read 42.3 ohms and .014V no
> reading when unkeyed.
>
> Perhaps the info about the transistor will help answer if this
> Corsair will work with the Alpha 77-D series amps. I'm reluctant to
> just connect the QSK out to the amp to see what happens though I
> can't envision any injury to either the amp or the Corsair.
>
> Thanks,
>
> Gary
> KA1J
>
>
>
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