SB-101 Factory Mod to Upgrade Receiver

[Ed Gardner]

Anyone know if this mod will work on the SB-301? Its got 6AU6's in the
first and second mixers.

Ed

Stu Lyon wrote:
>
> Mark,
> That's the mod. Just plug the 6HS6 in. If you compare the -101 and -102
> schematics, you'll find they are identical in that area. The other stuff had
> to do with switching small capacitors across the two driver variables on
> receive to account for the difference in "Miller effect" on transmit vs.
> receive.
>
> On my SB-101, I also replaced V11 (1st Rx mixer) and V3 (1st IF) with 6HS6s.
> These two were also just plug-ins. Really makes the set hot.
>
> 73, Stu W6CUX
> Winnetka, CA
> ARRL Life Member
>
> ----- Original Message -----
> From: "Mark Johnson/Ontario/IBM" <mjohnson at CA.IBM.COM>
> To: <HEATH at LISTSERV.TEMPE.GOV>
> Sent: Thursday, September 14, 2000 4:25 AM
> Subject: SB-101 Factory Mod to Upgrade Receiver
>
> > Hello Heath Team;
> >
> > I just bought an SB-101 that I'm bringing back to life. It has a 6HS6 RF
> > amp tube which in theory means it has the upgraded receiver mod. According
> > to the C. Penson book, that mode consists of changing the tube from a 6AU6
> > to the 6HS6, and a disc cap is removed from the component side  of the
> > board (can't recall the board name) between V10, and V11. Then a different
> > capacitor and resisitor are "tacked" into place.
> >
> > My rig has a 6HS6, but no sign of a removed disc cap or a cap and resistor
> > "tacked" back into place.
> >
> > My question: Can anyone give me the mod details so I can complete what I
> > think is an incomplete mod upgrade. I suspect one of the rigs owners, at
> > some point, just put the 6HS6 in and did not complete the mod.
> >
> > Oh, also need a new main tuning knob for the rig...The one on here looks
> > like it survived WWI trench warfare. Anyone assist me with that??
> > Thanks Team!
> >
> > Mark V. Johnson
> > VE3DJU
>
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--
Edward Gardner
KC2BYA, FISTS #6940
NNN0BDP NAVMARCORPMARS
------------------------------------------------
We have no government armed with power capable of
contending with human passions unbridled by morality
and religion. Avarice, ambition, revenge, or gallantry,
would break the strongest cords of our Constitution as
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only for a moral and religious people.  It is wholly inadequate
to the government of any other.

                        - John Adams, Oct.11, 1798
                          Address to the military

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