SB-101 Factory Mod to Upgrade Receiver

[Stu Lyon]

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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