Dale Wentz

From:	Stewart D Lyon [slyon@SPACEVECTOR.COM]

Sent:	Sunday, October 26, 1997 12:19 AM

To:	HEATH@LISTSERV.TEMPE.GOV

Subject:	Soup Up the SB301 for $7



Soup up your SB301 for $7.00 or less.

If you are thinking of replacing the tubes in your -301, the following may interest you. The tubes suggested will provide a theoretical open-loop gain increase of 3 to 3.5. I don't have the necessary test equipment to verify this but practically the receiver is much more sensitive with these tubes.

Position   Remarks  Type  Class       Gm   Price**

V1(RFamp)  Orig.    6BZ6  SemiRemote  8K   ---

Replacement 6GM6  SemiRemote  13K  $3.00

V6(1stIF)  Orig     6BA6  Remote      4.3K  ---

        Replacement 6AH6  Sharp       9K    $2.50

            or      6HR6  SemiRemote  8.5K  $4.00



Notes: Retune rf coils and T3 after replacement.

6AH6 provides smoother AGC action but tends to overload when used as a monitor of local CW xmtr.  Do not change V7 type - circuit may oscillate!

BTW - The 6HR6 is a suitable replacement for the SB101 RFamp(V10) for the 6AU6 or 6HS6.

**Prices are from Vacuum Tubes Unlimited at

http://www.cinternet.net/~vactubes/index.html

73,  Stu-W6CUX



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