November 3, 1969



SB-110						Bulletin No:

Solid State Transceiver				SB-110-1



		              Audio Oscillation On CW



Problem:     	Audio Oscillation in Cw Mode with Sidetone Level

Control full on.

Symptoms:	Hand capacity affects near audio output state V6.  The large stand-up 20 ufd electrolytic capacitor C658, when moved, appears to have intermittent connection as well as

excessive heating of tube V6.

Cause:		B+ applied to VOX amplifier V4B, going through resistor	network of R49 [3.3 meg], sidetone level control

[500K], and R64 [3.3 meg] to grid of audio output amplifier V6B. 

This puts approximately +3 VDC on grid of V6B causing instabilityand 		excessive plate current flow of this stage.

Remedy:		Remove resistor R49 [3.3 meg] from receiver IF circuit board [PN 85-115] (See page 147, Fig. 3-2) and replace with a

500 pF disc ceramic capacitor [PN 21-13].



Change Notice and marked up Manual will be forwarded to Manual Department for insert so that future kit production will reflect above 

changes.



Thats everything I hold up to 1989 that covers the SB-110.  Enjoy!





73 de Joe  W7LPF/4  [NNN0KUU]

QWCA - SOWP - NCVA - FISTS - RCC Gordonsville, Va 22942 [Orange Co]