SB-847R TS-830S Low Voltage Supply Optional Improvements 7-29-81 Power supply drift and stability may be improved by these optional component changes and additions. On the AF AVR unit X49-1140-00 (Vicinity of Q27-Q30) change: R124 from 1K to 1.5K (RD14CB2E152J)* R127 from 470 to 390 (RD14CB2E391J)* R130 from 47K to 33K (RD14CB2E333J)# D25 from WZ-061 to XZ-053 (V11-4101-60)* *This will improve temperature drift from a maximum of about 100mV to a maximum of 1mV, and may be applied to any unit before serial # 201xxxx. Add two 22 k ohm 1/4 resistors (RD14CB2E223J0, one each across Q30, and Q34, collector to emitter.# #This will improve overall stability and may be applied to any unit before serial #105xxxx. Note: These changes are at the owners option and may not be performed in- warranty. JEB/sh (c) 041482TKC