SB-848 TS-530S Low Voltage Supply Optional Improvements 7-30-81 Power supply drift and stability may be improved by these optional component changes and additions. On the AF AVR unit X49-1150-00 (Vicinity of Q19,Q20) change: R68 from 1K to 1.5K (RD14CB2E152J)* R72 from 470 to 390 (RD14CB2E391J)* D14 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 Q19, and Q20, collector to emitter.# #This will improve overall stability and may be applied to any unit before serial #201xxxx. Note: These changes are at the owners option and may not be performed in- warranty. JEB/sh (c) 041482TKC