Mike, the SZA263 and the LTFLU are Custom Specific circuits made exclusively for Fluke, and therefore the suppliers were not allowed to sell those freely on the market. The 332B used a similar reference assembly from TI, but including the necessary heater. I would also opt for replacement with a LM399 circuit, as the longterm stability (1 yr) and T.C. are definitely on a better level. Frank

On 4/9/2013 3:32 PM, Frank Stellmach wrote: > Mike, > > the SZA263 and the LTFLU are Custom Specific circuits made exclusively > for Fluke, and therefore the suppliers were not allowed to sell those > freely on the market. The 332B used a similar reference assembly from > TI, but including the necessary heater. > > I would also opt for replacement with a LM399 circuit, as the longterm > stability (1 yr) and T.C. are definitely on a better level. > > > Frank > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > Have you contacted Fluke directly? They maintain a supply of various parts for their instruments. . . . Randy, KI6WAS