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
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