The LM208 is a single op-amp with low offset (<3mV) and low bias current. The NTE928 is a dual op-amp with <7mV offset. You may be able to live with the offset at the cost of degraded performance but the pin-out is not compatible.
Look for a single op-amp with very low offset. I am not near a computer right now but there must be a ton of those at Digikey. Didier KO4BB On Wed, Sep 11, 2019, 9:21 AM Club Internet <[email protected]> wrote: > Luciano, > References of the manual is the following: > MANUAL PART NUMBER 10811-90002 Microfiche Part Number 10811-90003 > Dated August 1980. > > Thanks very much for your reply (indeed npn and Q6...!) > Looking for a replacement for UA208 (obsolete) hard to find, as well as > LM208 => would NTE928 or ECG928 be ok ? > > Best, > Gilles. > > Envoyé de mon iPad > > > Le 10 sept. 2019 à 20:29, "[email protected]" <[email protected]> a écrit > : > > > > > > Gilles, > > > > what manual you refer? (Part number) > > > > Heating transistor are NPN.TO220 similar to TIP120 > > > > Driver is Q6 and NPN similar to 2N3904 > > > > U1 is LM2904N > > > > U3 is uA208M > > > > Luciano > > > > > > Da "time-nuts" [email protected] > > A [email protected] > > Cc > > Data Tue, 10 Sep 2019 17:54:17 +0200 > > Oggetto [time-nuts] Hp10811 parts ref > > Dear list, > > Looking forward to apply the oven configuration of the 10811 oven > oscillator - that is working so well - could you please help me identifying > the appropriate references for the active parts : > > Q7 and Q8 heating darligntons PNP > > Q4 driving transistor PNP > > U1 and U3 op amps > > From the schematic on fig 8-15 on page 64 of the HP manual. > > > > Thx very much, > > Gilles. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
