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Copy/paste didn't work. HP 1821 has almost the same circuit. Ozan ===

HP has almost the same exact circuit with -8.5V in one state (lamp is on) and -11.4V (lamp is off) in another state. Looking at 1421 schematic, few voltages look like typos. Ozan

That's what I kept thinking - especially since everything else that's connected to the base is negative. Could that be a typo? Barry - N4BUQ

-8.8V seems much more plausible, with the emitter -9.4V Hugh Gilbert

If you have the meter and desire the original detailed service manual complete with fold out schematics error correction graphs, theory of operation... Please PM direct. Serials prefixed 416--- xxx hp

Chuck, Thank you so much for that. I couldn't tell if that was a + or a - in front of the base voltage but that shows it clearly as +. Thanks again, Barry - N4BUQ

Yes, there is a process to have "downloadable programs" sent to the 8595E.? I do need to get the program though!

Here's a clean scan of the section you are looking at. ChuckA -- See Early TV at: www.myvintagetv.com

Does anyone have a readable schematic for the A101 board in a 1421A? I have a paper manual on order but until that arrives, I would appreciate finding out the voltages shown for Q109 (Page 5-16,

Is it possible that the unit is late enough that its using a 0 offset opamp and wouldn't need that pot? I did look at the online schematic and do see what your talking about. But maybe they were not

Hi The HP 8595A have a card reader at front,and need hardware option 119 when used with NF personality DLP. Hardy Fra: [email protected] <[email protected]>

Hi You are correct-this analyzer must have hardware option 119(noise fgure) for use with 85719A.Its not difficult to transfer this program via gpib. Regarding the expensive ram cards used for this

Thank for the info. I have sent off an email to Carleton University but also still searching. :) Jared

Sorry .. finger trouble ..? I meant to write 95E.

After having a bit of a search online etc, I have found that Keysight list the 1820-2149 as being replaced by 5088-7082 (both are obsolete), so that opens up the search parameters a bit maybe. Jared

As always, an absolutely beautiful document, for the mind and the eyes. Thanks!

I'm pretty certain the analyser will use the Y factor method (not the gain method) so an external noise source (HP 346B?) and an external preamp is needed (HP 87405A would be good here as it can be

EDIT: The latest manual I've found is 00427-90005. ?I saw?00427-90008 referenced in a comment on a web page but haven't found it anywhere. Leon...

Hello, I recently acquired a Govt. Surplus (Air Force) HP 427A, SN/ 947-A19375. ?I was going to adjust the DC offset according to section 5-30 of the manual but the A2 board doesn't have the A2R7 pot

Have a new box unopened, 50 sheets 81/2 x 11 plotter film. Contact me via PM if interested.