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HP410C late version

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factory:
You would need to find an EA53 tube & spring to use that probe, some 410B probes only fit one type of tube too.
The EA53 has a 6.3V heater, 2-01C has a 5V heater, the 410C has no adjustment for this.

If the 410C was mine I would look for the correct probe and save that NOS probe for a 410B, both types of VTVM in good working order are quite pricy these days.

Did you compare component date codes with the A3 board & the rest of the 410C, to determine if it is original, or a repair replacement due to failed neon photo chopper assembly?
It isn't clear from the two manuals in the Keysight (Agilent) pdf, at which serial number the change was made, note the A3 tube heater was fed from the +6V dc supply.
I do have pictures of one with the optical chopper board, that otherwise looks the same as yours, but the serial number plate had been removed, quite strange as it looked in almost new condition.

David

Ovi4:
@Factory,  I had a closer look at the modules and found the following :

1.  the A3 module is made by HP (so original) has 00410-66502 REV D  is identical with the one presented in the manual
2.  the A6 module is made by HP (so original) has 410-65B  REV C  is again identical with the one presented in the manual
 
Both boards appear to have the factory components on them and the right component values (precisely) as the manual states

Even the PSU part appears to be untouched since it still has the original filtering capacitors, Original diode bridge rectifier and the Power transformer as well

Now the bad part:  I couldn't say the same for the TRS Jack (socket)  that has been exchanged for an ordinary BNC connector with a bit of white coax cable soldered to it. Now the person who did this mod was nice enough simply leave the original jack wiring alone and just had the ends insulated with some light gray electrical tape.  wiring colors are white, black and gray.  See pictures attached. Now I'm still to follow each wire and bell them out to see if they're really for that AC probe's jack.

Now regarding the AC probe you are right, it is wise to leave the HP410B probe (2-01C tube) that I have alone and search to an original HP410C probe (EA 52 tube)
Well, at the moment there aren't any for sale on E-Bay other than the ones sold via E-Bay by the kiss-electronics.com but quite pricey !!!!
Now, I wonder where am I suppose to find one to buy here over the net since where I live there isn't such thing as swap-meets or anything like that.
Perhaps one of the people here on this forum might have something like that  for sale.
Any clues or perhaps links are highly appreciated.
Thank you all.

Renaud F5ZR:
Hi,
I just bought an HP410C too but unlike yours it is the vacuum kind.
It's probably an early model as the mains plug is not IEC but one I didn't know.
SN is also unusual I think:
G605-01163
The G (hence german made) beeing first not in the middle in HP fashion. 1966?
I'm also looking for the EA53 probe I don' have.
Renaud

factory:
605 is not the date of manufacture, it's the date of the last design revision, in this case the design revision is week 5 of 1966.
The 410C was available with or without the AC probe, hence why many don't have one with them.

David

trackersoft:
Ashley at Kiss Electronics http://www.kiss-electronics.com/index.htm is a great resource for parts and service.

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