Re: hp5326a timer-counter

RoV wrote:
Hi all,

I have found an old hp5326a that I would like to repair because I like to restore old equipment.
Almost everything works apart input A. The problem seems to stay on the input board p/n 05327-60034, because even swapping the two boards connected to it to handle the triggering for A and B, the problem remains on A.
By comparing channels A and B, I see that in the working channel the trigger level pot changes a voltage on the connector going to the respective trigger board, while this doesn't happen on the other channel. The corresponding line goes to a metal can, 6 pin chip marked 5-334.
Unfortunately I couldn't find the schematic on the net (for free or at least cheaper respect to what I payed the instrument...). Neither I was able to find any info about the chip: I tried something like 1855-0344 but I later discovered that, in hp numbering, xxx5 is never used for ICs.

I wonder if someone can help...
(my real mail is on the web page)

Regards,
You had the right idea. The p/n is 1855-0334 (not 0344). It is not an IC, but rather a dual FET, hence the 6 pins. I think the manufacturer is Siliconix.
Unfortunately, I could not (easily) find a cross-reference, so I do not know much about it....but there are a couple dozen hits in Google....try that.
cv
.

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