(Apologies if I boff the thread reply!) Here¹s a link to a thread on eevb about my 735a, which includes pictures of the oven internals from another user.
http://www.eevblog.com/forum/testgear/hp-735a-dc-transfer-standard/ Funny you mention your friend in the early 70¹s-about that time, per the other poster in the above thread, the course cal was completely nixed and the discrete transistors were replaced with a 723 regulator. Maybe it was to fix the drift mentioned by your friend. My unit was manufactured in ¹68 so if that¹s the case, it should drift. I had intended to get some characterization of the 735a. Had it connected through my Datron 1062s until the one with ratio decided to crap out. For the 3 mos the setup was running, the 735a is rock solid-FWIW. Will get everything up and going again after boards. I¹ve wanted to do a side-by-side of the 731B and 735a. I¹ve been on the hunt for a 731B for a while-the ones that have popped up on eBay recently haven¹t inspired confidence. Shameless pitch-I have a very nice EDC 501J that I¹d be willing to trade 1:1 for a solid 731B, if anyone¹s interested. On 5/18/15, 11:00 AM, "[email protected]" <[email protected]> wrote: >Re: HP 735A DC Transfer Standard _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
