On Fri, Jan 24, 2020 at 01:12 AM, satbeginner wrote:
The 2465x uses what I call a "fly by wire" control system....
The sample and hold circuits are build using a simple opamp circuit.Thank you for pointing this out! This illuminates an entire section of the DAC "fly by wire" circuit that I have heretofore overlooked.
Certainly before I go to the monumental effort of performing a CRT swap, I will sniff my way carefully thought this MUX'd sample-and-hold circuitry.
I have ordered a CRT, which hopefully will be of the 2465A/B flavor, but I'd be nothing but glad to just put it up on a shelf or resell it instead of having to install it!
Also let me add my "+" to the massively informative, if not exasperatingly long and multilayered EEVBlog "2465B Teardown" thread. I spent hours pouring over that thread—hours well spent for anyone diving into a 2565B restoration. It was that thread that essentially illustrated the finer points of repairing the later model A5 board with its notorious leaky 'lytics.