Does the url suggest you may have searched for a H5901 rather than a H9501?
NTE seems to turn up these possibilities for a H9501.
Sent from someone's iPhone
> On Nov 23, 2022, at 12:04 PM, Antonio Carlini via cctalk
> On 21/11/2022 21:45, Antonio Carlini wrote:
>> I have two more I can open up and look at, but I cannot get to them tonight and
I'm probably out tomorrow too. But I think I can get to those other two supplies on
Wednesday. Hopefully at least one of them will be readable! Otherwise I can desolder the
diode from one of the other two and hopefully find a useful marking.
> Turns out I have three more PSUs ... and the diode markings are unfortunately
invisible on all but one. That one is this one:
> It's not really visible there either but with the PSU out and one end desoldered
I can see that it is marked H9501. I can also see that it doesn't conduct either way,
which might mean that this PSU is the non-working one I know I have. Obviously the
capacitor (820uF 250V electrolytic) is going to need replacing (might as well do both).
But first I need to remove them and see what (if anything has happened) underneath.
> This now goes back into my queue (behind the MicroVAXes and the H7868B PSU modules)
so if you fix yours before I get to mine, please let me know what you did :-)
> Antonio Carlini