No, I didn't. I'm going to have to devote a fair amount of time to a
careful disassembly with copious notes and it's not something I can commit
to right now, so it's reassembled and back on the shelf for the time
being. I'm used to HP gear being a bit more user-serviceable, but I guess
they did
> -Original Message-
> From: Brent Hilpert
> Sent: 18 February 2022 06:30
> To: r...@jarratt.me.uk; General Discussion: On-Topic and Off-Topic Posts
>
> Subject: Re: Testing H745 Regulators
>
> On 2022-Feb-17, at 2:38 PM, Rob Jarratt wrote:
> >> -Original Message-
> >> From:
On 2022-Feb-17, at 2:38 PM, Rob Jarratt wrote:
>> -Original Message-
>> From: Brent Hilpert
>>
>> 20V on a 10 ohm load: current = 2A.
>> 15V, 1.5A.
>>
>> In this regulator design there is no path for more current than that which
>> the
>> load draws, aside from temporary peak currents
Thanks Jonathan,
In my case height doesn't matter.
Regarding the rating I am not clear what the rating of the original part is, I
haven't been able to find a datasheet for it, I have seen suggestions for both
20A and 35A, I do know that the H745 regulator is fed 20-30VAC from a
transformer.
From my (very stale) memory, FWIW
DEC Diagnostic file names were configured thus:
First Letter - machine they run on. ones I remember: Z=all Unibus,
V=LSI-11(18-bit), J=11/73(22-bit) etc. Strangely, I seem to remember
that C represented 11/45, but maybe they changed the scheme at one
On Thu, Feb 17, 2022 at 4:28 PM Chris Zach via cctalk
wrote:
>
> Hey all!
>
> While going through floppies I found these and was wondering what they
> were. Only clue in Google was someone asking in 1997 same thing.
>
> BL-T540B-M1 CZUFDB1 USER TESTS
> BL-T541B-M1 CZXD1B1 FIELD SERVICE TESTS 1
>
Hey all!
While going through floppies I found these and was wondering what they
were. Only clue in Google was someone asking in 1997 same thing.
BL-T540B-M1 CZUFDB1 USER TESTS
BL-T541B-M1 CZXD1B1 FIELD SERVICE TESTS 1
BL-T542B-MC CZXD2B0 FIELD SERVICE TESTS 2
BL-T565B-MC CZXD3B0 FIELD SERVICE
I used a Vishay GBPC3506W-E4/51, which is 600V 35A, 400A inrush rated. Looks
like they're currently on-order at Mouser, I don't know about other suppliers.
The GBPC3506W-E4/51 is a little thinner than the bridge rectifier DEC used
originally, which sometimes matters. For the 5411086 board in my
Hmmm this would suggest 200V 20A
https://archive.org/stream/bitsavers_decfieldSeeTechnicalManual1972_19126909
8/DEC_Field_Service_Technical_Manual_1972_djvu.txt rather than 35A. Given
the 20-30VAC input though, I presume a 50V part would be OK still?
> -Original Message-
> From: Rob
Sorry it has been a while responding. I have been looking further at my H745
regulators this evening. Below is what I have found and my responses to the
various questions.
In summary, it looks like the rectifier may be faulty. It is marked NSS3514.
I believe it is a 35A part. Can anyone suggest a
Hi Ben,
> I can't seem to find this anymore. I have seen a few mentions that there is
>a "wrapper" installer that is necessary to install 7.2 on an ES47/ES80
>>machine, and I'm hoping that it was archived or mirrored some place...
Back then in 2016, I also looked for these images for my
*The vintage Computer Federation will be having their 3rd swap meet.*
*Saturday, February 26, 2022*
*8AM to 2PM*
*ADDRESS*:
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