IBM 4331 Mainframe

Guy Sotomayor Jr ggs at
Mon May 1 11:57:07 CDT 2017

> On May 1, 2017, at 9:53 AM, dwight via cctalk <cctalk at> wrote:
> Aren't these water cooled?
> I seem to remember hoses.

No this is all air cooled.

TTFN - Guy
> ________________________________
> From: cctalk <cctalk-bounces at> on behalf of Dave Wade G4UGM via cctalk <cctalk at>
> Sent: Monday, May 1, 2017 9:48:52 AM
> To: 'Guy Sotomayor Jr'; 'General Discussion: On-Topic and Off-Topic Posts'
> Subject: RE: IBM 4331 Mainframe
>> -----Original Message-----
>> From: cctalk [mailto:cctalk-bounces at] On Behalf Of Guy
>> Sotomayor Jr via cctalk
>> Sent: 01 May 2017 05:39
>> To: General Discussion: On-Topic and Off-Topic Posts
>> <cctalk at>
>> Subject: IBM 4331 Mainframe
>> Just to let folks know that I finally moved the IBM 4331 Mainframe this past
>> weekend from where it was currently stored to my shop.  Pictures are here:
>> <>
>> As can be seen in the pictures, it filled a 26’ box truck that I had rented for
>> this purpose.
>> Right now I just have it placed somewhat in my shop.  Some early tasks will
>> be:
>>   * I have to verify that I have everything.  Even if I missed some items, they
>> won’t be
>>     scrapped.  I just need to go over what is currently in my shop and verify
>> that I didn’t
>>     leave anything behind.  I’m mostly worried about cables at this point.
>>  * I have to figure out some way to produce enough “clean” 3-phase power
>> to run the
>>    peripherals (the CPU is 220v single phase) as I only have 220v single phase
>> coming
>>    into my shop.
>> Starting to power it up will probably be a while yet.  ;-)
> Yes I remember having a gentle discussion with the University of Salford electricians, who wanted to know why I wanted 2 x 100amp feeds for the room into which the 4361 (I think it was a 4361, might have been a 4331 or 4341) was placed. I don't think we ever loaded them at 100amps but that was what IBM required. One was for the AirCon and the other for the CPU. If I remember properly those disks are the truculent ones. Assuming you have AirCon they need to sit for several hours to acclimatise.
>> TTFN - Guy
> Dave

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