Re: Re: Rack-mounting a TU56

[Mattis Lind via cctalk]

2017-05-27 18:32 GMT+02:00 william degnan :

> What is the rating on the caps?
>

100uF 55VAC

Davids page on TU56 capacitors:

https://www.pdp8.net/tu56/pics/motor_caps.shtml?small

The DAL-2EJ100 does not seem to exist any more. The same company have this:
 CBB65-370R107

What are people buying to replace those capacitors?

/Mattis



> Bill Degnan
> twitter: billdeg
> vintagecomputer.net
> On May 27, 2017 12:20 PM, "Mattis Lind via cctalk" 
> wrote:
>
>> I have just looked into my two TU56 and all caps are leaking more or less.
>> I need eight new capacitors.
>>
>> What happened to this group buy of capacitors?
>>
>> /Mattis
>>
>> 2017-03-06 19:23 GMT+01:00 Gerhard Kreuzer via cctalk <
>> cctalk@classiccmp.org
>> >:
>>
>> > Hi,
>> >
>> > will join a group buy, need caps for 2 drives ..
>> >
>> > With best regards
>> >
>> > Gerhard
>> >
>> > -Ursprüngliche Nachricht-
>> > Von: cctalk [mailto:cctalk-boun...@classiccmp.org] Im Auftrag von
>> > cctalk-requ...@classiccmp.org
>> > Gesendet: Montag, 06. März 2017 19:00
>> > An: cctalk@classiccmp.org
>> > Betreff: cctalk Digest, Vol 33, Issue 6
>> >
>> > Send cctalk mailing list submissions to
>> > cctalk@classiccmp.org
>> >
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>> >
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>> > "Re: Contents of cctalk digest..."
>> >
>> >
>>
>

Re: Re: Rack-mounting a TU56

[william degnan via cctalk]

What is the rating on the caps?

Bill Degnan
twitter: billdeg
vintagecomputer.net
On May 27, 2017 12:20 PM, "Mattis Lind via cctalk" 
wrote:

> I have just looked into my two TU56 and all caps are leaking more or less.
> I need eight new capacitors.
>
> What happened to this group buy of capacitors?
>
> /Mattis
>
> 2017-03-06 19:23 GMT+01:00 Gerhard Kreuzer via cctalk <
> cctalk@classiccmp.org
> >:
>
> > Hi,
> >
> > will join a group buy, need caps for 2 drives ..
> >
> > With best regards
> >
> > Gerhard
> >
> > -Ursprüngliche Nachricht-
> > Von: cctalk [mailto:cctalk-boun...@classiccmp.org] Im Auftrag von
> > cctalk-requ...@classiccmp.org
> > Gesendet: Montag, 06. März 2017 19:00
> > An: cctalk@classiccmp.org
> > Betreff: cctalk Digest, Vol 33, Issue 6
> >
> > Send cctalk mailing list submissions to
> > cctalk@classiccmp.org
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://www.classiccmp.org/mailman/listinfo/cctalk
> > or, via email, send a message with subject or body 'help' to
> > cctalk-requ...@classiccmp.org
> >
> > You can reach the person managing the list at
> > cctalk-ow...@classiccmp.org
> >
> > When replying, please edit your Subject line so it is more specific than
> > "Re: Contents of cctalk digest..."
> >
> >
>

Re: Re: Rack-mounting a TU56

[Mattis Lind via cctalk]

I have just looked into my two TU56 and all caps are leaking more or less.
I need eight new capacitors.

What happened to this group buy of capacitors?

/Mattis

2017-03-06 19:23 GMT+01:00 Gerhard Kreuzer via cctalk :

> Hi,
>
> will join a group buy, need caps for 2 drives ..
>
> With best regards
>
> Gerhard
>
> -Ursprüngliche Nachricht-
> Von: cctalk [mailto:cctalk-boun...@classiccmp.org] Im Auftrag von
> cctalk-requ...@classiccmp.org
> Gesendet: Montag, 06. März 2017 19:00
> An: cctalk@classiccmp.org
> Betreff: cctalk Digest, Vol 33, Issue 6
>
> Send cctalk mailing list submissions to
> cctalk@classiccmp.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://www.classiccmp.org/mailman/listinfo/cctalk
> or, via email, send a message with subject or body 'help' to
> cctalk-requ...@classiccmp.org
>
> You can reach the person managing the list at
> cctalk-ow...@classiccmp.org
>
> When replying, please edit your Subject line so it is more specific than
> "Re: Contents of cctalk digest..."
>
>

AW: Re: Rack-mounting a TU56

[Gerhard Kreuzer via cctalk]

Hi,

will join a group buy, need caps for 2 drives ..

With best regards

Gerhard

-Ursprüngliche Nachricht-
Von: cctalk [mailto:cctalk-boun...@classiccmp.org] Im Auftrag von
cctalk-requ...@classiccmp.org
Gesendet: Montag, 06. März 2017 19:00
An: cctalk@classiccmp.org
Betreff: cctalk Digest, Vol 33, Issue 6

Send cctalk mailing list submissions to
cctalk@classiccmp.org

To subscribe or unsubscribe via the World Wide Web, visit
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When replying, please edit your Subject line so it is more specific than
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Re: Rack-mounting a TU56

[Jay Jaeger via cctalk]

> 
> Speaking of which - I'll put out a call again for if anyone wants to get a 
> group purchase on the motor run caps for a TU55/56
> 

I need some.  I have been working on my system, and just discovered that
all four of my drives have leaking motor run capacitors.

I have found some online, but they are a bit too tall (probably
workable), and specified as 1/4" too large a diameter.

Four drives x 4 caps each == 16.

JRJ

AW: Re: Rack-mounting a TU56 (Jay West)

[Gerhard Kreuzer]

Yes please

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cctalk-requ...@classiccmp.org
Gesendet: Sonntag, 18. Dezember 2016 19:00
An: cctalk@classiccmp.org
Betreff: cctalk Digest, Vol 30, Issue 18

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To subscribe or unsubscribe via the World Wide Web, visit
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RE: TU56 Run Capacitors (was Rack-mounting a TU56)

[Robert Adamson]

> Jay wrote:
> Speaking of which - I'll put out a call again for if anyone wants to
> get a group purchase on the motor run caps for a TU55/56
> 

I'd be interested in a couple. I could only find some oversized stud-mounted
ones when I refurbed my TU56 and although they're perfectly functional they
don't look too good.

Re: Rack-mounting a TU56 (Jay West)

[Michael Thompson]

>
> Date: Fri, 16 Dec 2016 13:12:45 -0600
> From: "Jay West" <jw...@classiccmp.org>
> Subject: RE: Rack-mounting a TU56
>
> Speaking of which - I'll put out a call again for if anyone wants to get a
> group purchase on the motor run caps for a TU55/56
>
> J
>

Yes please.


-- 
Michael Thompson

RE: Rack-mounting a TU56

[Paul Birkel]

-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Henk Gooijen
Sent: Friday, December 16, 2016 3:03 PM
To: cctalk@classiccmp.org
Subject: RE: Rack-mounting a TU56

Van: Ethan Dicks<mailto:ethan.di...@gmail.com>
Verzonden: vrijdag 16 december 2016 20:43
Aan: General Discussion: On-Topic and Off-Topic 
Posts<mailto:cctalk@classiccmp.org>
Onderwerp: Re: Rack-mounting a TU56

On Fri, Dec 16, 2016 at 2:12 PM, Jay West <jw...@classiccmp.org> wrote:
> Speaking of which - I'll put out a call again for if anyone wants to get a 
> group purchase on the motor run caps for a TU55/56

I need a few.

-ethan

-
I have one TU56. There will come a day that I am up to connect it …
Until then I don’t know in what shape the run caps are, so I probably
do wise to join in this group buy opportunity – depending the cost 


  *   Henk, PA8PDP

-
Same situation and perspective as Henk, here.

I guess that means that you can mark us both as "tentative" :->.

paul

Re: Rack-mounting a TU56

[E. Groenenberg]

On Fri, December 16, 2016 20:30, Marc Howard wrote:
> I replaced my motor caps with some that I found on Alibaba (or maybe
> Aliexpress) a couple of years ago.  They are the right diameter and height
> and have wire leads instead of lugs. They're also made with yummy
> vegatable
> oil and seem to work just fine (no big loud bangs yet).
>
> Marc
>
> On Fri, Dec 16, 2016 at 11:15 AM, jos  wrote:
>
>>
>> Speaking of which - I'll put out a call again for if anyone wants to get
>> a
>>> group purchase on the motor run caps for a TU55/56
>>>
>>
>> Count me in
>>
>> Jos
>>
>

Ah, these white ones. Got 4 of them for my TU-56. Pretty cheap, I believe
I paid about 4 USD/each including free shipping, got them off ebay.

'vegetable oil' indeed..


Ed
--
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BTC : 1J5fajt8ptyZ2V1YURj3YJZhe5j3fJVSHN
LTC : LP2WuEmYPbpWUBqMFGJfdm7pdHEW7fKvDz

RE: Rack-mounting a TU56

[Jay West]

I had written
> Being a stickler for authenticity, I was looking for that support bracket but 
> never did find one.
> So... I wound up using one of those horizontal bars/plates that were 
> commonly (DEC provided) mounted above and below a stack of lead 
> counterweights, as it's mechanically almost identical and provides 
> exactly the same benefit in the same spot. I left it installed, in case I 
> ever wanted to move the TU56.

To which Tony replied
-
I am not sure what parts you are talking about here, or why.
-

I am talking about a fairly common dec part, that if you have it - can 
substitute for the support bracket that you are missing. It is the same 
dimensions, is threaded at the same spots... the only difference was the 
support bracket has some metal cutouts that the "alternate" part doesn't.

If you have a DEC rack (I know DEC did this in H967's and may have done it in 
H960's) that has lead counterweights in the back you will note that the 
plates bolted in the rack under the lead weights (and usually another plate on 
top of them just to make it look nice)  that plate is basically identical 
to the TU-56 support bracket you are seeking and will work functionally - 
exactly like the support bracket.

J

RE: Rack-mounting a TU56

[Henk Gooijen]

Van: Jay West<mailto:jw...@classiccmp.org>
Verzonden: vrijdag 16 december 2016 21:05
Aan: 'General Discussion: On-Topic and Off-Topic 
Posts'<mailto:cctalk@classiccmp.org>
Onderwerp: RE: Rack-mounting a TU56

Ok I just double-checked my 8E racks, and it refreshed my memory.

The support bracket is not necessary. I believe that it provided no benefit 
after the TU56 was mounted... it was merely present in order to make it even 
possible for one person to bolt the tu56 to the uprights. It is a non-trivial 
amount of weight, so holding it in place while bolting it in is tenuous at the 
least and most likely impossible. The support bracket just provides a front 
edge to help hold it up during installation.

But given the weight, I'd not try it "just to see" ;) YMMV



That is my experience too.
But I did that mounting job in the rack back when I was 15 years
younger. Age does not help in this case.
It can be done by one person, but indeed – it is not non-trivial!

If you start with an empty rack, and the TU56 is the first device you
want to install in the rack, you can lay down the rack on the floor
and then “drop” the drive into the rack. Bolting it in place with the
4 screws at each side is “piece of cake”.
I used this “procedure” also to mount two RK05 drive in the top of an
H960 rack. Getting the rack upright with the two RK05’s was another
story … The more a rack is filled (in the lower part), the heavier tilting
and laying down will become, but it is possible.


  *   Henk, PA8PDP

Re: Rack-mounting a TU56

[Ethan Dicks]

On Fri, Dec 16, 2016 at 3:05 PM, Jay West  wrote:
> Ok I just double-checked my 8E racks, and it refreshed my memory.
>
> The support bracket is not necessary...
>
> All this occurred in the short version of the H960 (I forget... H962? The one 
> with the sloped front).

H967

http://web.aanet.com.au/~malikoff/pdp11/DEC_cabinets.jpg

> The sloped front at the top was just the tiniest fraction too far out to 
> allow the TU56 deck to tilt down - despite the fact that DEC obviously took 
> pains to make it require no clearance overhead.

That is exactly what I was just wondering.  Thanks!

-ethan

Re: Rack-mounting a TU56

[Marc Howard]

I replaced my motor caps with some that I found on Alibaba (or maybe
Aliexpress) a couple of years ago.  They are the right diameter and height
and have wire leads instead of lugs. They're also made with yummy vegatable
oil and seem to work just fine (no big loud bangs yet).

Marc

On Fri, Dec 16, 2016 at 11:15 AM, jos  wrote:

>
> Speaking of which - I'll put out a call again for if anyone wants to get a
>> group purchase on the motor run caps for a TU55/56
>>
>
> Count me in
>
> Jos
>

Re: Rack-mounting a TU56

[Pontus Pihlgren]

On Fri, Dec 16, 2016 at 01:12:45PM -0600, Jay West wrote:
> 
> Speaking of which - I'll put out a call again for if anyone wants to get 
> a group purchase on the motor run caps for a TU55/56
> 

Are these the big honking cans that have grown a nice little crystal 
structure near one connector?

yeah, I thunk I need a pair for mu TU56H

If me being in sweden makes it to much hassle then I'm I'll try to get them 
myself, no worries.

/P

Re: Rack-mounting a TU56

[Tony Duell]

On Fri, Dec 16, 2016 at 8:05 PM, Jay West  wrote:
> Ok I just double-checked my 8E racks, and it refreshed my memory.
>
> The support bracket is not necessary. I believe that it provided no benefit 
> after the TU56
> was mounted... it was merely present in order to make it even possible for 
> one person
> to bolt the tu56 to the uprights. It is a non-trivial amount of weight, so 
> holding it in place
> while bolting it in is tenuous at the least and most likely impossible. The 
> support bracket
> just provides a front edge to help hold it up during installation.

OK. Sounds like I can live without it. I had considered making a rail
with tapped holes
in the ends to mount across the rack on the front set of side flanges.
But I don't
think I need that.

>

> Being a stickler for authenticity, I was looking for that support bracket but 
> never did find one.
> So... I wound up using one of those horizontal bars/plates that were commonly 
> (DEC provided)
> mounted above and below a stack of lead counterweights, as it's mechanically 
> almost identical
> and provides exactly the same benefit in the same spot. I left it installed, 
> in case I ever wanted
> to move the TU56.

I am not sure what parts you are talking about here, or why.

>
> All this occurred in the short version of the H960 (I forget... H962? The one 
> with the sloped front).
> The sloped front at the top was just the tiniest fraction too far out to 
> allow the TU56 deck to tilt
> down - despite the fact that DEC obviously took pains to make it require no 
> clearance overhead.
> Since you're using a full height H960 with a different nameplate piece at the 
> top... it may just
>  work fine.
>
> But given the weight, I'd not try it "just to see" ;) YMMV

The recommendation in the manual is to remove the front panel from the
TU56, rack mount
the chassis and put the panel back on.

I think I do have to try it to see and I am doing it on my own. But
then again, I have rack-mounted
other heavy units on my own...

-tony

Re: Rack-mounting a TU56

[Vincent Slyngstad]

From: Jay West: Friday, December 16, 2016 11:12 AM
Speaking of which - I'll put out a call again for if anyone wants to get a 
group purchase on the motor run caps for a TU55/56


I have a couple of spares, IIRC, but since I also have a couple of TU55,
a couple of TU56, and a TU56H, I'd like to join in if there is a group
purchase.

   Vince 

RE: Rack-mounting a TU56

[Jay West]

Ok I just double-checked my 8E racks, and it refreshed my memory.

The support bracket is not necessary. I believe that it provided no benefit 
after the TU56 was mounted... it was merely present in order to make it even 
possible for one person to bolt the tu56 to the uprights. It is a non-trivial 
amount of weight, so holding it in place while bolting it in is tenuous at the 
least and most likely impossible. The support bracket just provides a front 
edge to help hold it up during installation.

Being a stickler for authenticity, I was looking for that support bracket but 
never did find one. So... I wound up using one of those horizontal bars/plates 
that were commonly (DEC provided) mounted above and below a stack of lead 
counterweights, as it's mechanically almost identical and provides exactly the 
same benefit in the same spot. I left it installed, in case I ever wanted to 
move the TU56.

All this occurred in the short version of the H960 (I forget... H962? The one 
with the sloped front). The sloped front at the top was just the tiniest 
fraction too far out to allow the TU56 deck to tilt down - despite the fact 
that DEC obviously took pains to make it require no clearance overhead. Since 
you're using a full height H960 with a different nameplate piece at the top... 
it may just work fine.

But given the weight, I'd not try it "just to see" ;) YMMV

J

RE: Rack-mounting a TU56

[Henk Gooijen]

Van: Ethan Dicks<mailto:ethan.di...@gmail.com>
Verzonden: vrijdag 16 december 2016 20:43
Aan: General Discussion: On-Topic and Off-Topic 
Posts<mailto:cctalk@classiccmp.org>
Onderwerp: Re: Rack-mounting a TU56

On Fri, Dec 16, 2016 at 2:12 PM, Jay West <jw...@classiccmp.org> wrote:
> Speaking of which - I'll put out a call again for if anyone wants to get a 
> group purchase on the motor run caps for a TU55/56

I need a few.

-ethan



I have one TU56. There will come a day that I am up to connect it …
Until then I don’t know in what shape the run caps are, so I probably
do wise to join in this group buy opportunity – depending the cost 


  *   Henk, PA8PDP

Re: Rack-mounting a TU56

[Ethan Dicks]

On Fri, Dec 16, 2016 at 2:18 PM, Tony Duell <ard.p850...@gmail.com> wrote:
> On Fri, Dec 16, 2016 at 7:12 PM, Jay West <jw...@classiccmp.org> wrote:
>> Tony wrote...
>>> Anyway, does anyone have experience of rack-mounting a TU56?
>>
>> I can tell you - be careful about putting it all the way at the top. The 
>> front deck can't tilt
>> downward if the upper edge doesn't have clearance.
>
> ARGH. I was planning on putting it at the top of the rack. But surely it will
> just catch on that plastic decor panel, I can either trim that a bit
> or put spacers under the fixing screws.

I checked my one H960 - the TC11 is at the top, then both TU56s are
below that, where someone my height can reach the tapes.  ;-)

The TU56 on a TD8E on my PDP-8/e has always been on the table.  It's
never been in a rack.  If I find another H967 cabinet, that will be a
good thing to check since the TU56 would be easy to use in the top
spot (there's no top-mount plastic panel on an H967, so it might fit
there just fine).

-ethan

Re: Rack-mounting a TU56

[Ethan Dicks]

On Fri, Dec 16, 2016 at 2:12 PM, Jay West  wrote:
> Speaking of which - I'll put out a call again for if anyone wants to get a 
> group purchase on the motor run caps for a TU55/56

I need a few.

-ethan

Re: Rack-mounting a TU56

[Tony Duell]

On Fri, Dec 16, 2016 at 7:12 PM, Jay West <jw...@classiccmp.org> wrote:
> Tony wrote...
>> Anyway, does anyone have experience of rack-mounting a TU56? It
>> clearly doesn't go on slide rails, it bolts directly to the rack
>> (hinge down the front panel for access). I have the manuals from
>> Bitsavers, they imply there is some kind of spacer block that goes
>> under the TU56. Does anyone know what that is exactly so  I can
>> attempt to make one if it is needed.
>
> Yes, I rackmounted a tu56 a few weeks ago. I also saw the docs mention that
> spacer, but I think it wasn't technically necessary based on where I was 
> putting
> it. I will go look at that rack shortly and let you know today.

OK, thanks, Are the screws through the TU56 front flanges into the
front rails of the rack
enough to support it?

I don't care too much what it looks like. If the spacer is just a
filler panel type thing
and doesn't support the TU56 in any way then I don't need to worry about
it.

>
> I can tell you - be careful about putting it all the way at the top. The 
> front deck can't tilt
> downward if the upper edge doesn't have clearance.

ARGH. I was planning on putting it at the top of the rack. But surely it will
just catch on that plastic decor panel, I can either trim that a bit
or put spacers under
the fixing screws.

The only other think I could put at the top is the PC04, perhaps that would
be easier.
>
> Then again - anyone who has met me knows I'd never mount a peripheral 
> requiring
> hands on that far up in a cabinet *grin*

I am tall enough that that is not a problem.

-tony

Re: Rack-mounting a TU56

[jos]

Speaking of which - I'll put out a call again for if anyone wants to get a 
group purchase on the motor run caps for a TU55/56


Count me in

Jos