Re: Ferroresonant transformer supply repair

2019-09-10 Thread Guy Dunphy via cctalk
It's good that these caps are so readily available. But on the other hand, I don't have any sort of power supply at all, for either of my two PDP 8/S machines. Sob. Being in a 240VAC mains country doesn't help, since I understand the original DEC supplies were 110VAC input only. But I'm not

Re: Ferroresonant transformer supply repair

2019-09-10 Thread ben via cctalk
On 9/8/2019 9:54 PM, Chuck Guzis via cctalk wrote: On 9/8/19 7:41 PM, Kyle Owen via cctalk wrote: I can't seem to find motor caps that meet the voltage spec of 660V. 8uF doesn't seem like a problem, but the combination together isn't looking good. Are there any specific vendors I should be

Re: Ferroresonant transformer supply repair

2019-09-10 Thread Chris Elmquist via cctalk
On Monday (09/09/2019 at 05:55PM -0500), Kyle Owen via cctalk wrote: > On Mon, Sep 9, 2019 at 4:06 PM Marc Howard wrote: > > > BTW, Genteq is a reputable brand. It is the former GE capacitor division, > > hence the name Gen(eral Electric)teq(technology). > > > > On Mon, Sep 9, 2019 at 1:02 PM

Re: Ferroresonant transformer supply repair

2019-09-09 Thread Marc Howard via cctalk
Amazon is your friend: https://www.amazon.com/Capacitor-Motor-Quick-Connect-Snap/dp/B00HRNKI9Q/ref=sr_1_fkmr0_2?keywords=660v+capacitor+8+mfd=1568059220=gateway=8-2-fkmr0 $13 bucks. Cheep. Marc Howard On Sun, Sep 8, 2019 at 7:41 PM Kyle Owen via cctalk wrote: > On Sun, Sep 8, 2019, 20:39

Re: Ferroresonant transformer supply repair

2019-09-09 Thread Marc Howard via cctalk
BTW, Genteq is a reputable brand. It is the former GE capacitor division, hence the name Gen(eral Electric)teq(technology). On Mon, Sep 9, 2019 at 1:02 PM Marc Howard wrote: > Amazon is your friend: > > >

Re: Ferroresonant transformer supply repair

2019-09-09 Thread Chuck Guzis via cctalk
I don't know your location, but the surplus electronics/electricals vendors here in the US tend to have lots of the the older oil caps (no PCBs). e.g. https://www.electronicsurplus.com/capacitors/oil-filled-capacitor/page/2

Re: Ferroresonant transformer supply repair

2019-09-09 Thread Kyle Owen via cctalk
On Mon, Sep 9, 2019 at 4:06 PM Marc Howard wrote: > BTW, Genteq is a reputable brand. It is the former GE capacitor division, > hence the name Gen(eral Electric)teq(technology). > > On Mon, Sep 9, 2019 at 1:02 PM Marc Howard wrote: > >> Amazon is your friend: >> >> >>

Re: Ferroresonant transformer supply repair

2019-09-09 Thread Malcolm via cctalk
>Thanks! Someone else pointed me to Mouser as well. Was hoping to find something in stock, but I guess I can wait and go with Mouser; after all, the PDP-8/I has >been waiting well over 30 years for a new capacitor! > >Kyle It looks like Farnell/element14 have a couple in stock ->

Re: Ferroresonant transformer supply repair

2019-09-09 Thread Kyle Owen via cctalk
On Sun, Sep 8, 2019 at 11:18 PM Mattis Lind wrote: > Mouser has CDE 8 uF 660 VAC. 11 are on order from the manufacturer. > > > https://www.mouser.se/ProductDetail/Cornell-Dubilier-CDE/SFA66T8K475B-F?qs=sGAEpiMZZMu3dWSqd4Tl0A9wIZdhZWWRKQi0fpV8QTUDmNGSFUtTTQ%3D%3D > > I have replaced several of

Re: Ferroresonant transformer supply repair

2019-09-08 Thread Mattis Lind via cctalk
måndag 9 september 2019 skrev Kyle Owen via cctalk : > On Sun, Sep 8, 2019, 20:39 Guy Dunphy via cctalk > wrote: > > > > > > >We recently replaced the ferroresonant capacitor in a power supply on > the > > CHM's > > >PDP-1. They do fail (thankfully, not often) - and they are not > >

Re: Ferroresonant transformer supply repair

2019-09-08 Thread Chuck Guzis via cctalk
On 9/8/19 7:41 PM, Kyle Owen via cctalk wrote: > I can't seem to find motor caps that meet the voltage spec of 660V. 8uF > doesn't seem like a problem, but the combination together isn't looking > good. Are there any specific vendors I should be looking at? My usual > suspect of DigiKey isn't

Re: Ferroresonant transformer supply repair

2019-09-08 Thread Kyle Owen via cctalk
On Sun, Sep 8, 2019, 20:39 Guy Dunphy via cctalk wrote: > > > >We recently replaced the ferroresonant capacitor in a power supply on the > CHM's > >PDP-1. They do fail (thankfully, not often) - and they are not > super-critical > >as to value. If the one you're replacing has the same marked

Re: Ferroresonant transformer supply repair

2019-09-08 Thread Guy Dunphy via cctalk
At 04:54 PM 8/09/2019 -0700, you wrote: >Hi Kyle, > >On Sun, 8 Sep 2019 18:42:06 -0500 >Kyle Owen via cctalk wrote: > >> Has anyone replaced the capacitor in a ferroresonant power supply with much >> success? My current understanding is that the capacitor and transformer are >> mated as a pair,

Re: Ferroresonant transformer supply repair

2019-09-08 Thread Lyle Bickley via cctalk
Hi Kyle, On Sun, 8 Sep 2019 18:42:06 -0500 Kyle Owen via cctalk wrote: > Has anyone replaced the capacitor in a ferroresonant power supply with much > success? My current understanding is that the capacitor and transformer are > mated as a pair, so replacing just one of them would require

Ferroresonant transformer supply repair

2019-09-08 Thread Kyle Owen via cctalk
Has anyone replaced the capacitor in a ferroresonant power supply with much success? My current understanding is that the capacitor and transformer are mated as a pair, so replacing just one of them would require careful consideration. The PDP-8/I I'm working on has a 704A in it, with a GE 8uF