Caps for Phase Linear 400 ?

[ksrigg]

http://www.ebay.com/itm/130554317910?ss ... 1423.l2649

Will this cap work for replacing the caps in a PL 400 Series I? The measurements are incorrect, and I think they are 1 3/4" in diameter. If I buy 10 or more, the price will go to $18.00 each. Would anyone be interested in doing a group buy? If so, we may be able to get an even lower price....but there may be a better alternative out there for less money. I don't know. Was just tossing this one out there to see what everyone thinks. If you want to do a group buy, let me know. My refurb / rebuild project has been placed on the back burner for now, but I hate to miss a good deal..Your thoughts, guys?

 

[laatsch55]

From the codes on the sleeving, these caps were made in the 10th week of 1996. They were made by Mallory, which no longer makes caps. All Mallory'/s are now made by Conell-Dubilier.

 

[ksrigg]

Are they a good cap? BGad cap? on a scale of 1 to 10. where would you put them? Does this age mean they have deteriorated, or do they stand up because they are polystyrene.....I'm just trying to determine if this is a vialbe filter cap solution, or merely.......yeah they will work...I have some of thess in inventory, but I think they are 32,000 mF 100V aned are probably too "thick".And can you use too much filtering and storage? Not knowing how to run the calculations for this circuit, I don't know what the transformers, etc. would like to see.....

 

[laatsch55]

Stanard formulais 1000uf for every 10 volts of rail voltage. FOR EACH RAIL = and -. 400's have 80 volts =/- . so that would equate to 8000uf per rail or 16,000 total. We generally double that . Some where we reach the point of diminishing returns. My Spec's have 88,000uf total for 91 volts on the rail. The 700's i've been puttig in 44,000uf, half of the Spec's and almost double the power on the 700's. So there are no hard and fast rules. When upgrading i'll put in as much that will fit, on a new desighn, i'll put in enough to mjust not trip a 30 amp breaker in the house panel. Those 32,00 at 100 would be a wonderful cap for the 400. Check for meter interference, i have managed to put some ofr the 100 volt , 22,000 babies in some early 400's that had the tranny set out of the chassis more. What will fit guaranteed is those 18,000uf 80 volt Cornell- Dubiliers I just put in your 400's.

 

[laatsch55]

Good cap, half their shelf life is gone, it's an electrolytic so figure 30 years from date of manufacture. After that you are looking at a ticking timebomb.