jeff rowland model 6 capacitors

I'd recommend Nichicon. The big ones usually made in Japan and very good. Parameters are more important than type.

One point I forgot to mention that these filter caps in Jeff Rowland amps have been designed to have lots of extra headroom that actually not being used. Unless they show visual wear(around electrodes or shape) I would not recommend to replace them.

I'm not sure exactly which main filter-caps the Model 6 uses, but I've had a set of four Nichicon LNT1K333MSE (33,000uf 80v 3" diameter) for my JRDG Model 3 mono-blocks on-order with DigiKey for almost a year now. Still waiting.

But on the other hand, DigiKey keeps the really good EPCOS 47,000uf 100v, 3" diameter, screw-top aluminum capacitor in stock and they are a great perfect-fit upgrade for the JRDG Model 5, Threshold S-500, and other large amps that take a 3" diameter main-filter cap. Unfortunately, they are just too tall for my Model 3s

These days I finding that some of those large older-style "computer-grade" electrolytic caps are getting down-right difficult to come by.

EPCOS 47000uF/100V Capacitors are made in China.
Use USA made Cornell Dubilier very expensive or Japan made Nichicon. Also United Chemicon is very good the big caps are made in USA. United Chemicon purchased the old Sprauge factory in North Carolina. All the big caps are made there.
I have five 47000uF capacitors. Three of them 47000uF/100V and two 47000uF/75V. Diameter 3 inches (76mm) and 4 5/8 inches long (117 mm)long.

That's odd. All the EPCOS large aluminum caps that I've bought from DigiKey of this part number are tagged Country of Origin: Germany.

I wish that I could still find the larger size Cornell Dubilier or United Chemicon caps, but many of these sizes seem to be no longer offered. Sounds like you have a nice stash there, Renjy651. Better hang on to those!

Now, occasionally on eBay you'll see a few Cornell Dubilier or United Chemicon pulls from a surplussed power supply or the like which I would avoid, and sometimes you'll even see someone selling a few pieces of NOS but you really need to check the date-code before you buy.