Capacitor Cans

[rmroza]

anyone use capacitor cans (e.g. - 40/40/40) instead of the singular in the power supply section?

building another express and looking at drilling two holes and running cans!

robb

[M Fowler]

Yes I have done that before and I prefer the can caps to the stacked cap option unless I am building traditional TW for someone.

What I really find funny is how people love Marshall amps which use can caps but bad mouth the use of can caps as being somehow inferior to a cap board?

Mark

[Gibsonman63]

I put them in my Liverpool. I makes for a clean layout. If I was to do it again, I would consider moving the dropping resistors on them to get rid of some wire.

[Bob S]

I've used cans - no problem. More real estate saved. Like Gibsonman says mount the string resistors direct onto the can lugs & save even more.
I separated the can negative wires to different chassis ground points.
Just to give some separation between the output & preamp sections.

[rooster]

+1 on separating the can grounds.

In truth, I have built them with a singular ground buying some large heat shrink and isolating can #2, but later considered this folly and skipped the heatsink, letting #2 ground itself where it sat. Either build was quiet, no audio difference. Eh, but the the *better* electrical logic goes to the method with two ground paths, IMO.

[RJ Guitars]

I think Dana Hall had the first post I saw on this idea and that amp apparently sounded great. Several of us have gone down that path since and I can't recall a bad report on the idea.

I have some photos that give you a look at how I implemented this idea. In a Rocket you have to do some planning ahead because the rectifier tube and output tubes are crowded pretty close to the spot you want to mount those can caps in.

I think the thing I like best about the can cap power supply filtering scheme is how clean it can be with the power resistors mounted right on the can lugs. This amp sounds awesome by the way.

In this case I also used a Vox power tranny so the whole thing looks a little different than the average Wreck.

rj

[dorrisant]

I love the JJ cap cans and the extra space... in a Rockster anyway.

[RevD]

What is the values on the can's you guys are using? I'm putting together a parts bin express and have a 40/20/20/20 and a 32/32. My thought was to use the 40/32/32 and the 20/20/20 segments for filtering. I suppose I could spring for a 40/40 can if I had to, finances are bleak at the moment though and I'm trying to use what I have. Considering the production tolerances 32 to 40 doesn't seem all that far apart. Obviously I'm not looking for any sort of close copy with the parts that I have, if I can get a good working tone I'll be happy with it. This will be a 6v6 output tube amp, I'm not interested in el34's, although I loved them in my old Marshall that I had to sell, it doesn't seem practical for anywhere I'd be playing. Thanks!

Regards,

Don

[martin manning]

RevD, in your case I'd be inclined to use the 32/32 for the reservoir, and the 40/20/20/20 for the screen and preamp node filters. That would be the better arrangement for keeping the common grounds separated. The 32/32 may be larger than the stated value due to large plus-side tolerance, and you could easily test to see if it is large enough by tacking another 16 or 22uF in parallel.

[RevD]

Thanks Martin! I appreciate your response, that's the route I'll travel, I have quite a few single 16's and 22's (those old Tweed deluxe spare capacitors come in handy!:D ) . Much appreciated!

Regards,

Don

[M Fowler]

50/50 can and a 40/20/20/20 can

[rooster]

40-40-40 and 20-20-20 here, parallel two of the 40s(80)>choke>40, then move on to the PI and pres with the 2nd can.

[rmroza]

cool. I'll use 40/40/40 and 20/20/20 cans on the next build. I think I found some CE's yesterday that are clones of Mallory's and use the same equipment to make them, soo sounds cool to me!

[rooster]

Yes rmroza, those are the ones I use. Not had any problems either. Not cheap but they seem to be built well.

[dorrisant]

Just a thought... If you have some EL34s you might as well try them, at least to know what that option sounds like...

Tony