I'm planning a build using Moose's TW tranny set w/tube rectifier. Ultimately what I'm going for is TW articulation (especially cleans), a bit of sag, and a bit more preamp distortion available ala Dumble. Probably EL34 but being able to swap in 6V6's is a nice option.
Anyway, coming off the 300V taps I thought I'd use a Ruby 5AR4 and filter the first stage using a JJ 32/32 500V cap can. Does this sound reasonable or will I need more/less filtering?
BTW, the only reason for the cap can is purely aesthetic. I'm using a 100W Dumble chassis for the build and it'll plug the extra tube hole.
Best rectifier tube/cap can to use with Moose's TW trannys?
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- David Root
- Posts: 3540
- Joined: Fri Aug 04, 2006 3:00 pm
- Location: Chilliwack BC
5AR4 first filter cap
It's August now, but I see no-one else has addressed your question.
"Conventional wisdom" (i.e. those old dudes that designed the 5AR4 back when dirt was rocks) is that you should not hit a 5AR4 with more than about 60 mF from the first filter cap it sees, so 32+32 should be OK. After the choke/resistor immediately following, you can put in 100mF if you like really tight screen control, it's the first cap that counts.
I have 100 mF on the first cap in my current design, but it's two 5AR4s in parallel, so it doesn't violate the 60 mF each rule. It works fine!
"Conventional wisdom" (i.e. those old dudes that designed the 5AR4 back when dirt was rocks) is that you should not hit a 5AR4 with more than about 60 mF from the first filter cap it sees, so 32+32 should be OK. After the choke/resistor immediately following, you can put in 100mF if you like really tight screen control, it's the first cap that counts.
I have 100 mF on the first cap in my current design, but it's two 5AR4s in parallel, so it doesn't violate the 60 mF each rule. It works fine!