RobRob Deluxe Build Filter Caps

[RickRogers]

I feel a little dumb, but have to ask. I just received some of the parts I ordered for a @robrob Deluxe build (https://robrobinette.com/RobRob_Deluxe.htm). I accidently bought a F&T 33/33uF, 450v dual axial cap rather than a single axial for the B+1 filter cap (https://www.tubesandmore.com/products/capacitor-ft-450v-3333-f-electrolytic). Is there anything I can do to make it work? I can buy a generic single axial locally, but I kind of wanted to stick with quality parts. Any suggestions?

 

[schmee]

Just use one lead of the dual side...in the B+ location? You could clip it off flush, or shrink wrap the other.

 

[RickRogers]

That's what I was thinking, but I just wanted to make sure. Thanks.

 

[Len058]

If you build it with a solid state rectifier, you could do 33-33-16 for filtering. I don't know if that's an option for all or some rectifier tubes. I understood there's a limit when using a tube but SS rectification can have better filtering.

 

[schmee]

It's an electrolytic right? So not a small body cap really? I cant think of a reason it wouldn't be fine. Deluxes have 16UF caps usually, so plenty of filter there...

 

[King Fan]

Yep. In fact 32-16-16 filtering is nice in a 5E3; tightens up the bass among other things….

 

[11 Gauge]

If you build it with a solid state rectifier, you could do 33-33-16 for filtering. I don't know if that's an option for all or some rectifier tubes. I understood there's a limit when using a tube but SS rectification can have better filtering.

A 5Y3 should be able to handle 33uF. Pretty sure I got one of those (single axial) with the intention of installing it in my 5E3 clone.

I just have no idea what 33uF to the second node would sound like.

If the overall dimensions of the 2X33uF cap are similar enough to a single axial cap, I'd just tape or heat shrink off the unused section, and use a pair of 16uF axials for the other two.

 

[RickRogers]

That's the plan.... a 33uF then a pair of 16uF. I'll cut the extra lead and tape it off. Thanks.

 

[Lowerleftcoast]

Why waste 1/2 of that cap?

Use the other half for the bypass of the 6V6 tubes cathode resistor.