Fender Deluxe Reverb cap question

[nosaj]

I replaced some of the caps on a Fender Deluxe Reverb http://vintagefenderamprepair.com/wp...-Schematic.pdf

In my order I received a 47uf cap 500v(overkill on voltage for sure.) The orginal was a 80uf 50V.

What exactly happens when this value is used? It sounds ok no redplating.

Thanks,
nosaj

[The Dude]

I assume this is the bias voltage filter? Yes, 500v is certainly overkill. As long as you can adjust the bias to the proper range, I see no problem. 47uf should provide adequate filtering.

[nosaj]

I assume this is the bias voltage filter? Yes, 500v is certainly overkill. As long as you can adjust the bias to the proper range, I see no problem. 47uf should provide adequate filtering.

Would cap size affect that?

[The Dude]

I'm not sure of your question? You mean physical size, UF, voltage? And, affect what?

[nosaj]

I'm not sure of your question? You mean physical size, UF, voltage? And, affect what?

Would a different cap size affect the range of choice for bias voltage?
nosaj

[Enzo]

Don't over think it, it is just a filter cap in a simple power supply circuit. Nothing fancy or high strung.

[nosaj]

Don't over think it, it is just a filter cap in a simple power supply circuit. Nothing fancy or high strung.

So if I were to experience hum I might want to add more filtering to smooth it? It sounds find just have pondering questions.

Thanks,
nosaj

[The Dude]

That's a possibility, but lots of the Fenders use 50uf or whatever. Like Enzo says, it' not that big of a deal. Check your bias and, if all is good, nothing else to worry about. I add that because, whenever you recap an amp and assuming the original caps weren't "capping" the way they should, voltages change. B+ might be slightly higher, bias voltage may change, etc. It's a good idea to at least check bias.

[52 Bill]

Are you certain that the cap was meant to be used as a replacement for the bias filter? The 47@500 would replace the two paralleled 16@450 caps really well.

[nosaj]

Are you certain that the cap was meant to be used as a replacement for the bias filter? The 47@500 would replace the two paralleled 16@450 caps really well.

The filters were ok changed sometime ago. I just replaced several .1uf caps and the bias cap was an old mallory in white plastic. I think I just ordered the wrong one.

nosaj

[mozz]

47uf/100v or 100uf/100v is fine and about the size of the original or even smaller.

[nosaj]

47uf/100v or 100uf/100v is fine and about the size of the original or even smaller.

Bias on 6v6 42.4dc millivolt Plate and 32.6 millivolt Cathode current
Other 6v6 42.2dc millivolt on plate and 33.2 millivolt Cathode current
I've been told it will get a hum after running for some time. I've got it running but still no hum yet.
nosaj

Here is the bias tool I'm using from TubeDepot
https://s3.amazonaws.com/tubedepot-c...pdf?1477059879