Question About Capacitor Upgrade in Tube Amp


Hi,

I am preparing to do a coupling capacitor upgrade on a recently purchased tube integrated amp. The two 0.22uF on the preamp tubes are fairly straight forward. But I noticed another similar model 0.33uF cap on the large filter capacitor for the B+ supply that is installed across the hot lead to ground.

Does this cap on the B+ just block high frequency noise from the power supply or does it have any effect on the amp tone? Is there any reason to "upgrade" this cap?

I know it may be hard to tell exactly what is going on without a schematic.

Also any recommendations on a good cap to use in the upgrade of the coupling caps? I was looking at Mundorf SilverGoldOil for the quality at not too crazy a price. The amp already sounds good but lacks a little clarity that I think a coupling cap swap will help with. It is SET 300B amp.

Thank you!

 

calieng

@calieng But I take your point that often the expectation of an improvement colors our impression of whether or not an upgrade has really made a difference.

I am glad that you see his point. I do not. He makes smug and arrogant assumptions about people he doesn’t even know. He has no awareness of the background and experience of contributing posters here (Who’ve provided insight and information).  Audiophools? Who are they? Again an ignorant and dismissive assumption.
A useless and unhelpful post in my opinion.

Charles

@charles1dad  I am glad that you see his point. I do not. He makes smug and arrogant assumptions about people he doesn’t even know. 

They are just words on a computer screen. Don't get mad at some LCD pixels.

Unless you are on Twitter and someone tweets a nasty message at you! That would be different. Thems fighting words! I'm a gonna start a Twitter war!

😀

Another quick thought, from personal experience. 
 

If you are doing the work yourself, one part out, one part in. Take pictures of every section you are working on before you start and after you finish. Speaking from experience here. Didn’t do that on my first recap project.  Nothing worse than being called away from the work, coming back and having a “oh crap, where does that go again…”

 

Please forgive the note if it’s already common practice, or if you are already comfortable with pulling every and then replacing everything.

@calieng 

I don’t see the need to excuse rude and obnoxious behavior. I appreciate that we view this differently and that’s fine.

Charles