Hello calieng! Nice photography! That cap looks pretty good. It's purpose is to keep high frequency noise from riding out on the B+ line. I would add a .01 capacitor in parallel as well. Keep the leads as short as possible. I'd use the fanciest Mundorfs (gold foil etc) with a voltage rating at least 100v higher than your B+ supply. I have lots of experience with power supplies and the noise that can show up on them. I used to live near a Navy base and discovered 2 volts of HF & VHF garbage on unused, unconnected phone lines in a rental house. How it got there, I don't know. I used to run a computer lab that had 51 PCs driven mad when someone plugged an extension cord through an open window and fired up a hedge trimmer outside! It took two days to get the lab back to normal. There is so much electronic stuff around these days that it is good to be as careful as possible. Please forgive those respondents with negative comments. This may be their only outlet for their hostility and it keeps them out of the bug house. Happy Listening.
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!