Question About Capacitor Upgrade in Tube Amp

@tomic601 

Interesting point on some caps being too big for the application.

But in this case I think the Mundorf Supreme SGO are in a similar size range to those being used - just better quality.

On the Muzishare X7 model I suspect the Muzishare silver label on the coupling caps is covering a Mundorf EVO silver cap. They refer to the cap as Germany in origin and has the same 1200VDC rating. I may have to try to peel the silver label off to see what is underneath. Maybe someone on here knows which caps Muzishare is rebranding?

The Muzishare X9 and X10 are using Mundorf labeled caps - EVO Supreme Oil.

The elephant in the room that no one notices is Power Supply Impedance and Phase. It is perhaps the most important and neglected aspect of HiFi design.

Capacitors have two frequency dependent properties, ESR and ESL, often ignored by engineers and almost certainly by Joe Audiophool.

The amplifier circuit, if perfect, does nothing more than regulate the power supply. If the power supply has poor phase and impedance, it passed on to the next component. Sequential components alter the preceding and this is why a really great component may get so-so response in one reviewer's system and sterling accolades in another.

Sequential components & cables all add their sonic signature.

Hence, when Walter Wannabe audiophool swaps out ReallyGoodMatch for  BigFatSilver caps, he is altering his entire system and any perceived change, improvement or not is only valid for his system.

Add in the $$$$ and time incentive, and of course it's better.

I received the Mundorf Supremes last night and got them installed this morning.

Initial impression: Upper frequencies which were rolled off are now fully there. Cymbal crashes and other higher frequency elements that were in the background or missing are now fully there.

Bass that was previously full is now taught, well defined with some punch. Best bass in a 300B SET I have heard so far.

For a little over $100 and a few minutes of time the coupling cap upgrade in this Willsenton R300 is an absolute no brainer. It is a must do upgrade. The amp is sonically deficient otherwise. So for under $1400 for amp, shipping, and upgrade I have an amp that sounds amazingly rich, holographic, and musical.

Thanks again for all the advice. 

sounds like much more than an “ initial impression “…. 

@calieng 

Congratulations with your positive outcome. It seems that the stock coupling capacitors were a sonic bottleneck. I’d say that was 100 USD well spent.

Charles