First things first. Is there a set screw in the knob holding it to the shaft? Can you get a V shaped tool(s) in there to pry the knob out/off with? Can you show a exact image of what you see?
Splined teeth on the shaft. From where I'm looking at it appears it's a press fit but adhesive could have been applied @ assembly. What's your gut feeling on using two blade type screwdrivers and prying on that plastic and anodized metal(s). I would not. LoL> It's a gong show waiting to happen. I leave it up to you to determine if you wanna go for the gustO.
The knob might be glued, I quit. Breaking the amp for a knob color change does not seem a wise move.
They are very seldom glued on splines like this. Typically they are pressed on with no force to speak of. The following would be the process. I know it sounds a bit wrong but it should only be applicable for the context of knob-pulling.
But you sometimes can get too violent. Remember the lyrics from this old banger;
Because of the taper A potentiometer, you can hear a more linear sound change when you adjust the volume.
www.audiophonics.fr
@Hiten @Holdt
Thank you!@Hiten @Holdt
Sorry for not having shared a demonstrative video on swapping the volume knob earlier.
I'd like to share a simpler way to pull out the knob. Just use a piece of polishing cloth like this to wrap the knob and pull it out!
View attachment 289888
You can search for the words "apple polishing cloth" on Amazon and find it.
Thanks. In due time, you will make every customer a knob-pulling expert.@Hiten @Holdt
Sorry for not having shared a demonstrative video on swapping the volume knob earlier.
I'd like to share a simpler way to pull out the knob. Just use a piece of polishing cloth like this to wrap the knob and pull it out!
View attachment 289888
You can search for the words "apple polishing cloth" on Amazon and find it.
Yes, Fosi audio support asked me to try different power supplies, RCA cables, turning wi-fi off, using different speakers. I did all of this and the flapping is still there. Fosi asked asked me to send the circuit board back for testing. Its in transit at the moment I will let you know what they say after testing.
I've had the BT20A pro, 48V power supply for about 5 days, and I too have noticed that the amp is warm to the touch... It doesn't get unbearably hot though.
32V here, just lukewarm (much cooler than a typical AB amp with a similar power rating). At idle, power consumption around 4 watts. Playing music at reasonable volume, ca. 5 watts. I suspect it runs much cooler with the 32V PSU.
That's actually not hot for the hardware! For context, the maximum Junction temperature of the TPA3255 chip used in this amp is 150 °C according to its spec sheet. The recommended Junction temperature is 125 °C. The ambient heatsink temperature used in various tests in the spec sheet is 85 °C. And the chip has temperature self-protection features. Not that we know the temperature of the stuff in the box, but you get the drift.
Unfortunately that doesn't mean anything because it's a GOOD thing for the case to get hot on the outside because it's acting as a heatsink. A worse product could seem cooler but actually have a higher temperature inside cooking the components.
