Posts by AudioCats

Reserved...   ECC86 selection:   ECC86 is a low production tube. According to the internet rumors, all ECC86 were made by Amperax. However they don't sound the same, if anyone is interested in doing a...

some HCC circuitry details: * the tube is loaded using LM234 CCS ic set to about 1.5mA (actual mA depends on which standard value resistor is avaialbe). *The cathod is bias using small signal diode, either one 1N4148...

HCC86: hybrid-capacitor-coupled-86 headphone amplifier, my first offical PCB headphone project. The design goal is "an easy to build, good sounding and powerful all-purpose hybrid headphone amp for electronics DIY beginners". I have...

http://www.batteryspace.com/pcbfor37vpack.aspx

Quote: Originally Posted by gilency  I get an humming when using the Stax AC adapter. This is not an aftermarket unit, it is Stax brand. The hum goes away when I touch the iPod and happens with either...

Probably easy to just make one (using R-core transformer; wind your own secondary winding and get whatever voltage you want).

you mean it is not a part of the system and you have to buy it separately?   Might as well just mod a battery pack to 5000mAH with power pigtail and call it good. The power pack can also work as desktop power...

I suppose the hum issue doesn't exist when using the Stax wallwart?

update....   I was wrong about the "can't even find a USB charging circuit board for $15" statement. Just found out USB-> li-ion charger boards are not only available but also super...

the power at the pigtail plug is directly from battery terminals (the protection board's function is to cut off power when something goes wrong, otherwise it is just straight through). Dead silent. As quiet as a .... er,...