i have using my PPA v2 for a month already, but yesterday, when i turn on the PPA, the right channel has no sound at all, at first i think that it may be the problem of the opamp, but i found that it is not true after i replace the 3 opamps with each others. so i measure the DC voltage across...

does any know the output power of PPA? how many watt is it? can it drive DT880? or i should say, can it driver DT880 well?

i want to buy DT880, but don't know where is the cheapest, can anyone help?

i am making my PPA and have finished the step 6 in http://www.tangentsoft.net/audio/ppa/amp2/steps.html, but in step 7, it told me to adjust the buffer bias by measuring the voltage across the output resistor R24, however, i can just measure 0V across R24 (no matter how i adjust the trimmer...

Hello ALL~ i am a new member here, i live in HK recently i have made a PIMETA, since i havent made a STEPS yet, so i use 2 9V batteries as the power supply. after i have done the casework and wiring, i turn on the amp. and it looks like working normally, however, 1 min. later, oops, the...