I tried to swap the tubes (left to right and right to left). After swapping the volume difference between channels is also swapped, but the difference is smaller (~0,8dB). But then there was 2,5V difference in bias, and after correcting both bias to 12V, the difference is again 1,3dB. I...

Quote: Originally Posted by MisterX You had to swap the channels? (which means they are crosswired?) Yes. Without swapping I can't get the levels correct and inter-channel leakage is red. (only on other channel if I remember correctly). But the Millett right/left output is the...

Ok, for some reason, I had to invert the millett-soundcard input cables to get proper results. Now I can get the levels to right level with Millett volume all the up. Here is what I got: Witout any resistors: http://koti.mbnet.fi/twisted-/Millett.htm With 32ohm resistors...

Quote: Originally Posted by MisterX Parallel. Of course I tried to use 32ohm resistors in parallel with the output cables with and without the ground cable but I faced exact same problems than I tried before without resistors. I can't get the levels correct without...

Thanks for your reply Quote: Originally Posted by MisterX A switchable dummy load is preferable to testing with headphones as a load. (it's rather pointless to test a headphone amp without a load unless you plan on using it as a preamp) That is something I had in mind...

Hi, I've finished my Millett project some time ago and I've been wondering if it's possible to make some measurements of the my Millett performance with my computer. (frequency response, distortion etc) I've used RMAA to test my M-Audio FireWire 410 soundcard, is it possible to make same...

Hello everybody! I've been using Grado Sr-325i headphones for over a year now, and I really enjoy them! Now I need a second pair of headphones that I can use with my IPod. I'm looking for headphones that can be easily driven by IPod and would have same type of sound than my Grados. I'd...

Quote: Originally Posted by MiRaCL I have no clue where to get the ALPS blue velvet pot from :/ ,buy i suppose tangent's audio ship to norway,and i have to order a STEPS board from them anyway. Tangent will most probably ship to Norway. Shipping to Finland was very fast and the...

The Heatsink is still runnig very hot, so I bought a larger heatsink which I'm goin to put to the back of the eclosure, so it will cool down properly. At the moment the power switch is between the tread and the millett. This way, the tread will be powered all the time. Is this bad? Should I...

As a new DIYer who just finished his first headphone amplifier, I think I should answer this thread too. The main reasons why I wanted to make an amplifier by myself was actually curiosity and passion to learn something new, not because I needed an amplifier that much. I had some...

Quote: Originally Posted by n_maher Do you really mean 24V AC? Yes. Is that bad Quote: What's the unloaded output of the wall wart? I measured 29,2 volts. The heatsink I bought is linkable. So what I will most probably do is, I will buy another identical...

Here's my next problem: When I first tested this amplifier it was on my bed, now I moved it to my table right next to me. Right when I plugged the amplifier to my cd player I noticed very loud hum/noise comming from the headphones! I noticed that if I touch different parts (the pot, rca...

No smoke, no bad smell, just sound! That means my first amplifier project seems to work At first I couldn't get sound from the right channel, but after half an hour of swearing I noticed that the problem was in the input wiring. The original wire was almost broken, but I changed it and now...

Quote: Originally Posted by steinchen anything between 24V and 27V is fine So the 26,2 volts is just fine then. I thank you for your answers.

Well... I've spent dozens of hours reading different forums but I haven't seen any information conserning these questions. Edit: Found answer for the Noble pot question.