Looking good vixr!

They isolate ok.   Unbeleivably good bottom end on these, very well controlled with bass/mid bass. Highs are a little subdued but my ears are quick to adjust. I think there is a bit of colouration with these but in a warm forgiving way.   Anyone incorperate a ribbon into a headphone before?

Here is my latest little project :D     These Headphones started life as a birthday present that I gave to my younger brother years ago. He has really enjoyed them but has given them a hard life with me having to replace the jack multiple times.   I finally decided that the cable...

I have been using mine for almost a week now, sounded average at first(my HD515's sounded more detailed) but have really come into their own over the last couple of days.   The was very suprised by them when watching the The Chronicles of Riddick last night, I have never heard a soundtrack...

  Quote: Surely headphones operate in pressure mode at low frequencies, wavelengths don't really come in to play with the conditions that headphones operate. You are right about the seal, this is essential when operating in pressure mode.    

Anyone try the Rod Elliott Headphone Amplifier?   http://sound.westhost.com/project113.htm   I have made a couple of his power amps with much success :)

  Quote:    Yeah I am going to use 1/4 jacks, RCA input, off board switches and a nice alps potentiometer for the desktop version. I will be running the desktop build off a toroid too :D

Parts for two - one desktop and one portable - just waiting on my boards :D  

How do the Millett DIY amps compare?

What voltage is it at the drain of the fets?

I personally much prefer the feel of good quality speakers.   You just cant get the same feeling from headphones, I was listening to a track last night on my speakers that made my jaw drop. The feeling in your chest from well produced bass(even at low volumes) is not reproducable with...

Second Amp Built :) -   This is hard wired to a grubdac, I have since installed a new heatsink and am waiting for a PSU to arrive.

Check the heater voltage on the heater not the gate as there will be a voltage drop between the gate and source. The IRF510's Gate-Source threashold is between 2V and 4V.

Check that R4 is not open circuit and is properly connected to ground - that could also cause the problem.

  Quote:   Sounds like either the bias on your mosfet has been tied to the 48V rail (R2+R4) or it has failed causing a drain-source short.   Check the voltage on either side of R3 to ground. Let us know.   With the circuit powered off check the resistance across R1 and R2 -...

Quote:   Cheers! :)   I was surprised how at easy it was to get working.   I think I will make use of the pentode screen for my next build :)

  Just built the amp with Fujitsu 19R-P11 pentodes(wired as triodes) and a custom 48V power supply.   There is a local electronics store clearing out their tube stock so I picked out 6 of these particular tubes hoping that they would work from the specs. I will be back for more as soon as...