Originally Posted by tomb
Well if I was really a smart*ss, I might say ... "Yes - $10,000" and leave it at that.
That wouldn't be very nice, but it does sort of make a couple of points:
- No one should tell you what makes a truly worthy investment or how much to invest - in anything. Even qualified financial consultants present recommendations that are full of disclaimers and caveats.
- There's an opinion that's widely shared: the AKG K7-series of phones are one of the truly great headphones. Before the advent of $1000+ headphones, there were three series that stood at the top of the world: AKG K7-series, Sennheiser HD580/600/650, and Beyer DT880 (impedance ranges). It's safe to say you can throw ever-increasing quality amps at these phones and they will respond with ever-increasing improvements. As with most things, you end up in a diminishing returns condition that at some point will reach the limit of your financial capability.
You should be careful with tube amps concerning the AKG K7-series, though. IMHO, OTL tube amps are not appropriate. This is because the K7-series is known for needing a lot of current. An OTL (output transformer-less) tube amp will be very limited in current capability. A output transformer-coupled tube amp will work well, as will a tube hybrid, such as the Starving Student. The Starving Student has enough current to power even the most stubborn planar headphones, much less the K701/2/12/etc.
If you double/triple etc csthodr followers in an OTL you can, in theory, provide massive currents
but it takes up too much current from transformer to heat more tubes
I wanted to build an amp with 4 12AU7 per channel, but that went downhill lol
Anyways, the K7__ series is fantastic. When I owned mine, I didn't find any tube amps that worked well, but the Starving Student seems to be a good option. I wasn't DIY capable at the time. I think the SS is a good project because of its simplicity and relatively low voltages, so it is easier to work with. The SS uses a MOSFET as a follower (like a tube cathode follower) to provide current, which will allow the K701 to pair well, since it has plenty of current and a low output impedance, which is crucial since the headphones are only like 62ohmsEdited by DutchGFX - 5/17/15 at 7:14am