|
Post by tacoboy on Mar 8, 2012 0:30:09 GMT
I know someone that is looking for an amplifier for their AKG 701 headphones, they were told tube amps. do not work well with the AKG 701s. I thought the tubes were great for suppyling current to headphones like the AKG's
Has anyone here tried the AKG 701s with the single tube headphone amplifiers?
|
|
XTRProf
Fully Modded
Pssst ! Got any spare capacitors ?
Posts: 5,689
|
Post by XTRProf on Mar 8, 2012 3:40:57 GMT
I know someone that is looking for an amplifier for their AKG 701 headphones, they were told tube amps. do not work well with the AKG 701s. I thought the tubes were great for suppyling current to headphones like the AKG's Has anyone here tried the AKG 701s with the single tube headphone amplifiers? The 701, as many had experienced, is on the brighter side of neutral. So a tube amp will suit it just fine. Btw, tube is not good at supplying current but voltage. SS is better in supplying current. The reverse.
|
|
|
Post by tacoboy on Mar 8, 2012 4:45:28 GMT
I know someone that is looking for an amplifier for their AKG 701 headphones, they were told tube amps. do not work well with the AKG 701s. I thought the tubes were great for suppyling current to headphones like the AKG's Has anyone here tried the AKG 701s with the single tube headphone amplifiers? The 701, as many had experienced, is on the brighter side of neutral. So a tube amp will suit it just fine. Btw, tube is not good at supplying current but voltage. SS is better in supplying current. The reverse. Thanks.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Mar 8, 2012 6:14:22 GMT
Most OTL (all) tube amps are NOT good at supplying current. (like XTRprof states)
The question asked, however, is about the Bravo thingies (see subject line, XTRprof might have missed that) which have SS drive stages and CAN supply current, so the thesis doesn't fly for the Bravo thingies. In fact they can deliver MORE power in low Ohmic HP's than higher Ohmic HP's.
In order for K701 to sound good they need to be driven from a high-Ohmic amplifier, one that can also drive low Ohmic headphones.
The G2/G3? is 30 Ohm and the smaller versions 47 Ohm. What's needed is 120 Ohm. I have had reports from owners that changed the output resistors and have had good results.
a standard Bravo thingy has quite severe roll-off in the highs which compensates a bit for increase in highs but the 'compensation' is NOT in the same area.
The reason tubes, without (much) feedback, sound different to modern SS designs has to do with the amount of (added) harmonics, the way the higher (added) harmonics decrease in amplitude over the frequency range and the level of these distortions which can be 10 to 1000 of times higher than a C'moy for instance depending on the SPL. These added harmonics have about the same 'character' as instruments themselves also exhibit so do not seem to deteriorate the sound even when the levels are measurably high. Hence, they come across as 'natural' because of the way they are spread in the frequency domain.
They are signals ADDED to the original nonetheless. The original signal is actually changed. Some claim for the better (similar like EQ'ing can make things better)
|
|
|
Post by rmouser on Mar 10, 2012 17:39:22 GMT
For what it's worth, I have k702s running on a Little Dot MKIII and they sound quite good.
|
|
|
Post by ozelui on Apr 3, 2012 8:02:20 GMT
I own a K701s and I used them to assess the different changes as I upgraded my Indeed G2 stage by stage. Though I still need to change output resistors from 30R to 100R, my fully modded Indeed G2 (followed Frans roadmap to hotrod G2 ;-) ) provides a really nice sound through K701s, good stereo separation and plenty of detail. Will let you know how things improve once I have done the output resistor thing.
|
|
|
Post by statix on Apr 5, 2012 22:58:37 GMT
I'm looking to buy one of these hybrid tube headphone amplifiers, but I'm a little overwhelmed/confused by the choices and price points. From what I've read, the most important thing to look for is that the amp uses the IRF510 mosfet. Can you pretty much expect all newer amps from companies like Muse, Indeed, or Miridiy to use the IRF510 now, or is that just an Indeed thing? For example, this amp from Miridiy looks exactly like this amp from Indeed.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 7, 2012 16:12:29 GMT
These amps appear to be very similar and are that in many ways.
AFAIK only the Indeed (those that have it mentioned in their description) have IRF510 The Miri and Bravo e.t.c. seem to still use IRF630
The Miri has a linear volpot just like some Bravo amps. Indeed has log volpot.
This is something that should not be take lightly IF you plan to use the volume control.
The specs printed with all these offers (ebay offers) are complete nonsense and have nothing to do with the amps themselves. It looks good though to see specs... eventhough they have nothing to do with the actual specs.
Very high quality they are not. Indeed is the only offering with some degree of quality, but for that reason more expensive.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Apr 7, 2012 16:19:29 GMT
I'm looking to buy one of these hybrid tube headphone amplifiers, but I'm a little overwhelmed/confused by the choices and price points. From what I've read, the most important thing to look for is that the amp uses the IRF510 mosfet. Can you pretty much expect all newer amps from companies like Muse, Indeed, or Miridiy to use the IRF510 now, or is that just an Indeed thing? For example, this amp from Miridiy looks exactly like this amp from Indeed. I wouldn't regard these as high quality amps tbh. In fact, I don't really think it's a good idea to stick a K701 on them. They're not massively extended and so will appear to calm the K701 down, but not at the right frequencies, so you'll have a 'lumpy' treble response. They sound good but I wouldn't say that they are a high quality amp. They are better driving a lesser headphone than a K701 which will ruthlessly point out every flaw ......
|
|