[Jones Bob]

If you aiming at 007 you May have to reconsider in the amp departement.

007 are very demanding in clean volts, so maybe you outha get a 450V KGST.

No such animal. Spritzer build the first couple of KGST with +/-400V supplies and found it ran too hot. He and Kevin Gilmore's settled on design is for +/-350V (unless you with go off board heat sinks).

 

[NoPants]

I think there is actually one 450V version out there but that guy knows what he's doing

 

[Jones Bob]

I think there is actually one 450V version out there but that guy knows what he's doing

That's good to know.

I don't need it with my SR-009. Volume knob rarely goes to 10:00.

 

[Rossliew]

Agree with Astrostar. Them 007s are really something

 

[HemiSam]

So is the general concensus that the 007 Mk1 and Mk2 need more than 350v to drive properly?  I don't see much point going in that direction if my amp isn't going to support the cans.  Hell...I started simply wanting to beef up the Koss to see what they could do...LOL.
 
HS

 

[purk]

 
So is the general concensus that the 007 Mk1 and Mk2 need more than 350v to drive properly?  I don't see much point going in that direction if my amp isn't going to support the cans.  Hell...I started simply wanting to beef up the Koss to see what they could do...LOL.
 
HS

I think the KGST running at 400v has plenty of power to drive the 007 MK1.  Better yet get the KGSSHV 500v IXY parts.  IMO, the 450V KGSSHV sanyo is a tad too warm and lush for the 007 MK1.  Spritzer's KGSSHV mini is also a good choice for the SR007 MK1.

 

[HemiSam]

  I think the KGST running at 400v has plenty of power to drive the 007 MK1.  Better yet get the KGSSHV 500v IXY parts.  IMO, the 450V KGSSHV sanyo is a tad too warm and lush for the 007 MK1.  Spritzer's KGSSHV mini is also a good choice for the SR007 MK1.

 
Thank you, purk.  I have a 350v KGST being built for me.  That's what I have to play with for now.  I committed to it and it is coming my way.
 
HS

 

[rgs9200m]

So is Mjolnir the primary source for commissioning a KGSS or KGST build?

 

[MacedonianHero]

Listening to them can be a challenge. Spent over an hour with another headfier with three different 007 mk1 and my diy-t2, trying discern any differences - 70xxx 71xx and sz1. In the end we could not discern any differences between the 71xx and the sz1, but the 70xx showed a very slight difference (ever so slightly superior to my ears), but then only on a couple of tracks. All three were great, but there is a possibility that variability in the pads (age, wear, etc) was responsible for any differences that were heard. So in all likelihood, unless you have golden ears, you will have a hard time hearing any differences without having other pairs to compare them with for an extended period of time. The mk2 (sz2) on the other hand are immediately different, and not as accurate in the low to mid bass, but nonetheless still a great headphone.

 
Great comments George! I was always curious (I'm assuming this was you and zare?) of the differences.
 
Happy New Year!

 

[MacedonianHero]

  I think the KGST running at 400v has plenty of power to drive the 007 MK1.  Better yet get the KGSSHV 500v IXY parts.  IMO, the 450V KGSSHV sanyo is a tad too warm and lush for the 007 MK1.  Spritzer's KGSSHV mini is also a good choice for the SR007 MK1.

 
I don't know about that...I seem to prefer the 450V Sanyo version...I did have the 500V IXYS version, but it sounded a tad on the "cold" side to me. But the differences were very close. Plus, the 450V sanyo version is quite a bit better with the SR-009s (my primary headphones).
 
That said, my 450V sanyo KGSSHV amp has the current cranked up beyond the typical IXYS version, not sure how much that affects what I'm hearing?

 

[mulveling]

For like 5 different builds now, I've heard absolutely no discernible correlation between high/low current and sound quality on a KGSShv. However there may be a correlation between each of the 400V/450V/500V versions and the resulting sound. I think the 450V Sanyo is da bomb when paired with a 009, but I also think the 500V IXYS does a great job with both 009 and 007 Mk I. I agree that the 500V is "colder" in comparison to the 450V.
 
Like I said before, a warm 450V with 007 Mk I is just too much for me some days. Other days, it's fine and quite enjoyable. A neutral source is a must in that pairing; a slightly bright source might even help a bit.
 
And yeah, any good KGSShv build is going to be a great amp. We're just picking nits here. 

 

[MacedonianHero]

  For like 5 different builds now, I've heard absolutely no discernible correlation between high/low current and sound quality on a KGSShv.

 
The differences were quite small and the "most" apparent using the SR-007s...but still slight. I would say the 450V is a bit sweeter sounding...but again, not by much to my ears. YMMV.

 

[NoPants]

I'm running my kgsshv onboard at 350V and voltage/volume isn't an issue

 

[HemiSam]

WINNING!
 
 

 
HS

 

[Rossliew]

No such animal. Spritzer build the first couple of KGST with +/-400V supplies and found it ran too hot. He and Kevin Gilmore's settled on design is for +/-350V (unless you with go off board heat sinks).

Mine runs hot but it has extra holes on the top chassis. No issues with it whatever