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ARC VT-100 Mk I, Mk II, Mk III Comparison (again)

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Posted on October 28, 2014 at 10:02:29
George S. Roland
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Posts: 1470
Location: N W Pennsylvania
Joined: March 20, 2004
I am still considering purchasing a Mk II or Mk III to replace my Mk I. I have asked about these versions before, but I have more specific questions at present, so I hope you'll indulge another inquiry.

I am not asking the general, which amp is better kind of questions here. I would like to know specifically how bass and treble performance differs amongst these three.

Does bass get tighter, crisper and cleaner, more like that of a good quality high powered solid state amp. with the Mk II or Mk III? Differences between these two in that area?

I am very sensitive to etched, overly crisp treble, which is one reason I tend to prefer tube amps in the first place, and I'd like to know what happens to the treble in the Mk II and Mk III.

Many thanks,

George

 

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I can comment on MKI to MKII difference, posted on October 29, 2014 at 08:14:47
E-Stat
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April 5, 2002
having owned the original and later having the factory upgrade it to the MKII version.

The difference was largely in terms of bass impact and dynamics. You see a daughter power supply board was added that doubled the power supply energy. They also introduced a small fan.

I suspect the MKIII would sound different using a JFET/6H30 front end. While that is their current practice today (like my SP20 preamp), the earlier versions tended to be on the overly detailed side, IMHO.

 

RE: I can comment on MKI to MKII difference, posted on October 29, 2014 at 08:20:01
George S. Roland
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Posts: 1470
Location: N W Pennsylvania
Joined: March 20, 2004
Thank you for your followup!

Didn't the Mk II version have a substantially larger transformer (the single one behind the faceplate?

Regarding the bass, do you think the onset of bass notes was a bit firmer, crisper in the Mk II than the Mk I?

Many thanks!

George

 

RE: I can comment on MKI to MKII difference, posted on October 29, 2014 at 08:27:05
E-Stat
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April 5, 2002
Don't think the power transformer changed, but it has been more than a decade ago. Looking at pics on ARCDB, it doesn't seem to be the case.

Yes, bass was tighter and crisper on my Acoustats.

 

RE: I can comment on MKI to MKII difference, posted on October 29, 2014 at 13:34:32
AbeCollins
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February 2, 2002

I owned the VT100mkII and thought the bass was full bodied and dynamic. It mated very well with my Thiel CS1.5 and Tannoy Definition D500 speakers. I believe the power supply in the mkII had more filter caps.

BTW, the main photo of the ARC VT100 on the ARCDB is of my VT100mkII from many years ago. I took that photo in my living room.


 

But of course!, posted on October 29, 2014 at 13:53:54
E-Stat
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Posts: 37648
Joined: May 12, 2000
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You take such nice pics, Abe. :)

Abe on bias procedure

 

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