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In Reply to: AUDIO RESEARCH VT130, VT100, VT200 COMPARISON posted by pro-dave on May 6, 2007 at 17:01:43:
I have a VT130 as well. Did you do the Infinicap upgrade? If not, I would say save shipping costs, bite the bullet, & DIY install four .68uf V-Cap TFTF teflon caps in the coupling positions, replacing MIT caps above & below the PCB, just to the rear of the input tubes. This will give you everything you're looking for.
Follow Ups:
Did you do your own? Did you get the parts and instructions from ARC?
I bought the Infinicaps years ago from ARC & installed them myself using directions that I think I still have if you're interested. But the Infinicaps have been surpassed by more recent cap designs & V-Cap TFTF are astonishingly good (and expensive.) You would need to buy them directly from the VH Audio website.
Incidently, with the V-Caps you'll get improved bass authority, precision & dynamics, more transparency, detailed & airy treble, corrections to pitch & timbre, less grain and more suppleness & relaxation. Requires 100-200 hours with full break-in after 400 hrs. If you want more later on, then off to the modder for a full rework. But I doubt you'll need it.
I'm intrigued I'd appreciate any info you could give.
There's not much to it. As per ARC Upgrade Instructions, remove 4 white MIT 1.0uf caps at (C4,5) (top of PCB), and remove 4 white MIT .01uf caps at (C6,7) (bottom of PCB.) The small caps are bypass caps in parallel with the large ones. Solder in 4 .68uf/600V V-Cap TFTF in vacated positions on top of PCB. Face red lead toward input tube and green lead toward power tube. Pad the replacement cap up from the PCB with double-sided cushioning tape from Radio Shack.If you can't afford V-Caps, I suggest Sonicraft Platinum or Mundorf Silver/Gold.
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