Audio Research REF 75 vs VAC Phi 200

Oregonpapa, I have read elsewhere that KT150's in the Ref 75 do NOT require the top to be left off. Can you clarify your comment? Are you saying the top won't go on due to tube height, or that you are not comfortable with proximity to the cover? On another forum, a member took temperatures on a Ref 75 cover with KT 120's and 150's and found them to be the same.
A lot of people who might try this tube may be disinclined due to a requirement to leave the top off, so please clarify. Thanks.

David12, I've never listened to a Ref75 but have read the glowing reviews.. You said it was the best amp by far in your system. By comparison can you tell us what other amps you've had that it bested? I'm trying to get a point of reference.

Bifwynne ...

Yes, its the CD-7 with the upgraded power supply and tube upgrades. Big jump in sound over the stock CD-7. In fact, quite amazing. I have it on good authority that the newer CD-6 is more analog-like ... and it has no tubes.

Dbarger ...

Yes, you're correct. The top WILL fit on with the KT-150's in place, but just barely. Even so ... leave the top off. The amp sounds better sans the top ... just like turning the meter lights off. Same thing for all of ARC's display lights.

Also, just in case you folks haven't seen this in some of my other posts; move the tube dampener rings up to as close to the top of the tubes as you can get them, and be sure that both rings are solidly touching each other. This provides for a nice overall improvement in sound.

Happy listening ...

@Oregonpapa ... I've read the same about the CD-6 being totally solid state. Can't speak about its sound. In fact, it's the SS version of the Ref CD-9. I believe the CD-6/9 use a quad mono configuration for its Burr Brown chip sets. Supposedly better sounding than the CD-8, which is my CDP.

FWIW, Kal from ARC thought I would get more bang for the buck improvement going the Ref 150 SE upgrade route than messing with my CDP. And as I posted elsewhere, I look forward to reading your comments about your Ref 75 SE when you get it back from ARC.

Bifwynne ...

According to my source, the CD-6 is a fantastic CD-Player. I'm tempted, but I really love the sound of my upgraded CD-7. It really jumped by a large margin when I installed the REF-75 into the system. It was like an entirely new CD collection ... and I have a couple of thousand of those silver discs. (Are we nutz, or what?) Based on that, I think Kal gave you some straight-up advise.