Audio Research Ref 3 Opinions

Guido, I have not heard about the xchange tubes! What´s all about? 6550 seems a step backwards from the 6H30P? WHo's doing/offering the upgrade? AR? I'm checking right away.

Also, you mention that you had to raise the volume to 7. You mean 70 right? That´s about the max. I could do before the Theta arrived. Now I think 60 would be the max. SPL I could handle through the 700cx and the MLs.

brgds, marcelo

Marcelo, this is apparently a change done on all new Ref 3 units leaving the factory now. Tubes are the 6550C and replace the 6H30 on the output stage. Leonard at ARC should be able to tell you more. OneObGin had his unit updated and raves about the change, but has not supplied us with a great amount of details. I have no idea how much ARC charge for an update post facto'.

Has OneObGin confirmed that this is factory made? I checked ARC and the ARCDB (better source than ARC itself) and there is no mention about it.

BTW, the 6550C & 6550EH are Power Triodes, used by ARC on their power amps, the 6H30 & 6922 are preamp ("small signal" as per ARC) tubes...I wonder if we are talking nonsense here...

I´ll check with Leonard and hear what's going on.

brgds and thanks

Marcelo

Marcelo, I reread Oneobgin's posts starting at:
http://forum.audiogon.com/cgi-bin/fr.pl?vaslt&1049587927&openfrom&151&4#151
The tubes being swapped out are the 6L6GC output tubes. Yes the update is made by ARC. I have confirmation from a dealer. Please let us know what you hear from Leonard.

Well I was wrong again. The tubes being swapped out are the 6H30 after all. OneObgin has posted more info m on his vertual system thread. Cost appears to be $59 for parts only, plus any transportation. OneObgin confirms improved bass and treble behavior after the update. Please see the few posts relating to this subject starting at::
http://forum.audiogon.com/cgi-bin/fr.pl?vaslt&1049587927&openfrom&162&4#162