New KT150 tubes?

Well folks, further somewhat encouraging news ~

"@bsandovalb, Do you know whether the owner of said Ref150 had sought/obtained official sanction for this, either from ARC Central or an ARC authorised dealer ?"

"Hi, in fact, the owner is the local ARC dealer, he also put kt150 on two ref75 owners.... Both also very happy!"

Only to be countered shortly after by this ~

"I sent aquestion to Audio Researchon using KT150 and this is his response:

One user has filled in a contact request from the website Audio Research
It follows below the summary of the data filled by the user:
Name: FRANCISCO
Surname: CANO SANCHEZ
Message:
Hi. I own AR Ref 110 and AR Ref 150 (Bi Amp, B & W 802D). I wonder if I can use the new Tungsol KT150 in my two amp, and if so, how to adjust the Bias"

"Hello Francisco,

The KT150 has not been approved for use in the Ref 150.

Best Regards,"

Kalvin Dahl
Customer Support Manager
www.audioresearch.com
[email protected].

Now, does this mean~

ARC-R&D Has conducted full testing of the KT150 in the Ref150, concluding that the extra draw of eight OPT's left too little of a safety margin with a Single mains transformer?

Or,

Testing of the KT150 within our current Reference Line is still on-going, therefore at this time "The KT150 has not been approved for use in the Ref 150"?

Or,

Just be grateful for this single line of Obfuscation.

Is it really too much to ask for a reasonable disclosure on this matter, set in context?.

We're testing now to be complete, and conclusions have been drawn, again, Is it really too much to expect an official statement to be made, together a list of which models are, or are not, cleared for use with this Fekin Tube!!!

If only Mushrooms had teeth, we could be pulling them out with pliers.

Tsushima1, why get so wound up over a tube change from 120's to 150's? Ive heard the ref150 and it is a stunning amplifier out of the box. There is also some serious time involved in life testing. You see, you cant just test 1 set of tubes in 1 amplifier, you must test a multitude of tubes under various real world conditions, voltage variations and speaker loads. ARC must also see how the tube acts in a given circuit when mis-biased. It would probably surprise you how many people don't bias properly or frequently. If you want to try the kt150's, cowboy up and buy 2 quads and drop them in your amp. If they sound great then you have your answer, if they blow a resistor or two and you have to take your amp in for repair, then you would also have your answer. At the end of the day though, we would all be outraged if ARC said "sure, try them" and they cause a problem. There would be a thread started here on Audiogon slamming ARC for shoddy testing procedures.

In due time, Im 100% positive ARC will green light the 150 for use in their current product line, just be patient.

Amen to that!

Well said Ghasley!

A little further information via 'Our man' In Costa Rica.

"Today, I went to see (and hear) the ref150 with the kt150... The owner told me it was the dealer who suggested the use of kt150, has only 62.2 hrs on the clock, but absolutely no problems... The dealer told him that an ARC representative told him it was safe to use them, he already tested a unit with kt150 with 3500 hrs so far and recomended based on his experience..."

Has ARC issued any guidelines, as yet, to their distributors and dealers with respect to this matter?
Or, have a couple of them simply 'Gone Off The Reservation'