New KT150 tubes?

Another titbit from elsewhere.

" My dealer has checked with Audio Research and apparently I would be able to put the KT150 in my 750s tube amp without any modification to the units. The only reason I cant do that now is because they claim they dont have enought KT150s on hand to properly match the quantity I need for the 750s. I guess this means they might adjust the bias of the KT150 in such a way that it works with my units. I have no ETA from them since they claim being very busy with the G series at the moment.

I am tempted to try sourcing the KT150s myself but given I am not them impact of the bias current have and the matching issues as well if I was to get them from the web, I guess I will be patient. I only have 700 hours on my 750s anyway so I can live with the set of KT120s I have for now! "

It's been a while - any updates on arc kt150 acceptance and release dates of G series?

Sent another message to Kal. Waiting for a response. I asked him how the GS 150 differs from the Ref 150. The specs are identical, except the GS 150 uses KT150 tubes. I think there's a marketing wrinkle here.

I had an E-mail from someone who went to RMAF and noted an ARC ref 75, tubed with KT150's. I contacted the manufacturer, whom I won't name, but is a well respected US company. He kindly replied saying the KT150's are a straight swap with the same bias setting and no modification required. He also said he thought the sound was a real upgrade. I had already been told by a retailer for ARC, he thought this would be the case, but may not apply to larger amps using more tubes, such as the Reference 150.

When I have some time, I am going to be brave and find some KT150's and give it a go.

David, mere speculation, however I suspect that the ratio of output tubes to mains Transformer(s) might be the issue, rather than power output per se.