burnedfingers wrote:Can the ST-70 run without a feedback loop?
Why would you want to?
Changing the feedback will change the amount of gain the amplifier has. I personally believe that amplifiers do not sound as good without some feedback.
The Van alstine modification changes the amplifiers response. It had ultra high response before and it was way above what was needed thus taxing the amplifier. After the modification the amplifier lives an easier life. Thus no need to change or eliminate the amount of feedback in my opinion.
Speaking of feedback in the ST-70, does Van Alstine move the feedback to a more common secondary tap? There are not many people using 16 ohm speaker systems these days.