Randy,
Having the C1 Capacitor upgrade will make a significant difference in how well your Premier 12 amplifiers perform. I had the upgrade done to my Premier 140 and the change was not subtle. The 140 was introduced 10 years after the Premier 12 and did not have a "tubey" sound to begin with.
I also own the Premier 11A which is in many ways a stereo version of the 12 monblocks so I am familiar, to a degree, with your amps. After the modification, the 140 was more dynamic, detailed, with better extension at the frequency extremes. Soundstaging, another 140 hallmark, also improved. It is no slouch unmodified but the upgrade was an all around improvement to areas where I thought the 140 was already strong, especially in comparison to the 11A. The 11A is a "sweeter" sounding amp and extremely musical as I imagine your Premier 12 amps are.
You will, almost certainly, lose some of that sweetness should you do the capacitor change. However, in my opinion, the benefits will far outweigh that loss.
Just my 2ยข naturally.
Having the C1 Capacitor upgrade will make a significant difference in how well your Premier 12 amplifiers perform. I had the upgrade done to my Premier 140 and the change was not subtle. The 140 was introduced 10 years after the Premier 12 and did not have a "tubey" sound to begin with.
I also own the Premier 11A which is in many ways a stereo version of the 12 monblocks so I am familiar, to a degree, with your amps. After the modification, the 140 was more dynamic, detailed, with better extension at the frequency extremes. Soundstaging, another 140 hallmark, also improved. It is no slouch unmodified but the upgrade was an all around improvement to areas where I thought the 140 was already strong, especially in comparison to the 11A. The 11A is a "sweeter" sounding amp and extremely musical as I imagine your Premier 12 amps are.
You will, almost certainly, lose some of that sweetness should you do the capacitor change. However, in my opinion, the benefits will far outweigh that loss.
Just my 2ยข naturally.