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<blockquote data-quote="Lee Brenkman" data-source="post: 96492" data-attributes="member: 154">Re: Another 60s flashback system photo...My understanding that the 818A equipped SVTs were made in the prototype stage and that a mixture of those and the 6146 version were sent out with the Rolling Stones.&nbsp; The 818s were, &quot;on paper&quot; more powerful but the 6146s &quot;sounded louder&quot;.&nbsp;&nbsp; Keith Richards found a way to drive his 6146 SVTs hard enough that an alarm about long term reliability arose and they quickly changed to the 6550s for the main production runs.A pair of those prototype 811A SVTs were shipped to the sound company where I worked.&nbsp; The owner was interested in possibly adapting the power stage to a PA amp to replace his 1570s and hoping that Ampeg would sell him that part of the amp in quantity for him to re package.That deal never worked out for a number or reasons and he, and Charlie Butten eventually designed and built their own &quot;proprietary&quot; 400 watt per channel transistor amps.</blockquote>

[QUOTE="Lee Brenkman, post: 96492, member: 154"] Re: Another 60s flashback system photo... My understanding that the 818A equipped SVTs were made in the prototype stage and that a mixture of those and the 6146 version were sent out with the Rolling Stones. The 818s were, "on paper" more powerful but the 6146s "sounded louder". Keith Richards found a way to drive his 6146 SVTs hard enough that an alarm about long term reliability arose and they quickly changed to the 6550s for the main production runs. A pair of those prototype 811A SVTs were shipped to the sound company where I worked. The owner was interested in possibly adapting the power stage to a PA amp to replace his 1570s and hoping that Ampeg would sell him that part of the amp in quantity for him to re package. That deal never worked out for a number or reasons and he, and Charlie Butten eventually designed and built their own "proprietary" 400 watt per channel transistor amps. [/QUOTE]

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