Hello Mr. Optimationman:
Thank you for your response. I have my Optimation PA-250 monos running well, now that a local technician -- with expertise in engineering by way of working at some reputable firms -- has replaced some of the carbon resistors with updated metal film resistors and replaced some diodes. He apparently found the only information I have -- the Bible for this intricate point to point engineering via the Optimation PA250 manual and schematics -- quite invaluable to successful "surgery." If you need assistance, the gentlman's name is Joe Lalibert. Though he is confined by contract to work only on in-house equipment at his Company Sherbourn Technologies out of Billerica, MA, he is gracious enough to provide reasonable assistance one might need on tube amps and electrical engineering in general.
The PA250s we run have thus far performed beautifully, both from a technical standpoint and sonically. They are driven by 16 W. German EL34 tubes, namely Siemens derivatives. However, my quest for an all-out General Electric or Sylvania Fat Boy 6Ca7 configuration proves more of a struggle than I ever imagined. Should I get a hold of 16 Fat Boys, the Optimations should be an American Powerhouse to behold ad infinitum or at least until my passing. As Mr. Wolcott told me during a phone conversation, "These instruments you have exhibit numerous patented material coming together in performance that people have been trying
to achieve for 30 years. To this day, it has not been done."
Ultimately, a nice pair of Sound Labs should do justice to the Optimations' potential for power drive balanced with sonic composure. Nevertheless, with this in mind, I submit incredible respect to Mr. Wolcott's engineering and would not even let a mature adult within three feet of the PA250's for fear of voltage that can exceed a lethal 650 volts or more, at rest: Veteran engineers suggest donning one hand with leather glove and pocketing the other hand when coming into contact with these daunting masterpieces.
Hoping you prevail revamping your Optimation Series. Best wishes.
Thank you for your response. I have my Optimation PA-250 monos running well, now that a local technician -- with expertise in engineering by way of working at some reputable firms -- has replaced some of the carbon resistors with updated metal film resistors and replaced some diodes. He apparently found the only information I have -- the Bible for this intricate point to point engineering via the Optimation PA250 manual and schematics -- quite invaluable to successful "surgery." If you need assistance, the gentlman's name is Joe Lalibert. Though he is confined by contract to work only on in-house equipment at his Company Sherbourn Technologies out of Billerica, MA, he is gracious enough to provide reasonable assistance one might need on tube amps and electrical engineering in general.
The PA250s we run have thus far performed beautifully, both from a technical standpoint and sonically. They are driven by 16 W. German EL34 tubes, namely Siemens derivatives. However, my quest for an all-out General Electric or Sylvania Fat Boy 6Ca7 configuration proves more of a struggle than I ever imagined. Should I get a hold of 16 Fat Boys, the Optimations should be an American Powerhouse to behold ad infinitum or at least until my passing. As Mr. Wolcott told me during a phone conversation, "These instruments you have exhibit numerous patented material coming together in performance that people have been trying
to achieve for 30 years. To this day, it has not been done."
Ultimately, a nice pair of Sound Labs should do justice to the Optimations' potential for power drive balanced with sonic composure. Nevertheless, with this in mind, I submit incredible respect to Mr. Wolcott's engineering and would not even let a mature adult within three feet of the PA250's for fear of voltage that can exceed a lethal 650 volts or more, at rest: Veteran engineers suggest donning one hand with leather glove and pocketing the other hand when coming into contact with these daunting masterpieces.
Hoping you prevail revamping your Optimation Series. Best wishes.