The earliest product of Jeff Lelin's company started with the mono amplifier Model 7. The basic design was in 1982. The design was not completed until 1984. In the same year, it was exhibited at the CES show in Las Vegas. The design The idea was to pursue the ability to smoothly reproduce the sound field space that was difficult to express with transistor amplifiers at the time. The output was a bipolar transistor, and the input stage chose FETs with similar characteristics to electron tubes. The use of a negative feedback-free design was also a major feature. Due to the high output of 350 watts, many people immediately noticed this company. The Model 7's panel is gold anodized. Model 7 was slightly improved in 1985 and became the No. 2 improved model of Model 7. In 1986, a completely new improved model No. 3 was released.
Why can't we find anything about the Model 1 regarding the schematic or service manual while it is possible to find schematics of other Rowland amplifiers?
perhaps nobody is willing to sacrifice a working amp to (very likely) destroy the module by opening it, displaying its contents and tracing out a schematic.
also, maybe Rowland wants the alleged faulty module returned if someone claims they need a new replacement to fix an amp.
no facts; just guessing at possibilities ....
also, maybe Rowland wants the alleged faulty module returned if someone claims they need a new replacement to fix an amp.
no facts; just guessing at possibilities ....
maybe....but it is not the content of the module that can arouse curiosity, but the electrical diagram or at least the correct polarization values of the bias that not possible he cannot know or find anywhere on the web.
From what I have read or what is hypothesized (but the source of information is not certain) it seems that from the beginning to the end of the production of Model 1 there were so many changes that never an released and was never made official and definitive the version of the schematic diagram.