As a follow up to a more recent post, here is some additional information.......
Although the date "February 1976" appears on the top of page 1......
Please note that the serial numbers on page 2 of the image below only reflects those that were "still covered under the 3 year warranty program". This doesn't appear to jive with the "February 1976" since there are some dates from November 1972 on page 2.
It is unfortunate that we do not have the production number history for each month of the original 700 going back to when it first when into general production in February 1971. NOTE: 700's were actually being made before February 1971 and used either no serial number at all or a number stamped vertically on the transformer end bell. These amplifiers should all have a Seattle, WA sticker on them. This also includes the "bridge amp" and Kelly DeYong amps built in 1970. With the exception of the approximately (3) bridge amps that were built, most if not all of these amps only (built before approximately February 1971) had (12) output transistors along with (4) drivers (like a Phase Linear 400 had). Hence they were not very reliable. They may even also had 70 degrees C thermal cut-outs as opposed to the later units which had 90 degrees C thermal cut-outs. So the amps also thermally cycled more often.
The very early Phase Linear 700 series 1 "bridge amps" had (16) transistors mounted on the heat-sinks like other early 700's. However, I do not know if this version used drivers or not. I have the only known survivor and I don't think it had the original outputs on it when I bought it. As many early 700's had the original transistor numbers removed to prevent copying Bob Carver's design. Bob told me that he was using Motorola transistors on them at that time. No known schematic exits either for this amp.
I have posted pictures of the bridge amp and Kelly DeYong amps elsewhere on this forum.
Ed
