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There aren't a lot of differences in the circuitry between the DMC-10 and the DMC-5 and DMC-6. By keeping the stage gain lower I could maximize the bandwidth of the system. To match the levels of the phono section the high level inputs are all padded down. This also gives an enormous dynamic range and very high overload for a phono section. What I did was add more gain in the high level section, 20-35 dB, to make up for the low levels from the moving coil cartridge. However it has extremely low noise, typically around 3 nV per root Hz, appropriate for a moving coil input. The unusual phono implementation mentioned was actually this: the phono section has about 40 db gain typical for a moving magnet phono section. Perhaps the key differentiator in the designs was the combination of low noise and wide bandwidth. The DMC-5 and DMC-6 were value engineered versions of the DMC-10.
#SPECTRAL DMC 6 PREAMP FULL#
The DMC-10 was the first full production preamp. The first Spectral preamp was the MS-1, a true kitchen table product. Keith O Johnson took over around that time. I designed all of the Spectral preamps through the DMC-20. I thought I should clear up some of the history of the Spectral preamps here. Thank you in advance for any help you can offer on adjusting and caring for this superlative piece of equipment ! However, it's not clear where to measure the bias and offset values on each stage. It's clear that there are four sections, and each has two adjustment pots (a flat white pot with a large screw adjustment, and a smaller vertical blue pot with a tiny screw adjustment).
#SPECTRAL DMC 6 PREAMP MANUAL#
I have the manual that came with the unit, and the desired offset and bias values are given there, but there is no clue as to where on the circuit board to place the multimeter probes to check these settings. However, I do not want to use the DMC-10 for any extended period without checking the bias and offset values. I opened it up and all looked fine inside (capacitors looked intact, no signs of any stress internally), so I fired it up and it sounded wonderful driving both a solid state amp and a tube amp. I don't know if you monitor this board, but I have a DMC-10 Delta preamp that I inherited from my father (the original owner), and it has not been used in a few years.
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I do know exactly one person who was involved with the Spectral design, but I am not sure that matters.Hello Demain, and thank you for designing such wonderful products ! the people who were running Spectral are not friends of mine - no idea who is there now, or if the company exists now. There is plenty of "free" here on DiyAudio - complaints about things like this are not required, imo. So, perhaps someone wants to clone older Spectral gear and wants others to do their "homework" for them?įwiw, the schematics I have were the result of a tear down and reverse engineering of actual units.
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You want to give it away?Įven NP in a recent thread complained vigorously about some of his designs being ripped off by certain asian "opportunists"! Another highly regarded designer told me privately that he his designed were "borrowed" (without payment or permission) by a certain highly regarded British audio company - you'd know the names instantly. Do some development work on your hobby amplifier, then consider how much time you spend "getting it right" and then think about what is at stake for a small (small = not Harmon International) in terms of their designs. some mfrs do not provide their schematics in the user manual - most do not.