#Spectral dmc 6 preamp mod
#Spectral dmc 6 preamp manual
#Spectral dmc 6 preamp full

The center one is attached to a visible circuit board trace in the two right-hand sections, but not in the two left-side sections. To the right of each bank of three output fets I see five resistors. that was just an initial guess I had made earlier prior to contacting you.) I have attached a 'raw' picture of the board for you to mark up, and also a close-up with what I think are the correct resistors marked with an arrow. I used a similar circuit with a lot of enhancements the the NuForce P-9.Дemain, thank you so much for your help ! Here is a picture of the board. The basic circuitry has evolved and I don't know anything about the current Spectral products. Only a handful were ever modified and they can't ever return to Spectral, having been substantially changed.

#Spectral dmc 6 preamp mod

Crosby Audio had a substantial mod for the DMC-10 and the DMA-50 and DMA-100. The later DMC-10 versions got a cascoded input, that can be retrofitted to the DMC-5 and the DMC-6. The DMC-5 has an internal power supply, which brings some hum we never really got rid of. 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. Hello Demain, and thank you for designing such wonderful products !