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  1. Jon Q

    ... an odyssey with spectral dmc10

    Hi Good question, but I don't know the answer. I don't know these modules, but to be honest I would never use rectifier bridges, these placed in the pcbs. They are excellent for industrial level, but not for audio. Due to the high junction capacity of the diodes, they are slow response, and...
  2. Jon Q

    Spectral DMA 150 Upgrade

    check overload, DC output and heatsink temperature
  3. Jon Q

    Spectral DMA 150 Upgrade

    adjust offset (select input for RCA, shunt center pin to ground "rca". place the multimeter on the speaker output connectors and adjust offset trimmer to 0V. Confirm and if necessary repeat this adjustment after 3 ... 4 hours. repeat the same on the other channel Bias... on 0.22R resistors of...
  4. Jon Q

    ... an odyssey with spectral dmc10

    ..." Rich Fryer is a nice boss that he won't mark up Spectral's gear at a sky high level, please look at today's high end gears and their prices! What a shame when compared to Spectral! "... I fully agree
  5. Jon Q

    Spectral DMA-90

    I had an opportunity to buy two of these units, but I let it go, that day I was very upset with myself. The copper foil is so that the two transistors have the same possible temperature (thermal pairing). Helps keep the offset (DC output) very low as possible
  6. Jon Q

    Spectral DMA 150 Upgrade

    Hi Good question, when I upgraded DMA150 the transformers had more option above 230V. (possibly 240V). "except the protection circuit transformer, it is limited by resistor" . In my house I am lucky to have a transformation station about 400 meters away. But at night, sometimes I have 238V. For...
  7. Jon Q

    Spectral SDR 4000 SL

    Yes, I agree with you, especially with magico, but with Wilson Audio I leave some reticence (this, in the various systems that I heard)
  8. Jon Q

    Spectral SDR 4000 SL

    I've heard Dartzell with DCS several times, including the monoblocs NHB-468, and I like these pre/amp and power amp, but their sound signature is quite different from spectral.
  9. Jon Q

    Spectral SDR 4000 SL

    100% agree
  10. Jon Q

    ... an odyssey with spectral dmc10

    Sir!!! After this damn microbe (covid 19) "disappear", it is always welcome. Not just to listen to music, we have food and of course ... good wine. https://julia.pt/2017/12/24/polvo-lagareiro-na-minha-consoada/ j
  11. Jon Q

    ... an odyssey with spectral dmc10

    Hi You are "terrible ....." don't take it seriously, it's just a joke .... :) "saudações" J
  12. Jon Q

    ... an odyssey with spectral dmc10

    The volume pot., had an alternative a CT2 10K-2, from Danish Audio ConneT. (a sample from a friend). After many hours of listening, I found it to be an excellent component, but for an odd reason !!!! I kept the original pot. (noble) The balance pot was replaced by the same concept by spectral...
  13. Jon Q

    ... an odyssey with spectral dmc10

    After a burn , and many hours of listening, the final choice was the same manufacturer but serie (KW + KA). The reason for this change is indicated in the previous line (#25).
  14. Jon Q

    ... an odyssey with spectral dmc10

    Initially when replacing electrolytic capacitors, the choice was nichicon (fine gold series), except the capacitors of protection circuit.
  15. Jon Q

    ... an odyssey with spectral dmc10

    Hi Good question. sometimes the best can have an unexpected result. Other times, the opinion is personal to each critic. I know Elna's capacitors and they are good capacitors. The Silmic series is a condenser, which after a period of burning, presents a full and round bass. Many people like...
  16. Jon Q

    ... an odyssey with spectral dmc10

    yes, it far surpassed all my expectations, but there are still some details to finish. It is logical that my opinion is always suspicious. j
  17. Jon Q

    ... an odyssey with spectral dmc10

    thanks j
  18. Jon Q

    ... an odyssey with spectral dmc10

    On the monitor output the TL071 was replaced (fig.28_1). Here the choice was based on several samples. In the end, the choice was between OPA627BP, personally I don't like the OPA627AP version. and another model LT1122. This model has several versions, interestingly the balanced input module of...
  19. Jon Q

    ... an odyssey with spectral dmc10

    The original impedance of output 100 ohm is now 51 ohm, so also the output XRL pin 3 is added a resistor with the same value in connection with pin 1, (ground).
  20. Jon Q

    ... an odyssey with spectral dmc10

    The original cable was replaced by neutrik connectors. Later a new cable (up-grade) was made with kimber wire, Kwik 16 (only the 4 internal wires were used), an insulated wire was also added for the ground connection. (Neotech STDCT-16 with connector mundorf-banana 4mm gold). (fig.22, 23)
  21. Jon Q

    ... an odyssey with spectral dmc10

    Another situation was to isolate the transformer, from the chassis. (fig.15_2). The xlr connector was replaced by a neutrik, the IEC was replaced by oyaide connector, gold / paladium contacts, a 4 mm connector was also added to the ground. (Preamplifier-psu) (fig.17)
  22. Jon Q

    ... an odyssey with spectral dmc10

    To improve the design on the two leds, a layout was created based on a model already made.
  23. Jon Q

    ... an odyssey with spectral dmc10

    The rca connectors have been replaced by rca whit teflon insulation, the power connector has been replaced with neutrik 5 pins. Another feature of the dmc10, it has two line outputs. The ac coupled output, the connector RCA, has been replaced by XRL in dc coupled mode. Here the impedance of pin...
  24. Jon Q

    ... an odyssey with spectral dmc10

    When replacing electrolytic capacitors, two nichicon models were tested. First for the FG series for 2 months for a testing period, then another series (FW and KA). At the end of another 2 months of testing, the choice was nichicon (FW and KA). j
  25. Jon Q

    ... an odyssey with spectral dmc10

    The dmc10, each output stage, uses 3 mosfet, 1x VN1304N2 and 2x VP1304N2. The two VP1304N2 mosfets are in parallel, to reduce the (R / ds "on" 25ohm). Some of these mosfets, having problems, were replaced by VN0109 and VP0109 with the TO92 package, (pic. 38). The spectral dmc20 also uses these...
  26. Jon Q

    ... an odyssey with spectral dmc10

    To improve the performance of the phono stage, the dip-SW was removed (fig. 24), it is now a gold-plated jumper. I am not a fan of dip-SW for the selection of cartridge loads, because they always cause problems with time, even worse when using MC cartridges. The 2x module NPD5566, socket dip 8...
  27. Jon Q

    ... an odyssey with spectral dmc10

    yes you are right, but when we replace it with the RN55E version the result is surprising, even with the RN55C series it is always superior with the 55D. The RN55E 0.1% "has only two disadvantages". It is not easy to find all the values on the market, and the other disadvantage is their price...
  28. Jon Q

    ... an odyssey with spectral dmc10

    Yes, I have 3 Fluke, 77; 87; and 87III. They never gave me any problems. To analyze other parameters I use a Tektronix TDS5054B-NV AV. It is my tool in digital domain, when I upgraded to my WADIA 6 just as a CD transport, the DAC board was removed, the output driver (AES dig. Out) was designed...
  29. Jon Q

    ... an odyssey with spectral dmc10

    The Spectral DMC10 , uses Vishay RN55D resistors (1% - 100ppm). The line amplifier the resistors (RN55D) were replaced by the RN55E version, those that work in current mode, and those that work in voltage mode, were replaced by RC55Y series of welwyn (0.1% - 15ppm), signal and feedback path. In...
  30. Jon Q

    ... an odyssey with spectral dmc10

    yes, there are alternatives...

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