Search results

  1. J

    Tuner Nikko gamma 30

    Hi Thanks for your feedback I had this tuner in mind, an incredible machine, with a good upgrade, I believe it would be something.... out of the ordinary. The reason I purchased this tuner is personal, which I mentioned here. Cheers
  2. J

    Tuner Nikko gamma 30

    Thank´s Jon Pictures 3....
  3. J

    Tuner Nikko gamma 30

    pictures 2...
  4. J

    Tuner Nikko gamma 30

    pictures 1....
  5. J

    Tuner Nikko gamma 30

    Hi About 25 years ago, I had a tuner Nikko gamma 30 , but I don't know what I made of it !!!! I found this one in good condition and good price. I bought because, good times I had with it in my youth, the difference is that now it is something special for me. Yes, my professional experience...
  6. J

    Tuner Nikko gamma 30

    Hi "kach22i" Yes, I renewed the tuner, a friend, on forum provided me with the service manual, which facilitated the upgrade. About the upgrade, I intend only FM. So I deleted the AM tuning block. The three power supplies (+ 12V; + 5V and + 27V) have been changed: The muting circuit has been...
  7. J

    Spectral DMC15 / DMC20 operation manual

    Dear friends I need the complete operation manual, Spectral DMC 12 or DMC20. Someone can help me? thank you for your attention jon
  8. J

    Tuner Nikko gamma 30

    Hi I bought a Nikko gamma 30 tuner in excellent condition. I want to do a restore and a circuit upgrade. I need the schematic diagram and I think it's on the last page of the instruction manual. Someone can help me? Thank you for your attention. Atentamente/Best Regards Jon
  9. J

    Current generation Power Cable that suits Spectral Amp the best.

    Nanotec Power Strada # 309 , with Furutech connectors
  10. J

    Spectral DMA 150 Upgrade

    Hi ack When I first heard the DMA 150, it was very far from my expectations, but I saw a potential in case upgrade. At first, I just wanted to upgrade to version II, but I didn't get any response from the spectral dealer. I decided to upgrade this amplifier different from others. The reason is...
  11. J

    Spectral DMA 150 Upgrade

    Hi dan Yes, I am quite surprised by the end result , marries very well with the Vandersteen. About the pre spectral is still too early to disclose.
  12. J

    Spectral DMA 150 Upgrade

    Finally the placement of the feet, and "... music ...." jon
  13. J

    Spectral DMA 150 Upgrade

    Finally, the adjustments and some simulation tests on the protection circuit. The temperature (with the help of a laser thermometer on the transistor outside the heatsink), fig.5.1, activates the red led. Test protection [DC off-set] with the introduction of a small positive and negative DC...
  14. J

    Spectral DMA 150 Upgrade

    I mentioned how I did to reduce the noise of transformers as little as possible. Another situation that was made and not mentioned here was the insulation, transformer cables whith rubber (neoprene), they have no physical contact with the isolation chassis, (See pic. 2 and3 marked in red). It...
  15. J

    Spectral DMA 150 Upgrade

    yes, probably the transformers in the iron core factory should be "cut" to 60Hz and not to 50Hz. I have some friends who use Manley amplifiers, and they all have vibration problems (50Hz noise), some of them returned to the supplier because the noise was insurputable.
  16. J

    Spectral DMA 150 Upgrade

    I think the DMA 100 series II, uses toroidal transformers, has less noise than the [E / I] series and don't usually have problems with the 50/60 HZ
  17. J

    Spectral DMA 150 Upgrade

    Yes I am aware, and you are right, there are many people using the board phono DMC 20.
  18. J

    Spectral DMA 150 Upgrade

    ....."Now my question is how easy is it to get to the transformer.".... very simple answer ..... just disassemble everything. Where to buy https://uk.rs-online.com/web/c/fasteners-fixings/levelling-vibration-control/stud-mounts/...
  19. J

    Spectral DMA 150 Upgrade

    Hi ack Good question. The reason for not choosing a recent version is the components of SMD topology. It is not easy to upgrade, this has several reasons. De-soldering SMD components and soldering again a new component, there is always a risk of damaging the printed circuit, even if it is...
  20. J

    Spectral DMA 150 Upgrade

    One unpleasant situation I had with the DMA150 was the four damping foot. The former owner possibly removed the originals and placed them in ridiculous plastic (pic 1). I was very upset about this. I decided to make some identical to the originals, but with some slight differences aluminum...
  21. J

    Spectral DMA 150 Upgrade

    Adimon Overall all the modified steps improve. Mechanically , the replacing 10.9 steel screws made a big difference (attention to lengths). But the best, was replacing the four "ridiculous" rectifier bridges of power supply to voltage amplifier, and customizing a small pcb for ultra fast...
  22. J

    Spectral DMA 150 Upgrade

    Hi Adimon Yes, I will give my opinion, of course I am suspicious. This manufacturer (Spectral) has always fascinated me, not for its sound signature, but for the topology and technology it uses in its equipment. (I admire and respect the concept of Mr. Keith Johnson’s). In Portugal there are...
  23. J

    Spectral DMA 150 Upgrade

    I understand and accept your opinion, we here in Europe (Portugal), the mains voltage is 230V, compared to 115V has the advantage that the same power consumption of the amplifiers, the fuse has a dissipation 4 times lower, so we don't have this problem here, only if it's a very high consumption...
  24. J

    Spectral DMA 150 Upgrade

    Thank´s ack Dear ack Let me ask you a question. From your experience, what is your reference / opinion about recommendation of fuse manufacturers in Spectral amplifiers? jon
  25. J

    Spectral DMA 150 Upgrade

    Good question. The next step, will be some parts that will be made in this CNC (photo 27) for Spectral. ...other things are appearing .... jon
  26. J

    Spectral DMA 150 Upgrade

    Another situation in this upgrade is the screws. I am not in fan of the stainless steel type, I prefer black steel 10.9, It´s different result in the resonances that are provoked by several factors in the box. In fixing the IEC plug whit screws black steel 10.9, the result is surprising. This...
  27. J

    Spectral DMA 150 Upgrade

    After several tests on the voltage amplifier, has been reduced gain by the negative feedback and a small increase in the differential amplifier (NPD5566), improving Slew Rate and Settling Time. (as a matter of principle I will not put here the schematic diagram of the spectral DMA 150) I'm not...
  28. J

    Spectral DMA 150 Upgrade

    Yes that's true, the two wiring choices I have under test are the same models the brand uses. About, binding posts, I have two options, Cardas and curiously... Mundorf, in Europe is very easy find Mundorf than Cardas Both models have no gold, rhodium or silver plating, only copper. I think from...
  29. J

    Spectral DMA 150 Upgrade

    Dear ack Thanks for your reply. I already keep in mind, that I would make the connection by default. 2 positive, 3 negative, and 1 gnd. Yes, the fuses, RCA, XLR connectors, and Binding Posts, in the end I'll make a careful choice. The connection to the speaker terminals is also updated. At...
  30. J

    Spectral DMA 150 Upgrade

    The cleaning the chassis and recovering the fuse holders. The wiring has also been replaced (mains 230V) with copper Wire Teflon Insulated ... the heatsink is also entitled to a shower The wire, motherboard to chassi kept the same original wire (silver / teflon) ....

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