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.
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...
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...
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.
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...
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...
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).
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.