I have a couple of nakamichi decks, and I find their service manuals are amongst the better ones - not perfect, but good. If you do have the service manual, hopefully the calibration procedure will be documented there. I assume you have downloaded the service manual ? (check hifiengine, they have many service manuals for free, you just have to register) I'm not familiar with this particular deck myself, but from my experience with my other decks, I can confirm its very important that the deck is calibrated for correct performance. Hoping someone with knowledge on these units give me some insight. Would adjusting the Azimuth help? As far as I am aware, it has never been adjusted. I recall seeing some trimpot(s) inside the deck that were for service technicians (tape speed and playback gain). Is there a way to calibrate the playback EQ on the Nakamichi? As I understand it, all of the trimpots on the face of the unit will only adjust settings for the recording stage (ie tape types, FM filter, etc.). *The tapes I am using is a mix of vintage (factory made) cassettes from the 80's and 90's, along with recent productions as well. It sounds rather flat (not dynamic) when comparing it to a early 2000's low-budget deck that I have (RCA SCT-510). The hum went away and all of the mechanical things seem to be working ok.buuut it doesn't have the fidelity that I was hoping for. It was a challenge, but a good exercise in patience and soldiering skills. I replaced all of the rubber parts (belts, idle tire) and ALL of the electrolytic capacitors, cleaned and de-magnitized the heads. I understand the Nak 600 isn't a very expensive unit - which is the very reason why I took on the challenge - if I screwed up, there wouldn't be any great loss, right? It worked ok, but there was some minor hum in the channels and the tape would occasionally slow down. At the start of the pandemic I took it upon myself to restore a Nakamichi 600 tape deck. ![]() How good should a Nakamichi 600 sound when restored to factory specs? And is there a way to adjust the playback EQ? When it comes to analog repairs, I am very capable of performing the work (ie replacing parts), but understanding exactly how the circuitry works is another story. I am a hobbyist restorer of many vintage items (flip clocks, tube amps, motorcycles, etc).
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