Solid State Stereo Power Amplifier (1968)
Power output: 60 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 60kHz
Total harmonic distortion: 0.1%
Damping factor: 150
Input sensitivity: 1V
Signal to noise ratio: 90dB
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Reviewed Jun 10th, 2016 by dlb945
I was lucky to find a working example about 20 years ago (1996) and placed it on the Amp-Shelf driving it with a Model 7T Preamplifier. Speakers were 1978 Klipschorns and signal source was a HK T65 Turntable with a Shure V15-III cartridge. The recording was an original Chicago Transit Authority album and I placed the stylus in the groove and let the music loose!
The room immediately lit up with an acoustic representation of the studio. Then, the instruments began to appear in space, locked into an image quite real. I sat down and listened to all of the first side marveling at the sound of Castenets as the side finished. Impossibly real!
Over the years, I've updated both Marantz units with newer signal and power capacitors as well as several resistors. I own both Marantz units today with the 7T always in place and the Model 15 sharing duty with a modified Dynaco ST-70. The two amps have similar sound with the Model 15 giving the tightest bass and the ST-70 giving a a bit more lower midrange.
The Model 15 is quite tube-like, dead quiet through Khorns, and never heats up. I love it!
Reviewed May 03rd, 2016 by aquiles
Very silent, musical and powerful amplifier.Mine was serviced and changed caps; after 50 years those caps were on their last breath.You can feel the hand of Sid Smith on this one once serviced.
Reviewed Jan 10th, 2013 by zenchua
Marantz Model 15 Vintage Power Amp â€“ A hidden gem to be uncovered
My first audition with this old school amp turned out to be an unexpected mind-blowing experience, albeit this vintage amp was made almost half a century ago, around the 1966 timeframe. Marantz 15 impressed upon me greatly for its ability to dig out all the musical details and present them all nicely together and project you with the soul and inspiration of music, and just this alone is already thrilling and brilliant.
With 15 playing on my familiar sources, I was listening all the way through the end of the pieces, just for the sheer pleasure of hearing the music, as if for the first time. This kind of listening pleasure convinced me that I am hearing into the truths of recording, bringing me closer to the musical essence. Many of those once considered less well recorded or unpleasant sources suddenly came alive sounding â€œso nicelyâ€ and regained their lost glory.
It is that kind of presence and aliveness drew my immediate attention. Midrange vocals from the 15 are lucid with clarity in lyrics. Sax blowing was full of vibration texture and airiness, nearly tube alike. The bottom bass was particularly forceful and dynamic (Damping factor â€œ150â€). I could feel the slam and punch of those dynamic mid-bass drum beats. The high timbre might not be very well extended but sounded so harmonically right and pleasant. In fact, this absence of high frequency flare or noise allows for a better focus on musical essence. To demonstrate harmonic purity and transient response, I played a solo piece of acoustic guitar. And I heard it from 15 the plucking of the guitar strings and reverberations from the guitar chamber, so lively never before. Soundstage wise, 15 delivered the width with good depth and excellent imaging. This kind of sound quality should not be expected from an old amp of this age. This particular piece of 15 under review was still in its original condition (SN #10010).
All in all, Marantz 15 is such a wonderful vintage amp. It is capable of giving you the harmonic purity, warmly and yet inviting. The 15's distinct musical attributes convey the flow of emotion of the recorded performance so effortlessly, a trait all too rare in today's modern amps. With 15 coupled with my Altec Model 15 horn speakers, I am now able to sit back, relax and listen to the music, not to the speakers any longer. This kind of new listening experience is just awesome.
Current resale value of Marantz 15 on eBay is about $600. Judging its remarkable performance, it should only appreciate in value over the time horizon. Hence, this is one truly hidden gem to be uncovered one day.