Nattawut Uamkruea, blogger and audio gear maker who passionate in vacuum tube, audio & music.
Producing electronics projects since high school. Seriously upgrade and modify vintage audio equipment for “Real Sound” concept.
He is a co-founder of Soundaries and Sentimental Studio, all audio solution provider.
Experienced and lively explore the listening rooms & audio shops in Japan as his most favorite to do.

Wednesday, December 2, 2015

Inside Marantz Model 7 Preamplifier Before Modification

Marantz model 7 still the one of best preamplifiers in golden era of analog recording.

Smart functional design from phono equalizer to last stage.

Marantz used finest components at that time,

made model 7 sound very good and familiar with music lover.

This unit has serial number 7-21777, it use Sprague Orange Drop capacitors

more than another Model 7 that I ever seen from Google. ;)

This might be repaired some points from the past and still promptly use.

But I need to replace components in signal path, power supply

and tuning some component's value to make Model 7 has more natural sound.

These photos below are current status before modification.

Will compare shot by shot again with improvement list and result.

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