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  1. #1

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    Default Hitachi SR-604 Receiver

    I have been trying to get rid of excess stuff lately and dropped off a Yamaha receiver and ADC eq at a small local thrift store. I like going in this place because I find goodies once in a while. Apparently most who drop stuff off are doing it for a little cash as times are hard. The owner was so pleased with the stuff I have been donating that he gave me a silver face Hitachi receiver from 1979 that I was eying. I tried to refuse it as I am trying to get rid of stuff but he insisted. He knows I like to fix stuff up and he said that this one was not working.

    It is an SR-604, Class-G; whatever that is an was rather grimy to the touch. I got it home and found that the pots and switches needed a good cleaning, as did everything else, and it has some light out. DeOxit contact and fader cleaner to the rescue; it works great. I gave the rest a good cleaning and found a diamond under the dirt. This thing is like new. It didn't even have much dust inside. Now all it needs are a couple lamps and it is golden.

    The Hitachi sounds quite nice with the Advent speakers that I recently restored. I may have a nice vintage system for a basement rig.

    Anyone know anything about the Class-G amp?
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  2. #2

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    Default

    Here is a pic.Name:  IMG_0342sm.jpg
Views: 786
Size:  148.3 KB
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  3. #3

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    Default

    As I recall, Hitachi's "Class G" essentially used two sets of complementary (+ and -) DC power "rails" from the power supply, to allow short-term, higher-power operation to increase dynamic range/headroom available for signal peaks. These were fine components that were then and still are somewhat below the radar; they never quite "caught on" with the US mass-market hi-fi consumers like the bigger audio brands - despite the fact that Hitachi was (and still is, AFAIK) a huge Japanese electronics conglomerate, at least on par with Matsu****a (actually even bigger, if memory serves).

    heh, the only Hitachi Rx brochure scan I have handy is the next model up :-)


    http://img.photobucket.com/albums/v2...achiSR-703.jpg (the link isn't working for me - but it should...!
    Last edited by mhardy6647; 02-27-2013 at 08:31 AM.
    all the best,
    mrh

  4. #4

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    Default

    I think you are right. I believe Hitachi manufactured for other brands. So was the Class-G thing more of a gimmick or worth the while?
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade)
    Parasound: C/PT-600, HCA-800II; Denon: DVD-2910, DRM-800A; Monster HTS3600-MKII, Grado SR-225i

    HT:
    Denon AVR-888, Polk: RM7, PSW10, Marantz UD5005, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, DRA-825R, DCD-660, DRM-700A, DRR-780; Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S8, Monitor 5A, TSi100; Pioneer CT-6R, PL-530; Onkyo CP-1046F; Ortofon OM5E, Marantz PM5004, CD5004

  5. #5

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    Descending toward the moon in the CLEM (Chinese Lunar Excursion Module), looking for Chang'e
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    Default

    I've seen those Hitachi class Gs, but don't really have a working understanding of what difference that makes in amplification, if any (supposedly they are a design between A/B and D in their efficient use of power--more efficient than A/B but less than D) whether that translates into any improvement in sound (who knows)? I do own a couple of TOTL Realistic Tape decks that are rebadged Hitachi that are quite good for what they are. So lots of Hitachi parts and units around in that period!

    Looks like a nice unit! From the appearance, yeah '79-80 makes sense. That's when most manufacturers used that kind of colored lighting for power meter displays.

    cnh
    Last edited by cnh; 02-27-2013 at 01:10 PM.
    Onkyo TX-SR 805 System #1 HT AVR
    Office Two Channel: LSi-7s (Nakamichi CA-5, NAD 214, Pioneer BDP51fd)
    Vintage Polks: Polk Monitor 5As, Monitor 7Bs [HK 730], Monitor 10As [Marantz 2265], SDA-2Bs [Jolida JD-303, Jolida MV-MK4]
    Headphones: HD600, Q701, ATH-M50s etc. Bravo Audio Ocean amp., Onkyo P-304, Adcom GFA-555, Technics Direct Drive TT

  6. #6

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    Not as much about efficiency per se as it was meant to provide, reasonably inexpensively, reserve power (headroom) when needed. I.e., don't build a P/S and amp for 200 watts continuous, but build one that really can deliver 200 watts for short durations when the signal dynamics and load sensitivity require it.

    The above-mentioned Hitachi (three-head) cassette decks were very, very good - the R/S branded OEMs are, effectively, sleepers, as they don't have the cachet of a Tandberg or Nakamichi product - or even, say, an hk CD491 - but they don't cost like 'em, either! :-)



    Last edited by mhardy6647; 02-27-2013 at 01:21 PM.
    all the best,
    mrh

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