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    Another Chinese Dynaco ST-70 clone from the 1990's - the Goldox ST-70

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    Bob Latino
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    Another Chinese Dynaco ST-70 clone from the 1990's - the Goldox ST-70

    Post by Bob Latino on Thu Jul 23, 2015 8:59 pm



    About 2 years ago I made a post here about the Chinese VAA-70 MKII amplifier. Read at the previous link about the VAA-70 MKII. The Chinese also put out a "Goldox" ST-70 amplifier (seen above) in KIT form during the 1990's. Evidently neither of these Dynaco ST-70 clones took hold and both amps sold in very few numbers. The Goldox used a 12AX7 voltage amplifier stage for both channels and a 6SN7 for the phase splitter/inverter stage for each channel. The Goldox had a much more modern driver circuit than the VAA-70 MKII. Now and then I see one or the other show up on Ebay but in general both of these Dynaco ST-70 Chinese knock offs are pretty rare.

    Bob


    Last edited by Bob Latino on Fri Jul 24, 2015 7:06 am; edited 1 time in total

    Elrick

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    Re: Another Chinese Dynaco ST-70 clone from the 1990's - the Goldox ST-70

    Post by Elrick on Thu Jul 23, 2015 9:15 pm

    The power transformer looks pretty tall and where's the rectification?

    Bob Latino
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    Re: Another Chinese Dynaco ST-70 clone from the 1990's - the Goldox ST-70

    Post by Bob Latino on Fri Jul 24, 2015 7:17 am

    Elrick wrote:The power transformer looks pretty tall and where's the rectification?

    I could not get a photo of the inside wiring of the Goldox but if we don't see a rectifier tube, the amp has to have solid state rectification inside the chassis.

    Bob

    deepee99

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    Re: Another Chinese Dynaco ST-70 clone from the 1990's - the Goldox ST-70

    Post by deepee99 on Sat Jul 25, 2015 12:14 pm

    Having visited China numerous times, I've become quite fond of their people and their culture. They are great innovators as well as great imitators. There's much to dislike too, especially their use of children in the factories and mines, and the bloody air pollution. There are times in Beijing when you can't see across the street for all the coal smoke. London in the 1950s, America in the 1800s? As their middle class burgeons these things will change. Probably most anything solid-state you've got was built there. They cut corners, as they must, which is why I stay with American-built toob jobs.

    Pillo69

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    Re: Another Chinese Dynaco ST-70 clone from the 1990's - the Goldox ST-70

    Post by Pillo69 on Sat Jul 25, 2015 2:27 pm

    The height of the transformer can be by the input voltage of 240 volts.

    tubes4hifi
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    Re: Another Chinese Dynaco ST-70 clone from the 1990's - the Goldox ST-70

    Post by tubes4hifi on Tue Jul 28, 2015 3:58 pm

    two or four 10c diodes are a lot cheaper than any rectifier tube I know of . . .

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