The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all products and all products

    Factory Wired ST70a



    Posts : 9
    Join date : 2010-01-23
    Age : 52
    Location : Gilroy CA.

    Factory Wired ST70a

    Post by extremegv1 on Mon Jan 25, 2010 3:42 pm


    Posts : 1
    Join date : 2010-05-27

    Re: Factory Wired ST70a

    Post by saranya on Thu May 27, 2010 2:28 am

    If there is one name in Hi-Fi which is synonomous with excellent sound, and at the same time with excellent price, that name is Dynaco. Of all the audio manufacturers, both past and present, Dynaco is admitedly my favorite. The engineering is clean and simple which lends itself to a special sound. In addition, I have found Dynaco equipment to be reliable - no doubt due to its military-like construction.

    Dynaco was based in Philadelphia, Pennsylvania. They manufactured several audio products in the 1950's, 60's and 70's. The equipment was available as both factory wired and as kit form. The most famous product was the ST-70 amplifier of which over 300,000 units were manufactured (factory wired and kit combined). Later during the 80's Sound Valves (Columbus, Ohio) bought the entire remaining inventory of original Dynaco parts.
    Even today this inventory is being auctioned off at ebay on the internet. Pan Orient Corporation (Panor) [Hauppauge, New York] bought the Dynaco trademark in the 90's, and today continues the heritage with their own line of Dynaco equipment.

    Various incarnations of the ST-70 were produced over the many decades of manufacture. They all have the same circuitry, except for Series II, but the part type, chassis and cage type were all different. The very first and original ST-70 can be identified by the chassis (nickel plate), cage (brown), and output transformers (Dynaco A 470 with cloth covered leads).
    The next version had a chrome plated chassis. Another version had A 470 transformers with plastic leads. The early transformers were wound by hand in the USA. Then the transformers underwent a part number change to 454326, and were outsourced to Japan for manufacture. Even later versions of the output transformers had a part number change again - to Z-326.

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