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

    New VTA ST-70


    Posts : 27
    Join date : 2014-09-21
    Location : Irvine, CA

    New VTA ST-70

    Post by bluerondo on Sun Sep 21, 2014 7:21 pm


    I ordered a new VTA ST-70 kit from Bob and built it last weekend and I wanted to post something about my experience.
    It took me about 14 hours to complete the build and it worked the very first time. I had a few questions before I received the kit and Bob was great answering my questions. This forum is a great source of information. The ST-70 sounds great on Klipsch RF-35's using the Sansui 7 for the preamp. The sound is definitely better than the Sansui 7's 36 watt per channel amp (20-20KHz) about the same amount of power. 35 Watts of power seems plenty for my setup (speakers and room size). The rectifier tube went bad after a few hours playing and I ordered a couple spares and now after several hours of play it seems very stable. I put in the two 1n4007 diodes in the rectifier tube as a precaution.
    I had another minor incident, after plugging in all the tubes after making the modification one of the power tubes didn't light up. I discovered one of the filament socket pins wasn't making contact so I pushed them together a bit and that solved that problem. A suggestion, don't wiggle the tubes in, push them straight down and pull them straight up when removing so as not to bend the pins. It looks like I can't import a photo directly, have to use a link? So a photo next time.

    I'm very happy with the ST-70 and many thanks to Bob for his help.
    Bob Latino

    Posts : 2644
    Join date : 2008-11-26
    Location : Massachusetts

    Re: New VTA ST-70

    Post by Bob Latino on Sun Sep 21, 2014 8:44 pm

    Hi William,

    When you join the forum the forum software does not let you post a photo or a link for 7 days. This is to stop spammers from joining and then posting spam links or spam photos. Next week about this time you will be able to add any photos or links. Just edit your post above and add the photos and/or links. NOTE - the forum cannot store photos. You must store them on some other web site and then link to them. Read the sticky above on how to post a photo.


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