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The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


3 posters

    Time Delay Relay on the VTA M-125

    cci1492
    cci1492


    Posts : 331
    Join date : 2016-05-09
    Age : 63
    Location : NJ

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    Post by cci1492 Sat Apr 08, 2017 10:51 am

    Has anyone here install the Time Delay Relay board on their M-125s ? Just curious, thanks!
    Bob Latino
    Bob Latino
    Admin


    Posts : 3259
    Join date : 2008-11-26
    Location : Massachusetts

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    Post by Bob Latino Sat Apr 08, 2017 11:41 am

    cci1492 wrote:Has anyone here install the Time Delay Relay board on their M-125s ? Just curious, thanks!

    This can be done and it works fine .. The only minor issue is that there is no hole in the chassis to mount the board. The TDR would go into the area between V3, V4, V5 and the quad cap. To retrofit to an existing amp, you lay the board inside the amp and mark the mount hole and then drill the mount hole from the inside of the chassis. Assemble the board, mount the board and connect the appropriate wiring.

    That being said, if you use a tube rectifier (which warms up slowly) or the Weber WZ68 solid state rectifier (which has a short 3 to 5 second delay built in), you don't really need the TDR ..

    Bob
    cci1492
    cci1492


    Posts : 331
    Join date : 2016-05-09
    Age : 63
    Location : NJ

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    Post by cci1492 Sat Apr 08, 2017 11:46 am

    As always, thank you Bob, enjoy the rest of your weekend!
    j beede
    j beede


    Posts : 473
    Join date : 2011-02-07
    Location : California

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    Post by j beede Sat Apr 08, 2017 12:31 pm

    As an aside... the Mark VI has a time "advance" relay. It applies B+ to the outputs immediately but delays the delivery of B+ to the front end. This seems quite backward to me. As you might expect, you can hear noise through your speakers when the relay closes. Odd.

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