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    New VTA board (Prebuilt) Voltage Problems

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    aguaazul

    Posts : 45
    Join date : 2012-07-08
    Location : Livermore, CA

    New VTA board (Prebuilt) Voltage Problems

    Post by aguaazul on Sun Jun 29, 2014 3:06 pm

    Hi, I've double checked my wiring / soldering. I can't get any Filament or B+ Voltage.

    Joe Curcio replaced the octal sockets and ran a strait, tight jumper for the Filament connections.

    Here are some pictures, any help is appreciated.

    Thanks, Blue










    MontanaWay

    Posts : 781
    Join date : 2014-02-06
    Age : 58
    Location : Brookings, Oregon

    Re: New VTA board (Prebuilt) Voltage Problems

    Post by MontanaWay on Sun Jun 29, 2014 5:41 pm

    we are assuming that you are getting filament voltage out of your transformer?

    aguaazul

    Posts : 45
    Join date : 2012-07-08
    Location : Livermore, CA

    Re: New VTA board (Prebuilt) Voltage Problems

    Post by aguaazul on Sun Jun 29, 2014 6:49 pm

    Yes, 6.7v on both sides measured at the bottom of the driver board.  I just brought it into a darker room. The tubes are lighting up. It's hard to see under the Silver Domes of the EH Tubes.


    Last edited by aguaazul on Sun Jun 29, 2014 6:59 pm; edited 2 times in total (Reason for editing : Saw the tubes light up!)

    MontanaWay

    Posts : 781
    Join date : 2014-02-06
    Age : 58
    Location : Brookings, Oregon

    Re: New VTA board (Prebuilt) Voltage Problems

    Post by MontanaWay on Sun Jun 29, 2014 7:56 pm

    what about the B+?....still 'missing'?

    aguaazul

    Posts : 45
    Join date : 2012-07-08
    Location : Livermore, CA

    Re: New VTA board (Prebuilt) Voltage Problems

    Post by aguaazul on Sun Jun 29, 2014 8:08 pm

    Nope, we're all good. Breaking it in now. Thanks.

    MontanaWay

    Posts : 781
    Join date : 2014-02-06
    Age : 58
    Location : Brookings, Oregon

    Re: New VTA board (Prebuilt) Voltage Problems

    Post by MontanaWay on Sun Jun 29, 2014 8:19 pm

    aguaazul wrote:Nope, we're all good. Breaking it in now.  Thanks.  

    good to hear, enjoy your 'new' Dynaco!

    tubes4hifi
    Admin

    Posts : 1286
    Join date : 2008-11-30

    Re: New VTA board (Prebuilt) Voltage Problems

    Post by tubes4hifi on Tue Jul 01, 2014 2:54 pm

    so what was the problem? bad connection somewhere?

    aguaazul

    Posts : 45
    Join date : 2012-07-08
    Location : Livermore, CA

    Re: New VTA board (Prebuilt) Voltage Problems

    Post by aguaazul on Wed Jul 02, 2014 12:58 pm

    Everything was fine, it was me being extra careful. 1st, the light in the room where I was testing to see if the tubes lit up was too bright. I was measuring filament voltage to ground, when I measured the filament voltage from the transformer on both leads, I had the power I needed, everywhere that it should be. After closing the drapes, the gentle glow in the driver tubes could be seen. As I moved through the next steps, everything came out perfect.

    So the problem, "Me!" being told to check the transformer voltage was the 'AH HA' moment.

    Going to dial in the PAS now. It's in the mail!

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