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    second choke

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    golnie

    Posts : 3
    Join date : 2015-12-31

    second choke

    Post by golnie on Thu Feb 18, 2016 4:56 pm

    I recently put a VTA board in my ST-70 and I love it.  With the VTA board, my ST-70 sounds as good if not better than my Marantz 8B (I hope I didn't start a jihad with that statement) . I would like to put a second choke in the ST-70. Would it be wired in series or parallel to the first choke? BTW the ST-70 has the larger power transformer. Thank you in advance for any help.

    Frank

    j beede

    Posts : 316
    Join date : 2011-02-07
    Location : California

    Re: second choke

    Post by j beede on Thu Feb 18, 2016 5:53 pm

    It depends... if you want to shorten the life of your rectifier put the second choke in parallel with the first. If you want to lower your B+ and alter cathode bias put the second choke in series.

    What are you trying to accomplish?

    golnie

    Posts : 3
    Join date : 2015-12-31

    second choke

    Post by golnie on Thu Feb 18, 2016 6:40 pm

    Hi, I noticed that the ST-120 uses a second choke. I would like to use a second choke for more filtering. I have SS rectifying with 3 amp diodes.

    Thank you for your reply.

    Frank

    nmchiefsfan

    Posts : 33
    Join date : 2012-03-21

    Re: second choke

    Post by nmchiefsfan on Mon Feb 22, 2016 4:52 pm

    Golnie, I am pretty sure the 2nd choke is wired in parallel with the 1st one.

    MontanaWay

    Posts : 767
    Join date : 2014-02-06
    Age : 58
    Location : Cameron, Montana

    Re: second choke

    Post by MontanaWay on Mon Feb 22, 2016 6:07 pm

    nmchiefsfan wrote:Golnie, I am pretty sure the 2nd choke is wired in parallel with the 1st one.

    yes it is indeed!

    Bob Latino
    Admin

    Posts : 2374
    Join date : 2008-11-26
    Location : Massachusetts

    Re: second choke

    Post by Bob Latino on Mon Feb 22, 2016 6:12 pm

    The VTA ST-70 only needs one choke. The ST-120 and M-125's use two chokes. The primary reason why the two chokes are in there is to handle more current. A single C24-X choke will handle 240 milliamps which is fine for the ST-70. The ST-120 and the M-125's draw more current so the second C24-X choke is used.

    Bob

    golnie

    Posts : 3
    Join date : 2015-12-31

    Re: second choke

    Post by golnie on Tue Feb 23, 2016 8:31 am

    Thank you for your replies. I will leave well enough alone and just use one choke.

    Frank

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