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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


4 posters

    FM3 circuit boards

    baddog1946
    baddog1946
    baddog1946


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    • Post n°1

    FM3 circuit boards Empty FM3 circuit boards

    Post by baddog1946 Sun Jan 30, 2011 10:30 am

    hi:
    I am trying to find out where to buy the circuit boards for the FM3 from Bill Thomas if they are still available. Help on this greatly appreciated.
    Baddog
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    GP49
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    GP49


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    • Post n°2

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by GP49 Sun Jan 30, 2011 12:08 pm

    Perhaps...contact Bill Thomas directly?
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    Bob Latino
    Bob Latino
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    • Post n°3

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by Bob Latino Sun Jan 30, 2011 12:37 pm

    Baddog,

    Besides Bill Thomas - there is also the fellow at the "FM3 zone" that sells a complete single board that replaces ALL the boards on the FM-3 and all the wires that interconnects between the boards. Link below ..

    FM-3 complete single replacement board

    Bob
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    baddog
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    • Post n°4

    FM3 circuit boards Empty fm3 circuit boards

    Post by baddog Sun Jan 30, 2011 4:23 pm

    Anybody have Bill Thomas' contact info?
    I tried to find it on a couple of threads but no luck. Does he have a website?
    He seems to be associated somehow with Curcio but I can; get to him directly.
    His email contact would help.
    Thanks for the tips but I am already doing a tuner rebuild project with the motherboard from FM3 zone (Chauncey Epperson). Who I might mention is a great guy to work with.
    But I have four more tuners I bought for parts I want to make two out of but all the boards I can have are toast.
    Basically it is almost impossible to remove all the parts from them and not do a little damage so I wanted to get some unused replacements to do the refurbishing on them.
    Thanks
    Baddog
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    Bob Latino
    Bob Latino
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    • Post n°5

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by Bob Latino Sun Jan 30, 2011 4:34 pm

    I don't know Bill's Email address but you can contact Bill Thomas through the "Vintage Circle" on the Audio Circles. He is the moderator for the Vintage Circles. Just join the Vintage Circle and send him a PM. Link below ..

    The Vintage Circle


    Bob

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    baddog1946
    baddog1946
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    • Post n°6

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by baddog1946 Mon Jan 31, 2011 7:33 am

    Thanks Bob you are always ready with good info I appreciate your tip.
    baddog
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    denny9167
    denny9167
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    • Post n°7

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by denny9167 Sat Feb 11, 2012 7:17 pm

    I am making a new run of FM-3 boards and I have incorporated some really nice changes,compared to the old ones. The components for the de-emphasis filter are now on board,and I am incorporating DIP switches for alignment,I really liked George's idea so I thought I would integrate them on board,instead of the chassis. I would love suggestions or input. Thanks[img]FM3 circuit boards DynacoFM-3[/img]

    [img]FM3 circuit boards FM-3PC-12PEC[/img]


    Last edited by denny9167 on Sat Feb 18, 2012 4:30 pm; edited 1 time in total
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    baddog1946
    baddog1946
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    • Post n°8

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by baddog1946 Sat Feb 11, 2012 7:36 pm

    Nice job Denny!
    I like the on board switch idea as you do not have to drill any holes in the chassis like I did.
    BTW
    I see what is marked SW2 where is the other switch or is it an all in one?
    Baddog
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    denny9167
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    • Post n°9

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by denny9167 Sat Feb 11, 2012 8:45 pm

    baddog1946 wrote:Nice job Denny!
    I like the on board switch idea as you do not have to drill any holes in the chassis like I did.
    BTW
    I see what is marked SW2 where is the other switch or is it an all in one?
    Baddog

    I appreciate it,yes there are 4 switches in one package,I'll post a pic of the switch.

    [img]FM3 circuit boards BD[/img]

    You'll notice on the schematic,the pos. of each switch for both normal operation,and alignment.
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    denny9167
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    • Post n°10

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by denny9167 Sat Feb 11, 2012 9:04 pm

    baddog1946 wrote:Nice job Denny!
    I like the on board switch idea as you do not have to drill any holes in the chassis like I did.
    BTW
    I see what is marked SW2 where is the other switch or is it an all in one?
    Baddog

    Do I have the switches wired properly? The port that is marked "TP75 PC-12" is the connection to PIN 7 of the Eye tube, I might have missed something. Thanks
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    denny9167
    denny9167
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    • Post n°11

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by denny9167 Sat Feb 18, 2012 1:40 pm

    Here is the schematic for PC-8

    [img]FM3 circuit boards DynacoFM-3-1[/img]


    [img]FM3 circuit boards FM-3PC-8New[/img]
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    baddog1946
    baddog1946
    baddog1946


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    • Post n°12

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by baddog1946 Sun Feb 19, 2012 11:29 am

    Hi Denny:
    Took me a few days to respond I was moving and had a problem with my amp as well. It looks like there is also a second switch (SW-3) is that correct? but as far as I can tell you have it dialed in. The main thing was to be able to isolate 75 and 88 during the second part of the alignment and with those switches you have all the options covered. Nice job there why did you remove the picture image of the board? Can we have a anpther peek at the bottom of that board to confirm all is in order with the switches?

    BTW how much are the single boards? I think you quoted the batch price.
    Baddog


    Last edited by baddog1946 on Sun Feb 19, 2012 11:33 am; edited 1 time in total (Reason for editing : get the question worded correctly)
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    denny9167
    denny9167
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    • Post n°13

    FM3 circuit boards Empty Re: FM3 circuit boards

    Post by denny9167 Sun Feb 19, 2012 4:26 pm

    Sorry about that, I have included the top and bottom layers. The price breakdown is $40.00 per board for PC-7 and PC-12,and $75.00 per board for PC-8. Thanks

    [img]FM3 circuit boards FM-3PC-8New-1[/img]

    [img]FM3 circuit boards PC_8_Bottom_Layer[/img]
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    denny9167
    denny9167
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    • Post n°14

    FM3 circuit boards Empty Another FM-3

    Post by denny9167 Sat Mar 03, 2012 10:37 pm

    I thought I would post some pics of an FM-3 I working on for a customer w/new boards,components,greased-up tuning cap,and updated PEC's. Really nice sound!![img]FM3 circuit boards IMG_0927-1[/img]
    [img]FM3 circuit boards IMG_0928[/img]
    [img]FM3 circuit boards IMG_0929[/img]
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