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    A new custom build

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    audiobill

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    Post by audiobill on Fri Jun 03, 2016 3:56 pm

    A new custom build Outside_5_zpsi3ohdi6c

    I wanted to share some pics of M-125s I'm building for a buddy.  When finished, they will also have green LED bulbs underlighting the driver tubes, as another major manufacturer does.  I used Krylon copper metallic paint over primer coats.

    More Pics added 6/4/2016

    https://www.flickr.com/photos/121456711@N02/


    Last edited by audiobill on Sat Jun 04, 2016 1:17 pm; edited 3 times in total
    PeterCapo
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    Post by PeterCapo on Fri Jun 03, 2016 6:07 pm

    Looks really nice.
    bluemeanies
    bluemeanies

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    Post by bluemeanies on Sat Jun 04, 2016 11:17 am

    Another outstanding job bill!
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    spin

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    Post by spin on Sat Jun 04, 2016 3:18 pm

    Beautiful!
    vtshopdog
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    Post by vtshopdog on Sat Jun 04, 2016 3:29 pm

    Is there a trick to prep the stainless for paint?  

    I had impression that it's fairly hard to get paint to adhere to SS and requires very acidic etching or etching primer to properly bond the top coat.
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    audiobill

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    Post by audiobill on Sat Jun 04, 2016 3:52 pm

    Well, this started as brushed, not polished SS. A good scrubbing with 320 grit followed by gray metal primer provided a great foundation for the Krylon paint.

    I hated painting the stainless, but love the way they look.
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    Flyquail56

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    Post by Flyquail56 on Sat Jun 04, 2016 3:58 pm

    Nice job, reminds me of some vintage Leak amps. Anybody would be thrilled to have those.
    tubes4hifi
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    Post by tubes4hifi on Sat Jun 04, 2016 7:27 pm

    yeah, I'm really surprised you could get paint to stick to stainless steel!!
    personally, I would use blue LEDs (or purple) under the tubes, not green
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    audiobill

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    Post by audiobill on Sat Jun 04, 2016 7:29 pm

    But Roy, my buddy said green!!!Smile
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    Post by mark four on Sat Jun 04, 2016 8:12 pm

    love the look . nice job , enjoy .
    Bob Latino
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    Post by Bob Latino on Sat Jun 04, 2016 8:36 pm

    Nice job Bill ! When you get those LED lights installed take a photo in dim light with the tubes on so we can see how those LED lights show up under each driver tube ... Hey, I like green ... The green LED's will match the green driver board ... A message to all > If you need a custom build of any of the VTA amps or any tube amp customization or repair, get in touch with audiobill through the personal messaging system of the forum here ...

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    Captain Coconut
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    Post by Captain Coconut on Sun Jun 05, 2016 7:56 am

    Okay, I'll be the lone dissenter. The exposed green PCB is a distraction in my mind. If there was some way to hide it and expose the two tubes, it would look great. Never cared much for exposed circuit boards and their associated parts.
    Zimmer64
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    Post by Zimmer64 on Mon Jun 06, 2016 2:16 pm

    Captain Coconut wrote:Okay, I'll be the lone dissenter. The exposed green PCB is a distraction in my mind. If there was some way to hide it and expose the two tubes, it would look great. Never cared much for exposed circuit boards and their associated parts.

    You're not alone :-) Would be nice to have an optional cover for the green board and having access holes for the bias posts well.
    Tube Nube
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    Post by Tube Nube on Mon Jun 06, 2016 2:25 pm

    Roy used to sell a plexi, or something, clear cover that stood above the amp top plate a bit. More of a protector than a cover, it didn't obscure the view. Enhanced it, I'd say. For those who think the stock version looks unfinished, I'd say it contributed a finished look.

    I dont know if this was/is available for the monoblocks, or just the st 70.
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    Post by Kentley on Mon Jun 06, 2016 3:50 pm

    Tube Nube wrote:Roy used to sell a plexi, or something, clear cover that stood above the amp top plate a bit. More of a protector than a cover, it didn't obscure the view. Enhanced it, I'd say. For those who think the stock version looks unfinished, I'd say it contributed a finished look.

    I dont know if this was/is available for the monoblocks, or just the st 70.
    Having nothing better to do, I searched the archives here and found no evidence that a plexi cover was ever available for the M-125. Roy offered the covers for the ST-70/120 - they were made-to-order for about $45.
    wgallupe
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    Post by wgallupe on Mon Jun 06, 2016 5:19 pm

    I'm also in the camp that prefers not to see an exposed board. I'm also not married to the Dynaco look. See attached pics/links. They came from Front Panel Express.

    https://dl.dropboxusercontent.com/u/91078393/009.jpg

    A new custom build 009


    https://dl.dropboxusercontent.com/u/91078393/017.jpg

    A new custom build 017
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    audiobill

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    Post by audiobill on Mon Jun 06, 2016 5:42 pm

    Back to this thread, all I can say is my buddy loves exposed boards. Very Steampunk.
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    j4570

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    Post by j4570 on Mon Jun 06, 2016 6:30 pm

    Nice job!

    And I would want orange LED's........

    That's what this is all about-preference!!!

    I really need to save up and build some M125's.

    Jason
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    Post by vtshopdog on Mon Jun 06, 2016 8:08 pm

    This glass panel was my solution to covering the PCB but still maintaining the general look of the amp.  
    Personally don't feel comfortable leaving high voltage parts exposed to touch.  Was a total pain to fabricate and mount though.



    A new custom build IMG_1889_zpsnr2wiu0f
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    Dogstar

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    Post by Dogstar on Tue Jun 07, 2016 12:15 am

    audiobill wrote:Back to this thread, all I can say is my buddy loves exposed boards.  Very Steampunk.

    Wouldn't point-to-point wiring be more appropriate for a steam powered audio amplifier?
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    audiobill

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    Post by audiobill on Tue Jun 07, 2016 5:36 am

    Or pipe-pipe wiring!
    Bob Latino
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    Post by Bob Latino on Sun Aug 28, 2016 4:12 pm

    A new custom build IMG_0961_2_zpsjaigsixn

    This is a similar "coppertone" VTA amp ... This VTA ST-120 has the transformer bells painted copper with a clear coat of satin enamel over the copper paint. The chassis has been left the stock mirror polished stainless steel. This amp was built by "audiobill" from our forum ...

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    bluemeanies
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    Post by bluemeanies on Tue Aug 30, 2016 7:44 am

    Personally I like the exposed boards...it gives the m125 more character. 
    That said there is more danger using a metal screwdriver for biasing...a ceramic screwdriver is a safer tool to use without any worries.
    Also common sense...I read on another forum someone partaking of his choice cigar and a fine brandy after dinner only slightly leaning over his tubes (on the floor) giving a taste to his McIntosh.
    BAD-ROBOT!
    Peter W.
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    Post by Peter W. on Tue Aug 30, 2016 8:13 am

    Captain Coconut wrote:Okay, I'll be the lone dissenter. The exposed green PCB is a distraction in my mind. If there was some way to hide it and expose the two tubes, it would look great. Never cared much for exposed circuit boards and their associated parts.

    I would be concerned with any wiring or connections being exposed when the amps are in operation - what with cats, dogs, and grandkids wandering about the place much of the time. Not to mention hot tubes - but a high shelf will reduce that issue, except for the cats which do go onto the upper shelves quite often.

    Just out of curiosity. There is no B+ exposed on that board?

    Pure opinion follows:

    As to LEDs, WHY? There is always the warm glow of the tubes, and a bilious green or blue would be a diversion at best. Lipstick on a pig at worst.
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    audiobill

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    Post by audiobill on Tue Aug 30, 2016 11:54 am

    Customers have many tastes, and this one liked what McIntosh did with the green leds.. In the end, he decided against it.

    Taste, like beauty is sometimes in the eye of the beholder.....

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