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    My VTA ST-120 is on the way .....and other loose ramblings of an old fart

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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Thu Mar 22, 2018 1:16 pm

    good times ^^


    I'm just curious - maybe when the sun starts shining here and the temperatures go up and my EE neighbour is hard up for some cold brew will talk him in to hooking things up and satisfy my curiosity on his scopes - and learn something in the process
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Sat Mar 24, 2018 8:03 am

    Any recommendations for flac download sites?
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    Kentley

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Kentley on Sat Mar 24, 2018 8:15 am

    I am fond of HDtracks. Not only do they have a good selection in many genres, but their customer service is excellent.
    I must say, Mr. Cletus, that this thread has been most entertaining and informative. Love to run into you someday.
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Sat Mar 24, 2018 8:18 am

    Kentley wrote:I am fond of HDtracks. Not only do they have a good selection in many genres, but their customer service is excellent.
    I must say, Mr. Cletus, that this thread has been most entertaining and informative. Love to run into you someday.
    Thank you for the "HDtracks" lead and for that fine compliment! Very Happy
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Sat Mar 24, 2018 9:36 am

    Ahhh!   ...it's Saturday!   ....Tube Biasing Day! bounce
    The bias on the KT-88s have crept up some to around 57.5mA so tweaked them back to the recommended 55.0mA after a 30 minute warm-up.
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Sat Mar 24, 2018 10:16 am

    http://dynacotubeaudio.forumotion.com/t3043-vta-st-70-assembly-video-and-new-bias-recommendations-for-all-vta-amps updated recommendations Cletus

    VTA ST-120 with 6550, KT88 or KT120 output tubes > recommended bias setting is .50 VDC per each output tube which gives a bias current of 50 milliamps per each output tube.
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Sat Mar 24, 2018 10:28 am

    https://neilyoungarchives.com/#/?_k=os2fmc He has put a lot of his stuff up for free streaming in hi-res audio Cletus - fun to try even if not particularly a fan


    https://archive.org/details/GratefulDead?sort=-publicdate áll of their stuff is free on the Internet Archive in various qualities - some pretty high, some pretty low ^^
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Sat Mar 24, 2018 10:57 am

    Roy wrote:http://dynacotubeaudio.forumotion.com/t3043-vta-st-70-assembly-video-and-new-bias-recommendations-for-all-vta-amps  updated recommendations Cletus

    VTA ST-120 with 6550, KT88 or KT120 output tubes > recommended bias setting is .50 VDC per each output tube which gives a bias current of 50 milliamps per each output tube.
    Jim McShane advises to push the KT-88s at 55mA
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Sat Mar 24, 2018 11:01 am

    Duly noted ^^ I will need the punch to drive my towering infernos anyways..
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Sat Mar 24, 2018 11:20 am

    My saturday was spent fixing up an 80's pioneer turntable - last step after going over all the switches and mechanics is to polish the dust cover up nicely and put it up for sale ^^  then   on to my lovely Dual 721 for a good service job..
    Pioneer never really got into making anything high end but they made some nice tonearms imo




    I have álmost hit my target of clearing out old stuff before new stuff can come in at the ratio as set by my wife =]
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Sat Mar 24, 2018 1:05 pm

    Please don't remind me about turntables  ....having got rid of my Oracle Delphi (had a Hadcock tone arm on it and rolled quite a few cartridges) around 1992 Sad
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Sat Mar 24, 2018 1:58 pm

    oooooh those were nice indeed
    had quite a few here too..
    in the end before choosing to just get rid of it all
    the dual 721
    automatic enough for my wife
    and well sounding enough for me with the Shure V15 III

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    Pillo69

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Pillo69 on Sat Mar 24, 2018 3:17 pm

    The Dual turntables do not excite me, too much machinery.
    However I have a 1019 that is excellent. I think the best one I've seen.
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Sat Mar 24, 2018 3:26 pm

    Good engineering yes..
    721 was the best DD deck they ever made - style might not appeal ( does not to me ) but
    can't argue with the engineering.


    good stuff ^^ *skip to 5:50*
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Mon Mar 26, 2018 2:18 pm

    My Music Server / DAC

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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Tue Mar 27, 2018 10:17 am

    That is a really NSFW case isn't it ^^

    Might have found a nice wooden box for mine finally.. Got that same case but smokey black but since we use it for some intensive tasks something with some active really quiet cooling is going to have to get done the folks at Boss dont expect oddities from a 10cm GPIO extender ribbon cable so I can separate the pi and the dac into an all vertical plane - and flip the cinch jacks to the rear =]


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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Tue Mar 27, 2018 10:31 am

    Roy wrote:That is a really NSFW case isn't it ^^

    Might have found a nice wooden box for mine finally.. Got that same case but smokey black  but since we use it for some intensive tasks something with some active really quiet cooling is going to have to get done the folks at Boss dont expect oddities from a 10cm GPIO extender ribbon cable so I can separate the pi and the dac into an all vertical plane - and flip the cinch jacks to the rear =]


    Extended use of mine shows very acceptable temperatures even without heat-sinks.  Use is not even nearing the loads I put on my (heatsinked) Rpi Kodi system.
    I have heatsinks that I'll install on this one just for giggles, when my Arctic Silver epoxy finally arrives.
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Tue Mar 27, 2018 10:39 am

    Try some X/H 265 encoded media.. not so good ^^ The Pi3 will go into throttling. Also some of the emulation runs that bit smoother overclocked and cooling there is handy..

    Heatsink alone in some tests ( think I linked to those someplace on the forum earlier element14 site gotta sign up though before reading ) shows heatsink alone cán help with intermittant heat spikes but prolonged cpu intensivity so to say a fan is needed to get actual cooling and stopping the pi3 soc going into thermal throttling - the curves work out to about 10mins from what I recall what a heatsink alone gains you - after that performance is same as without a sink at all. And alu sink stuck on w 3m or arctic thermal epoxy is nice but not fool proof - there are some nice ceramic heatsinks of véry low profile mind you that outperform the alu ones quie nicely and are non conductive should they jostle out of place.. the size that fits a pi3 comes to about 4€ from Farnell. Look like flat blue erasers - sponge like structure with microscopic tubules throughout.
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Wed Mar 28, 2018 7:03 am


    foamed ceramic neat huh beats finned aluminium by a wide margin too. There is finned versions also but those are taller..
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Wed Mar 28, 2018 7:56 am

    Yup, those are very good heatsinks!
    My Rpi based Kodi video units run really hot, thus the entire aluminum case is the heatsink.
    This Music Server DAC will never see such intensive workloads as only FLAC and MP3 files are on there and it has been running non-stop for over a week without any heatsinks at all and the temps at the chips are very well below limits (hotspots are 48*C max). I think the chip begins throttling at around 83*C 
    I got some heatsinks which I will install when the Arctic Silver arrives. The heatsink for the CPU bumps on the cap that's on the underside of the Allo Boss, so I will machine a small rebate in the heatsink for some clearance  .....but, so far so good, very impressive indeed.
    I try to exclude moving parts in my builds so I try to keep away from fans if at all possible.

    Got some Diana Kraul going on on the system now   .....just lover her voice!

    Rpi Heat-sink/case for my personal Kodi Media-center   ----  the case is machined from a solid billet of 6061 aluminum and internal features contact the Rpi chips directly for maximum heat transfer.
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Wed Mar 28, 2018 9:24 am

    ^^
    That case is just    boss =D


    Read Sade is coming out with something new soon  or already has by this time..
    This week here has been filled with hmm lemme think.. Miseducation of Lauryn Hill, PJ Harvey albums, too much Foo Fighters lol ( wife )  and one of my fave live albums - Erykah Badu  Baduizm Live ...that set was   magic

    And ofcourse the little one here insists on his daily dose of Dire Straits, Johnny Cash, Michael Jackson and the Blind Boys of Alabama  - can't argue with taste XD
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    CletusB

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by CletusB on Mon Apr 02, 2018 12:35 am

    Well, we just got over Easter Sunday and the ensuing all-day family BBQ and party, celebrating the birth of our first grandchild (girl).

    Locked on to some streaming, non-stop choice 70’s music much to the appreciation of myself and the seniors in the group.

    The ST-120 / VOTTs were running pretty darned hard for over 12-hours today and performed beautifully!

    Of course my nephews and nieces got a surprise education, cause those young folk never heard-of, let alone, seen a vacuum-tube before!

    Took me back some too and prompted a reality check, recounting what I’ve had the opportunity to work with and experience over the years, as I tried to explain what they were seeing and hearing and the whole solid-state vs  thermionic thing.   .....and NO, I think they still don't get it!   LOL! Laughing
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Mon Apr 02, 2018 1:54 pm

    Congratulations Cletus that is awesome =]
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    Roy

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by Roy on Mon Apr 02, 2018 2:01 pm

    Me being able to show and tell with our own vta st 120 is just another month away I hope - another home appliance and bits and pieces of our car that fell off/ground to a halt threw a wrench into the planned purchase lol but my kid is sooo ready to help his dad..

    This morning he came to me with a collection of cardboard from the paper recycling drawer and some of the tubes my neighbour gave me from his collection and my extech meter and said daddy can we build the amplifier today?
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    deepee99

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

    Post by deepee99 on Mon Apr 02, 2018 2:08 pm

    CletusB
    As Roy said, that's awesome news. Thermionic valves rule!

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    Re: My VTA ST-120 is on the way .....and other loose ramblings of an old fart

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