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Tube SPDIF output
Tube SPDIF output
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Old 15th May 2013, 02:19 PM   #11
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by Tubologic View Post
A tube powered remote-control with photomultiplier receiver ?
Somehow, I find that strangely appealing. Much like the ilea of recasing a cellphone into something like shown below, with authentic ringtone.

Is anachrotechnophilia even a word, or is it just me?
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Old 15th May 2013, 07:23 PM   #12
McGyver is offline McGyver  Poland
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I suspect the idea comes from Lukasz Fikus "Lampizator" who several years ago wrote an article about tubed SPDIF output: CD Transport Digi-Lampizator
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Old 18th May 2013, 04:21 PM   #13
Pano is offline Pano  United States
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Tube SPDIF output
Great find McGyver! Lukasz is a lot of fun.
He does show that it works. So why not?
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Old 18th May 2013, 04:27 PM   #14
McGyver is offline McGyver  Poland
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I know it works. My friend has modified by Fikus squeezebox with tubed SPDIF and it sounds decent. Noticeably better than squeezebox alone.
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Old 18th May 2013, 05:34 PM   #15
DF96 is online now DF96  England
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The nice thing about digital signals is that you can mess with them without doing too much harm. As long as the data receiver has a good signal slicer and PLL it can recover from many problems added by the well-meaning user!
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Old 18th May 2013, 05:38 PM   #16
Pano is offline Pano  United States
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Tube SPDIF output
The question is, of course: "Does a well built tube buffer hurt the SPDIF signal, help it or neither."
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Old 18th May 2013, 05:47 PM   #17
DF96 is online now DF96  England
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If the original SPDIF source is competent then the best the buffer can do is avoid damaging the signal too much. If the source is really bad then the buffer might just improve it, but then you could probably assume that the rest of the source device is poorly engineered too. A 75ohm driver is not rocket science so a designer getting that wrong is unlikely to get everything else right.
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Old 18th May 2013, 09:37 PM   #18
Tubologic is offline Tubologic  Belgium
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I'm not sure that a tube C.F with 10V (they recommend 9 to 15 volts) anode supply is the best interface for driving a 75 ohms load. The circuit uses a toroid pulse transformer for coupling which is standard practice. Such transformers can be best driven with high speed gates in parallel or discrete transistor circuits. Performance will be better but not so "warm and soft" as with the tube circuit.
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Old 18th May 2013, 09:59 PM   #19
kevinkr is offline kevinkr  United States
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Tube SPDIF output
I was asked some time ago to design a tube based spdif circuit. I didn't do it, stupid if somewhat entertaining idea... IMO.. And if you were going to do it something like a D3A, 7788 or 12BY7A as a pentode connected CF makes a lot more sense. (Well not really, but if you must..)
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Old 19th May 2013, 09:23 PM   #20
DF96 is online now DF96  England
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I seem to recall that the EL821/6CH6 was intended for use as a 75ohm video line driver.
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