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In Reply to: RE: John Swenson's/Sonore microRendu at Axpona posted by Sordidman on April 18, 2016 at 15:59:52
Well I don't want to be the first to criticize this, but the tube output stage does raise some questions.
They appear to be the Svetlana SV-572. That tube went out of production ten or fifteen years ago, and I don't think they will ever be made again. You used to could find them on eBay. They are a mechanically fragile tube. That is, they don't travel long distances well. Something to think about as you try to stockpile a reserve of tubes.
The only info I could find about how they are used in this player is that they are used as a linestage. I don't know why they chose a power triode for linestage work. The 572 is damn near a transmitting tube. Those thoriated tungsten filaments sure do look cool though don't they?
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Big speakers and little amps blew my mind!
Follow Ups:
My reservation about valves that stick out, without mechanical protection, is that they are intrinsically unsafe. Anyone in UK who gets hurt by one of these will probably win big in a court case.
Much about the modern world is intrinsically unsafe. Picture two automobiles hurtling at each other at 190kph with only a yellow strip of paint in the middle of the road separating them, and they pass each other with maybe 50cm to spare. You are wholly dependent that the oncoming car isn't piloted by someone who is legally blind, retarded, mentally ill, drunk, on drugs, preoccupied with something like an electronic device, doesn't have a bee flying around in the car with them, kids aren't fighting in the back, or just plain have their head up their ass.
Exposed valves pale in comparison.
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Big speakers and little amps blew my mind!
Just another thing to complain about in old age. I suppose valves can be unsafe if you handle them while hot, but so can a cup of coffee. But the funny thing is, some morons have actually sued over hot coffee! Some folks might sue over hot valves. Who knows these days.
Not allowed in EU generally .I guess IT 'system managers' feel that they can do what they please out of ignorance.
But this is a stupid attitude.
Not allowed in EU generally.I'm not in the fricken EU, thank God!
I guess IT 'system managers' feel that they can do what they please out of ignorance.
How do IT 'system managers' relate to running equipment with exposed vacuum tubes? 1) I'm not an IT systems manager. 2) But I've run equipment with exposed vacuum tubes many times.
For some of our concerned EU friends, the trick is to not cuddle up to, kiss, suck on, lean on, or touch the vacuum tubes at all while hot. Similarly when driving a car, the trick is to not crash it. Or trip over your own two feet while walking across the street. These too can be dangerous but the nanny state can't protect everyone from their own stupidity. So be careful.
Edits: 04/23/16
For some of our concerned EU friends,
These days, allowing for national and regional variations, safety regulations are broadly comparable, not least because many are set by international bodies. (I accept that many EU "regulations" are back-door protectionism. Those of us living, however reluctantly, in the EU know that our concerned US friends' government would never behave like that.)
the trick is to not cuddle up to, kiss, suck on, lean on, or touch the vacuum tubes at all while hot.
My concern is not just for the adult with interesting habits - your syntax is unclear but I take it you didn't learn those "donts" the hard way - or even the one who has an otherwise trivial accident with a metal-handled broom. It's more for the child whose curiosity leads it to contact the high voltages tube circuits typically rely on.
Same problem with my beryllium tweeters. I couldn't use these if I had children (or cats) in my household, otherwise highly poisonous beryllium dust might get created and inhaled.
But then, I wonder how highly poisonous this stuff is. As a 12 year old radio ham I played with liquid mercury, lead based solder, and even managed to burn my fingers on RF on an antenna coupler (no pain, just the smell of burning flesh). I also managed to touch an active secondary of a neon sign transformer. That was exciting, as I work up across the room with no recollection of what had happened.
I am a firm supporter of the Darwin Awards. :)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
It's more for the child whose curiosity leads it to contact the high voltages tube circuits typically rely on.Of course, and it's the responsibility of parents to keep the child safe. Some inmates have sold their vacuum tube gear while others put tube cages on them if children are in the households. We don't need the government to regulate such things. IMHO we are already over regulated by our governments.
Edits: 04/24/16 04/24/16
the only possible response to posts such as yours on the subject
As Sordidman said, the microRendu is just that tiny silver box in the picture.
As for the 572 tube, you can still get them but not Svetlana branded. It was indeed a popular low cost HF (~2MHz - 30MHz) transmitting power tube or HF power amplifier tube back in the day.
Cary Audio also used it in a couple audio amps many years ago. Dennis Had also used it in older Dentron HF power amplifiers - in his past life before he started Cary Audio.
You can still get Shuguang 572B, but beware some are rejects.
Taylor 572B are available from RF Parts Company, a reputable outfit.
I didn't even see that little box. I did google the microrendu and came up with the same photo S posted. I was thinking there wasn't anything "micro" about it. Also, power tubes for a power amp makes more sense. :)
Live and learn.
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Big speakers and little amps blew my mind!
The LIO has a 7v linear power module that was custom designed for Axpona as an insert to the DAC/Integrated.
The more these little boxes pile up, the more linear power supplies & expensive connecting cables we want/need to buy.
I just recently heard & read about Vinnie's stuff. I would like to hear it, but it would be very unlikely that I would ever want to own any of it. The tubes do indeed look very cool; likely they would give my cats the opportunity to knock over more than just my speakers.
Cheers,
"Asylums with doors open wide,
Where people had paid to see inside,
For entertainment they watch his body twist
Behind his eyes he says, 'I still exist.'"
That's an interesting observation, but the thread is about the Sonore uRendu streamer. So....
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