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In Reply to: RE: LEDS and audio pt II posted by aupiho on April 01, 2015 at 10:31:22
Your orange FLASHING leds made me think that without being blind flashes should be very disturbing especialy at night...
Then I fought why not enlighting srpp and power tube with a more diffuse light which would envelop all tubes?
The orange color reminded me my salt lamp... so you see the rest of the story :)
The result: a better midrange with more flesh on the voices wich became more 3D (whitout music became dry). It's what I thought I heard... But I have to say in the same time my kids get on my nerves...So I'll to try once again... But if you have an orange salt lamp...
I think we can mabe modulate the effect with differents bulbs: why not whith leds???
Edits: 04/01/15Follow Ups:
I use non flashing orange LEDs for the tubes
About tube tweaking:
Here in France in the haute fidelite forum a guy called Claude tried on small tubes some mumetal shields he found on old stufs and report very good results...
That made me think about such accessories made of tailpieces... with an orange led in it wich would be reflected by the chrome all around the tube...
2 in 1 solution...
Interesting....I'll have to try it.
I have noted that wrapping copper foil tape around the base of tubes makes a noticeable difference. On a 12AX7 about 6 mm wide foil just on the bottom of the tube up to the lower mica sheet. Increases midrange and upper end detail. Covering the phenolic base of power tubes does the same.
This emulates those highly desirable and expensive metal base tubes like the Sylvania metal base 6SN7, and early Philips 5AR4's and EL34's
My first idea was to use nickel chrome tailpieces to shield tube with an orange light inside reflected all around the tube by chrome.An another one in the case of an external enlightning, as you can see on the picture I post a few post before, with a salt lamp next to the tubes...
It's made of a special inox (304) with about 10% nickel and let some light going in and shield the tube. It's used for water pumps. Don't know the word in english...sorry!
Inox 316 contains nickel too
Edits: 04/02/15 04/02/15 04/02/15
and now for bigger tubes:
I'll soon receive adhesive copper so I'll test it on my 12AX7!
And maybe try too a layer of nickel foil if you see what I mean...
On my brass base 6J5 I'll try too!Some homework!!!
:)
Edits: 04/02/15 04/02/15
be sure to solder the overlapping ends as the glues will come off with heat. With nickel foil overlap the ends but be sure to round the corners, magnetism does NOT like sharp 90 degree corners.
Hi stu,
I made an another test with the salt lamp lighting the tubes: The results stills the same: a better midrange with more flesh on the voices wich became more 3D (whitout music became dry).
So there's a positive effect with orange color! Maybe better with leds?
Have to test!!!
Stu, do you have an orange salt lamp to test vs leds?
For the copper tape tweak: did you test it on bigger tubes like my 211?
David
but I have done it on KT-88's and other octals.I have salt lamps but the effect is minor, IMHO, compared to the orange LED.
Part of the salt lamps workings involve ion generation, I believe
I thought overhead LED lights in the living room or in the space with stereo equipment adversely affected the sound. Not true?
Most of the issue is result of their switching circuits which contaminate your power lines and great RFI.
Seems newer PS have much lower emissions.
Also bear in mind a pair of the LED's I use only consumes 20 mA each and their color is essential to performance.
So if I have my system on an isolated circuit LEDs wont affect the sound?
I'm not sure what you're really asking, so pardon I seem like I'm shooting off into space.........
The new generation of LED lightbulbs may affect the sound, but to put it honestly, I have the older compact fluorescents and they have not died yet so I have not experimented with the newer LED types.
I do know the current draw on the LEDs are significant lower than the compact fluorescents so that may be a beneficial factor factor. Also I notice that the fast recovery diodes are sooooo cheap everyone is using them so that may be factor too. I'll have to investigate when I have time.
I had expected the LEDS on gear would worsen the sound, but they do not, strangely ( well they have to have certain characteristics including the light emitted)
I'm talking about the led lights that come on when you flip the light switch upon walking into a room. The one on your table lamp, bedside lamp, any reading lamp. I've read that such leds emit a strong rf frequency that may affect remotes and other electrical devices. True? If, such lights as I've described might very well affect sound systems.
Those are what I thought you were referring to. Again a lot has to do with their power supply, for compact size they use switching supplies which do generate RFI.
I have noticed, as mentioned earlier. newer power supplies ( which are becoming quite sophisticated) seem to be using fast recovery diodes ( to further energy savings, maybe?) so emissions seem to have dropped a bit. I haven't taken apart the latest LED types though..... Too much to do , so little time.
Yes a kind of Z sleeve for tubes!
An idea for 211 tubes?Maybe a another kind of ers: specs seem better.
Copper and nickel in a nylon tissue: it is used in bio housing.
Much much cheaper.
Edits: 04/01/15
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