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in terms of how 'off' the quipment needs to be? I had a pair of Siemens 5814as that I wasn't happy with in my CD player so I decided to go back to the Mullard CV4003s. I had the cover off so the player was only on standby when I swapped the tubes out. Is this likely to have caused any problems, because I swear the sound has deteriorated since I had the Mullards in before? It's quite subtle, but things seems to sound flatter, and there isn't anything else that I've changed. Or, could the advanced stages of audio-nervosa now be setting in, wherein almost nothing will please me any more and all music will sound 'off' and irritating in one way or another?
Edits: 06/27/08Follow Ups:
I pulled tubes (not power tubes- never please) in active circuits with zero volume and not caused harm to any tube or device over a period of 40 years. Mind you, not recommended. One very remote possibility is of inserting/removing tubes in an active circuit created an internal arc in a tube such as blowing a hole in a small section of a grid wire. But, both tubes at the same time? That is extremely unlikely in a small signal tube circuit. And, for the most part small signal tubes operate at rather low voltages in a circuit 'snubbed' with a plate resistor. Not the best circuit for creating an arc in a tube in-between internal elements. So, I doubt I have been blessed with 'lady luck' over 40 years. Trying that trick with power tubes is another matter.
Other factors come into play here. First, the background noise at different times in your environment causes small differences in perception of what you are hearing. Are you remembering the best CD youu heard at 1am in the morning? Changes in your electrical power distribution system can actually change the sonics ever so slightly. Electrical distribution power is usually cleaner late at night. Temperature & even humidity ever so slightly can alter the sound. As for the CD player, perhaps it is time to clean the unit.
But, it was a good way to short something out, hot-swapping.
"He (R.M. Nixon) was a foul caricature of himself, a man with no soul, no inner convictions, with the integrity of a hyena, and the style of a poison toad." H. S. Thompson
Just a final question on this, I can live with audio-nervisa but don't want paranoia to boot. If something had shorted then would the thing not be working now? Or, is it possible for a short to have only the slightest effect on the sound being produced (now I know that is paranoia)?
Cheers
...
Antonio Melo Ribeiro
What is 'the schema'? A tube tester? Voltmeter? Sorry, I'm without a clue on component DIY. Are you suggesting that there may indeed be a problem, even though the change to the sound is seemingly so subtle?
If you like to live dangerously, after all it is only a player, dont take it to someone who knows how to check it... ;)Antonio Melo Ribeiro
Soooo, I should have it checked? Even thugh it's working now something might blow in the near future because of the manner of the tube-change? I don't really get it, there seems to be a fair few cryptic responses on this thread (or maybe it's me), but I will take it someone who knows how to check it. Anything he should be looking for in particular because he's likely to say "it plays music, so what's the problem?"
Relax and enjoy your music.
Its not like running a motor without lubrication.
It would be easy to short one of the tube's pins, especially if your sockets have a metal post in the center.
I've hot swapped quite a few 6992s in an amplifier when the manufacturer said it was OK to do. It used "global-feedback". Retubing it just required minimising the voltage difference on the last dual triode.
And, remember that you probably have at least 100 volts that can wake you up if you slip! The bite won't be bad. But, you can develop a habit of not pulling your AC cord before changing tubes, and some day, do that with an output tube with more than 100 volts on it.
Bob
"He (R.M. Nixon) was a foul caricature of himself, a man with no soul, no inner convictions, with the integrity of a hyena, and the style of a poison toad." H. S. Thompson
If the tubes are not ON in stand-by, then you should be OK...
Antonio Melo Ribeiro
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Sounds ominous... is it?
As to why in the world would you do that? When you inserted the new tube did it go into standby mode also.Did it light up automatically?
I'm sorry but I just can't understand the reasoning behind this action.
I had my CD player on the rack without the cover on because it can't be taken off/put back on with it in place. This allowed for a quick comparison between tubes. However, when it came to swapping out the Siemens to put the Mullards back in I only pressed the standby button, so one led remained on, instead of the 'full power' switch. I just forgot. The tubes aren't lit up or anything when the CD player is in standby so I guess I'm wondering whether any current goes through them at this time. If there is a slight current, would pulling them out likely damage them and, if so, can the damage only be ever so slight so as to only affect the soundstage and upper frequencies of the music (in an ever so subtle way)? I would think that any damage would have a far more dramatic effect, i.e. the thing stops working.
No current flows in a tube that is not "lit up".
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Nooooooooo!!!!!!!!!!!!!!
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