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Shuttle 9 - Preamp hiss...

Andysalt01

Andysalt01

Apr 21, 2006
185
192
United Kingdom
gevaudan.bandcamp.com
#1
Hows it going,

Just been doing a bit of home playing, not too loud, and all of a sudden there was a kind of a low background crackle/hiss/weirdness from my cab. :hmm:

I did a bit of investigation, changed the cab, the speakon, removed the effects from infront, muted the amp, disconnected the lead.....it was still there - even muted!!

Playing with the controls on the front, turning the "Volume" right down on the preamp, it disappears. Does anyone know what this means?

It kinda comes and goes for periods, but I'm a bit concerned about my amp!! thanks for any assists, and I know genz cruise round here so anything from agedhorse and the crew would be great.

Thanks!! :help:
 
#4
Sure sounds like a bad tube. The gain controls the drive to the tube and the volume controls the signal level from the tube.

If you need more help troubleshooting, give Scott a call at the factory, he will walk you through it.
 
#7
Mine was simply loose, right out of the box, most likely jarred loose during shipping. I reseated it and it's been perfect since. Yours may have come loose after a year of lugging it around, cab vibration, etc. Reseat it before buying a new tube, although having a spare is never a bad idea.
 
#10
Ok, so just got a new tube, popped the lid, removed the right hand bracket and.......stuck as to what the next step is!? :/

Has anyone lese retubed the shuttle 9? the board on which the tube is mounted feels flimsy and I'm pretty shy in giving it a good yank as i reckon I'll ende up busting the board its on!! Technique, tips or howe to from this stage would be great!!!

Thanks in anticipation, and I'll be sure to post results.

Thanks again
Andy
 
#11
Andysalt01 said:
Ok, so just got a new tube, popped the lid, removed the right hand bracket and.......stuck as to what the next step is!? :/

Has anyone lese retubed the shuttle 9? the board on which the tube is mounted feels flimsy and I'm pretty shy in giving it a good yank as i reckon I'll ende up busting the board its on!! Technique, tips or howe to from this stage would be great!!!

Thanks in anticipation, and I'll be sure to post results.

Thanks again
Andy
Click to expand...

Hold the circuit board with one hand, gently pull the tube out while slightly rocking the tube. When installing, line up the gap in the pins with the socket and reverse the procedure.
 
#13
It appears it was the tube! No hiss having played the new one for a while, crystal clear, no hiss. I am a little surprised as I thought the average preamp tube lasted for ages, but its academic now as all in order.

Thanks to all the replies and assistance, it is very much appreciated. Still on a learning curve with gear, and guess I will be forever and a day!! All part of the fun of it! :)
 
#15
Andysalt01 said:
It appears it was the tube! No hiss having played the new one for a while, crystal clear, no hiss. I am a little surprised as I thought the average preamp tube lasted for ages, but its academic now as all in order.

Thanks to all the replies and assistance, it is very much appreciated. Still on a learning curve with gear, and guess I will be forever and a day!! All part of the fun of it! :)
Click to expand...

Still could have been a loose tube and just needed reseating. A good thing to have a spare anyway. Next time you're in there, try putting the original tube back in just in case it wasn't making good contact. The original tube may still be OK!
 
#16
JxBass said:
Mine was simply loose, right out of the box, most likely jarred loose during shipping. I reseated it and it's been perfect since. Yours may have come loose after a year of lugging it around, cab vibration, etc. Reseat it before buying a new tube, although having a spare is never a bad idea.
Click to expand...

Oldtimer said:
Still could have been a loose tube and just needed reseating. A good thing to have a spare anyway. Next time you're in there, try putting the original tube back in just in case it wasn't making good contact. The original tube may still be OK!
Click to expand...

+1.
 
#18
Tubes in general are lower reliability than transistors and because they are electromechanical, noises and variable performance is sadly not uncommon. It's not an amp problem, it's a tube problem and all manufacturers struggle (or should struggle) to obtain the highest possible reliability through forgiving designs, thorough testing and good tube manufacturer relations. Even then, some tubes will fail.
 

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