hi all, i got a present from a good friend, its a guyatone funky box, its uses a 12ax7 tube, but i cant power it, im using a voodoo lab power supply but the pedal at 12V DC works but the output its so poor, the pedal have a 12V DC mark up and dowm, but its rare a pedal that uses a tube to have DC, could it be 12 AC??
Quote from: copachino on December 29, 2014, 04:58:44 PM
hi all, i got a present from a good friend, its a guyatone funky box, its uses a 12ax7 tube, but i cant power it, im using a voodoo lab power supply but the pedal at 12V DC works but the output its so poor, the pedal have a 12V DC mark up and dowm, but its rare a pedal that uses a tube to have DC, could it be 12 AC??
Huh? Do you mean the pedal has a mark like this?
(http://flylib.com/books/4/261/1/html/2/files/fig74_01.jpeg)
12V AC for sure.
First search result on google:
http://guyatone.com/Pr_Kb_Fbx.php (http://guyatone.com/Pr_Kb_Fbx.php)
thats AC mark, the mark on the pedal its DC, but look at he bottom plate its says use an AC adapter
(https://lh6.googleusercontent.com/-D8V0pMiCXC8/VKGOtFHWZWI/AAAAAAAAAF4/PigYPJJraM4/w433-h577-no/IMG_20141229_112459%5B1%5D.jpg)
but, i see inside there its a diode in the input of power, the same way we use for pedal on DC... so im kind of unsure, even if the say its AC on their page
According to this
http://www.mrjackguitars.com/media/power_consumption.pdf (http://www.mrjackguitars.com/media/power_consumption.pdf)
Guyatone FB-X Funky Box uses 12V DC 160mA
dont mind this, i had not had coffee.
I think the newer "Flip" series is AC.
Cody
Somewhat confusingly, DC supplies are referred to as AC adaptors as they adapt the AC in to DC.
So yes it's 12V DC as self destroyer states.
From the picture above, it is definitely a DC power input.
AC does not have polarity on the connector tips ::)
The supplied AC to DC adaptor is supposed to be at 200mA. Could it be the current limit on your power supply that's causing the problem?
Quote from: RobA on December 29, 2014, 06:57:14 PM
The supplied AC to DC adaptor is supposed to be at 200mA. Could it be the current limit on your power supply that's causing the problem?
i have tried a 1500ma power supply and syill the same, low output and the tube doesnt bright as it should
Tried replacing the tube?
4 different tubes, even lower gain tubes but no luck still the same noise, the only i have not tried its an AC supply
Don't put an AC supply in, you'll kill it.
Clearly needs debugging.
Quote from: Scruffie on December 29, 2014, 09:39:52 PM
Don't put an AC supply in, you'll kill it.
Clearly needs debugging.
i already did.. and kill my supply, padal its ok... i need to debug this guy
Well that probably damaged all the active components in it... opamps, transistors, possibly electros too are likely dead or damaged now.
nop, the pedal its working as it was working before, i get the filter but at really low output, i dont see any damage on the circuit also, probably my firend did this and damage something before me