SOURCE: line 6 spider III 15 watt sound problems
Hi there. Sounds like the power amp IC is shorted. Must replace.
Paul
SOURCE: My Line 6 Spider Amp sound goes out when I plug in
Read this cut and paste and verify compatibility as a first step:
<<<
*FBV is not compatible with Spider II 15 or Spider III 15.
**FBV is only compatible with POD 2.0 units with pedal jacks labelled "FBV Pedal." It is not compatible with older units which have pedal jacks labelled simply "Pedal."
(NOTE: FBV is NOT compatible with Ax212™, Flextone™ I, II or HD, POD® Pro, Bass POD®, Bass POD® Pro and Spider™.)
>>>
Note there are apparently several versions. Check compatibility at this site:
http://line6.com/footcontrollers/fbv.html
SOURCE: What causes your line 6 spider amp to turn on and ...
This MAY be due to overdriving the amp. The single chip amplifiers used in these have thermal protection usually and will cycle on and off if you drive it too hard. This is a tiny amp and is for use as practice and is NOT suitable for heavy use. Most of these use chips like the TDA 2050 and MANY of them have VERY substandard heatsinks and often don't even use thermal conductive grease under the chip.
If you want loud, then you need to step up the size of amp you are using to say a 100 Watt one that is designed to take the power.
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