Bassulike66 Posted June 24, 2010 Share Posted June 24, 2010 I'll keep this as breif as possible..... Hartke 3500 amp, 4.5XL cab, 115XL cab, all at 8 ohms. Anyway, last night i was only running through the 4.5 cab, volume level 2... I was trying out an OBD 3 pedal, connected via a Korg tuner, dbx parametric equaliser and TC comp/gate (all rack mount). When i pressed the pedal i had a serious amount of hiss..ok, i half expected this! Tried to adjust the TC unit to cut down on the hiss....No such luck! Dissconected all other units and connected bass directly to amp. Checked all leads, and batts in bass....still got the hissing and quite a severe loss of power! I have turned the amp upto 9 and it doesn't even rattle the windows...lol. Tried the amp solely through the 115 cab and it acts exactly the same. So, im thinking amp and not cabs dead... Cant really hook it up and cross reference it with anything else until next Monday's rehearsal.. Also had a quick look inside the amp, could'nt see any obvious schorch marks or blown components,...valve also looked intact. Didn't have time to check for dry joints. Any pointers would be greatly appreciated....... Quote Link to comment Share on other sites More sharing options...
DHA Posted June 26, 2010 Share Posted June 26, 2010 [quote name='Bassulike66' post='876196' date='Jun 24 2010, 10:16 AM']I'll keep this as breif as possible..... Hartke 3500 amp, 4.5XL cab, 115XL cab, all at 8 ohms. Anyway, last night i was only running through the 4.5 cab, volume level 2... I was trying out an OBD 3 pedal, connected via a Korg tuner, dbx parametric equaliser and TC comp/gate (all rack mount). When i pressed the pedal i had a serious amount of hiss..ok, i half expected this! Tried to adjust the TC unit to cut down on the hiss....No such luck! Dissconected all other units and connected bass directly to amp. Checked all leads, and batts in bass....still got the hissing and quite a severe loss of power! I have turned the amp upto 9 and it doesn't even rattle the windows...lol. Tried the amp solely through the 115 cab and it acts exactly the same. So, im thinking amp and not cabs dead... Cant really hook it up and cross reference it with anything else until next Monday's rehearsal.. Also had a quick look inside the amp, could'nt see any obvious schorch marks or blown components,...valve also looked intact. Didn't have time to check for dry joints. Any pointers would be greatly appreciated.......[/quote] impossible to debug these things by email, but I was the tech looking at this I would check out the amps pre-amp stage first as it may have been damaged be a duff pedal. Is there an FX loop? If so then try plugging into the return and see if there is still hiss and low level, this would mean a power stage issue if still duff or pre-amp if working. Quote Link to comment Share on other sites More sharing options...
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