Hi dears new here, soliciting yours help & assistance on a Hartke HA2000 bass amp. I'm servicing.
1)I has replaced the two broken input jacks (with same originals), the IC101 (with same NJM2068DD) and the Pwr Supply Regulators 7818/7918
which I substituted by the 7815/7915 because same numbers are Not found.
2)The amp is now working & sounding almost well BUT except by the PASSIVE Tube Volume input.
3)When a signal is in to the ACTIVE input it sounds good with Solid State & Tube Volume controls at all levels from low to high.
4)with PASSIVE in signal, only with the Solid State Volume sounds good at all levels, but with Tube Volume heards a distortion like cracking
from low to up.
5)I has checked and replaced the R101 (68Kohm), the 12AX7WA valve and another time the IC101 (NJM2068DD), but with no any good
results, keeps same failure.
Have anyone some suggestions, directions or knows for some modification or upgrade to fix on???, can be the 7818/7918 substitution by the
7815/7915 causing this distortion on the PASSIVE w/Tube Volume only???
Thanks and will waiting.
1)I has replaced the two broken input jacks (with same originals), the IC101 (with same NJM2068DD) and the Pwr Supply Regulators 7818/7918
which I substituted by the 7815/7915 because same numbers are Not found.
2)The amp is now working & sounding almost well BUT except by the PASSIVE Tube Volume input.
3)When a signal is in to the ACTIVE input it sounds good with Solid State & Tube Volume controls at all levels from low to high.
4)with PASSIVE in signal, only with the Solid State Volume sounds good at all levels, but with Tube Volume heards a distortion like cracking
from low to up.
5)I has checked and replaced the R101 (68Kohm), the 12AX7WA valve and another time the IC101 (NJM2068DD), but with no any good
results, keeps same failure.
Have anyone some suggestions, directions or knows for some modification or upgrade to fix on???, can be the 7818/7918 substitution by the
7815/7915 causing this distortion on the PASSIVE w/Tube Volume only???
Thanks and will waiting.
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