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Modular Amps
Egnater / Randall Modular Amps
RM20 schematic needed
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<blockquote data-quote="drunton" data-source="post: 59404" data-attributes="member: 93"><p>I have an RM20 head that seems to have a high voltage supply issue. It blew the high voltage fuse and even after replacing, doesn't seem to be working. The preamp side works fine, I get signal from the effect send, but I can't adjust the bias (it reads 0mV all the time) and I don't see any heater glow from the EL84's or the 12AX7 phase split/invert tube, though at least two of the 12AX7 preamp tubes and module connections are fine since the pre-side is working.</p><p></p><p>If someone has a schematic, it will help me pinpoint potential failure points. I don't see any burned resistors, so it's probably a rectifier or something silicon based, but still having the diagram will surely help.</p><p></p><p>I've seen where Randall won't give them out any more, but there are some posts saying people have received them in the past.</p></blockquote><p></p>
[QUOTE="drunton, post: 59404, member: 93"] I have an RM20 head that seems to have a high voltage supply issue. It blew the high voltage fuse and even after replacing, doesn't seem to be working. The preamp side works fine, I get signal from the effect send, but I can't adjust the bias (it reads 0mV all the time) and I don't see any heater glow from the EL84's or the 12AX7 phase split/invert tube, though at least two of the 12AX7 preamp tubes and module connections are fine since the pre-side is working. If someone has a schematic, it will help me pinpoint potential failure points. I don't see any burned resistors, so it's probably a rectifier or something silicon based, but still having the diagram will surely help. I've seen where Randall won't give them out any more, but there are some posts saying people have received them in the past. [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
RM20 schematic needed
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