Re: Marshall JMD problem
A ssshh type tone in the back ground is normal with increasing gain. Squealing feedback on models 14-16 with high gain settings is to be expected unless your guitar is quite a way away from the speakers. Model 16 is the JVMs high gain channel set to the red gain level. Models 1-4 should be almost noise free though.
Did you engage the noise gate? The noise gate activates by turning the modulation knob above 0. Then you can set the parameters of the noise gate by using mod depth to just shut down the noise without affecting the sustain.
You can down load the JMD manual if you don't have one.
The PI tube might be contributing noise.
Where is the bias set with the new tubes?
Here's some setting to try:
Clean , model 1, gain 8, bass 6.5, mid 7.5, Treble 7, channel vol 9, Reverb 3.
JCM 800 crunch, Model 6, gain 9, bass 9, mid 4, treble 2, channel vol 6, reverb 0
Modded 800 overdrive, Model 10, gain 8, Bass 7.5, mid 5.5, treble 2.5, channel vol 5, reverb 0
Boosted plexi lead, Model 13, gain 6, bass 6.5, mid 4, treble 5, channel volume 4 reverb 0, delay a smidge analog.
Make sure you turn on the FX loop even if you don't use it. Set it to about 2/3 on the knob in the back. This makes the amp 100% tube sounding.
A ssshh type tone in the back ground is normal with increasing gain. Squealing feedback on models 14-16 with high gain settings is to be expected unless your guitar is quite a way away from the speakers. Model 16 is the JVMs high gain channel set to the red gain level. Models 1-4 should be almost noise free though.
Did you engage the noise gate? The noise gate activates by turning the modulation knob above 0. Then you can set the parameters of the noise gate by using mod depth to just shut down the noise without affecting the sustain.
You can down load the JMD manual if you don't have one.
The PI tube might be contributing noise.
Where is the bias set with the new tubes?
Here's some setting to try:
Clean , model 1, gain 8, bass 6.5, mid 7.5, Treble 7, channel vol 9, Reverb 3.
JCM 800 crunch, Model 6, gain 9, bass 9, mid 4, treble 2, channel vol 6, reverb 0
Modded 800 overdrive, Model 10, gain 8, Bass 7.5, mid 5.5, treble 2.5, channel vol 5, reverb 0
Boosted plexi lead, Model 13, gain 6, bass 6.5, mid 4, treble 5, channel volume 4 reverb 0, delay a smidge analog.
Make sure you turn on the FX loop even if you don't use it. Set it to about 2/3 on the knob in the back. This makes the amp 100% tube sounding.
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