Question about Marshall JVM410C 100 Watts Valve Guitar Combo

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My brand new Marshall JVM410C 100 watt combo gets very hot. Is this normal?

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"Very" is relative... yes they do get warm but nothing you should not be able to hold your hand for extended period.

The amps are probably only 30% efficient overall, and the rest comes out as heat... it has to go somewhere, so the case must get hotter than the surrounding air to get rid of the energy.

Posted on Sep 13, 2010

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This means the tubes need to be biased properly. You need to get it to someone who knows what they are doing, ie a good amp tech, not GC. The voltages here are dangerous.

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Just because the voves are lit doesn't mean there is the high voltage power to the valves.

ALSO the smaller valves have TWO heaters in them and if one half has burned out that would cause the symptom. Check if the smaller 12AX7/12AT7 types all have two heaters burning. Verify that the standby switch has not gotten bumped off.

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Given the symptoms you have, the following possibilities are likely:

1. Bad jacks or the switch contacts on them, especially one for power amp input or insert.

2. Bad solder joints... very often where volume controls attach to the circuit board.

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The schematics I found show SEVERAL fuses on the secondary side of the power transformer. I suspect one or more of those are blown. The fuses include the filament power.

As an electrical engineer I will have to caution you on leaving the amp in standby for extended periods. The high voltage rectifier circuit has NO bleeders in this unit and IF a power line transient occurs while in standby, the filter caps CAN be pumped up over their ratings causing them to fail.

Since you had no heaters lit in the tubes, you better pray that the heater fuses have opened as the only other thing is a failure of the power transformer since the neon pilot light is right across the 120 volt primary connections.

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Before you bring this into a shop, try spraying out all of the controls. Use an electronics switch cleaner that contains a lubricant. Spray into the control and work the control back and forth a number of times to loosen up any dirt inside. Then spray it again.

Let me know if that resolves the problem.

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Good luck, its a sweet little amp!!!

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