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Those Blackcat "modulators" have blown up more than one amplifier they have been placed in front of due to self oscillations. The idea of placing the output tank coil in the same tight compartment as the grid input circuit without any shielding is just a problem waiting to happen. You may want to check and see if there is a DC shorting choke across the output. If not, the DC blocking cap is being charged through the gate circuit of the FET amp rather than a direct shunt to ground.

[QUOTE="Shockwave, post: 727003, member: 10882"] Those Blackcat "modulators" have blown up more than one amplifier they have been placed in front of due to self oscillations. The idea of placing the output tank coil in the same tight compartment as the grid input circuit without any shielding is just a problem waiting to happen. You may want to check and see if there is a DC shorting choke across the output. If not, the DC blocking cap is being charged through the gate circuit of the FET amp rather than a direct shunt to ground. [/QUOTE]

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