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Running raw w/o tubes is not recommended, UNLESS you limit input voltage with a variac.
Reason is, the power supply is non regulated, and dependent on load, the tubes in the set ARE that load, w/o the tubes in the set, the voltage generated can exceed the ratings of the filter electrolytic capacitors and damage them (internal shorts), when you run w/o tubes one must be very careful not to let the bias voltage spike above the rate the capacitors can tolerate, or it can be really bad.
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