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I compared the components inside the amps but I haven't found any differences. If you look the schematics of 2100-65 chassis , in the matter of fact, none of them is correct for this head.
This makes me think that has been produced in the period of migration from tube PI to opamp PI.
There is a difference between their knobs: numbers on the knobs in the HD130 are bold-like respect the sixty-five's ones.
I'm quite sure that HD130 is older than the sixty-five. ) It has a preamp board rev BB-1 B, with LM307H opamps (metal can package), and the "filter circuit" (as mentioned in the schematic) BUT has no 12AX7, so the bias circuit in preamp board is unused and the two EL34 are biased by transistors.
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