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I agree with Jeff

Looks to me like Jeff is correct; C1L and C2L couple the drivers to the grids of the output tubes, i.e., they block DC on the plates of the drivers from affecting the bias on the output tube grids, which is derived from a separate circuit. Your choice of those caps will affect the sound quality. If you want "warmth" go PIO. If you want good sounding but "warm" resistors, consider Rikens; I think they are carbon or carbon film types.

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