I have an amp with a similar board. ZD10A and ZD12A are 1N4737s. ZD9 and ZD11 are 1N4740s. The anodes are directly connected for each pair.
The connections to the main board are color coded to the legs of the diodes in the second photo.
The connections to the main board are color coded to the legs of the diodes in the second photo.
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