AC50 serial number 1354 - preamp

Last third of 1964 - very early large box.

Continued from the first picture page on . Below, a selection of details of the preamp.

Click as ever on the thumbnails for larger images.

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All mustard capacitors in the preamp have the date code "A4N" = first quarter of 1964.

Date code "BL" = February 1964.

The bias voltage potentiometer accessible between the two filter caps.

Date code "BL" = February 1964.

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Date code "VF" = June 1964 on the Welwyn cement resistor. The resistor is there to give some protection in the event of a speaker cabinet going open circuit, or a complete lack altogether of load (ie. a speaker cab. not connected).

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On to the power amp.