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ms660 · 2nd Mar 2018, 7:36 pm

So far as I can make out it's drawn correctly, either side of center is treble cut by equal amounts but only on side of center gives treble cut and bass boost, the bass boost switches are ganged to the tone control. There's a brief description in the Trader for the 543a which shows a similar circuit although there appears to be a discrepancy with S25, S26 in the description....So far as I can make out.

Lawrence.

2nd Mar 2018, 7:36 pm	#26
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Mullard MAS1764 So far as I can make out it's drawn correctly, either side of center is treble cut by equal amounts but only on side of center gives treble cut and bass boost, the bass boost switches are ganged to the tone control. There's a brief description in the Trader for the 543a which shows a similar circuit although there appears to be a discrepancy with S25, S26 in the description....So far as I can make out. Lawrence.