Quad 303, DC voltage on speaker output question

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Hi. I have a Quad 33/303 setup that I have inherited and which hasn't been used for quite a while. Before I risk any s/hand amplifier on my speakers, I usually check for DC voltage on the speaker output of the power amp before connecting to the speakers themselves. I would usually expect to see a number in the low mV but when checking the 303 I am getting a figure of about 10 - 15V on switch on, which slowly descends to about 750mV after a minute or so. I am concerned about this as I don't want to do any damage to the speakers and I wonder if anyone with experience of the 33/303 can advise what V/mV figure I should expect with no speaker attached?

Thanks.

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Topic - Quad 303, DC voltage on speaker output question - copydex 01:02:36 07/29/15 (7)

RE: Quad 303, DC voltage on speaker output question - copydex 10:41:31 07/31/15 (2)

RE: Quad 303, DC voltage on speaker output question - bare 19:19:23 08/03/15 (1)

RE: Quad 303, DC voltage on speaker output question - longtimequadowner 10:06:27 08/04/15 (0)

RE: Quad 303, DC voltage on speaker output question - fredtr 12:39:32 07/30/15 (0)

RE: Quad 303, DC voltage on speaker output question - Banat 03:34:49 07/29/15 (2)

RE: Quad 303, DC voltage on speaker output question - copydex 08:03:17 07/30/15 (1)

RE: Quad 303, DC voltage on speaker output question - longtimequadowner 09:33:42 07/30/15 (0)

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