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MingDa 845C monoblocks

Could someone familiar with these amps please comment - in terms intelligible to the totally ignorant - on the following:

a) Which - if any - of the stock chinese 845, 6NS7, 12AU7, & 12AX7 is there an audible benefit in replacing, and with what?

b) Does anyone have a link to a circuit diagram?

c) Is it necessary to check the bias, and if so, how is it done?

Very many thanks.


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Topic - MingDa 845C monoblocks - GlassDarkly 08:14:56 03/16/07 (1)

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