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Old 17th February 2013, 05:30 PM   #1
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Join Date: Mar 2011
Default Help me,Art Audio Concerto

Newbe-I have a MK1 Concerto in need of help!A circuit would be good.The amp has some boutique components fitted by former owners and my have the wrong valve line up.I say this because the front end valve Ecc82 has a very large anode load resistor 390k. What is the value and rating of the 4 psu caps and the filter resistor? The cathode bias resistors on the 6550's are 500R is this correct.
thanks, KT.
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Old 17th February 2013, 07:49 PM   #2
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JonSnell Electronic's Avatar
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Could you let us know what a MK1 Concerto is. Make model etc?
Bearing in mind I am in the UK.
Thank you
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Old 17th February 2013, 10:09 PM   #3
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Join Date: Mar 2011
Oops,sorry.Its an Art Audio conterto. PP6550 power amp.
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Old 18th February 2013, 03:11 AM   #4
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Join Date: Jun 2011
that doesn't seem too much out of line for an amp that has a high B+

like 425-500V ish.
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