Several of Q-s about Citation 12 MosFet - Page 2 - diyAudio
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Old 9th December 2006, 01:15 PM   #11
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Why nobody ask about D3? It's very clever to put it there due to bootstrapped VAS.
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Old 9th December 2006, 01:19 PM   #12
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Hi, Wputera,

Apa kabar?

The amp is designed for Vertical mosfet. The threshold is about 3.5-4V.
K1058 is lateral mosfet, the threshold is below 1V. You must modify the Vbe multiplier's resistors (R14 or R15).
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Old 10th December 2006, 11:04 AM   #13
wputera is offline wputera  Indonesia
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Okay Mr. Nelson, i will try to set the bias current. Thank you for your help.

Hai Mr. Lumanauw, kabar saya baik.

Thanks for your help too, I will modify R14 or R15. Should I increase the or decrease the value of R15 (10 k Ohm)? Thank you Gentlemen.

Cheers.
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Old 10th December 2006, 01:19 PM   #14
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Hi, Wputera,

To reduce bias voltage in VBE multiplier, B-C resistor must have less value or B-E resistor have more value. (Perbandingan resistor B-C dan B-E yang dimainkan)
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Old 12th December 2006, 01:42 AM   #15
wputera is offline wputera  Indonesia
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Thank you Mr. Lumanauw. That's will solve my problems with my MF-CITATION 12.

YBU.

CHEERS,
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Old 8th September 2010, 11:03 AM   #16
atcgreg is offline atcgreg  Luxembourg
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Hi all fans of Citation mosfet12 .

I build one, sounds great, but I have a huge problem with HUM when hooked up to a preamp Sony TA E80ES When the amp is not connected to the preamp it is silent.

I have checked all ground connections on the amp seems all ok could it be that the impendance of preamp does not match the amps.

the hum is only when I connect the preamp .
Preamp it self connected to any other monoblok amp has no hum.

Please help!
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Old 14th March 2013, 05:21 PM   #17
nrg2009 is offline nrg2009  United States
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I wonder if anybody offers boards for this amp? It seems like a very rewarding build.
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