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Old 7th January 2009, 11:03 AM   #11
juluska is offline juluska  Ukraine
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No es clase A, o al menos no clase A pura simplemente por utilizar transistores de potencia complementarios MJ15003 y MJ15004. Para clase A pura tendrías que ir a esquemas asimétricos del tipo Zen de Nelson Pass con muy baja potencia y elevadísimos consumos. Si de verdad fueran 100 w en clase A necesitaría un toroidal de más de 23kg,

http://www.passdiy.com/pdf/articles/powersupply.pdf

Supongo que, como mi viejo musical fidelity A1 debe estar un poco subido de amperaje en la polarización, con lo cual una pequeña parte de sería clase A. Mide el amperaje en los transistores de potencia, uno de ellos debería marcar algo en reposo y creo que así podrías calcular hasta dónde es clase A, es lo que hacen en esta página:

http://www.mhennessy1.f9.co.uk/mf_a1/technical.htm
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Old 7th January 2009, 11:11 AM   #12
juluska is offline juluska  Ukraine
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esos transistores los tienes en rs:

http://es.rs-online.com/web/search/s...hTerm=MJL3281A

pero no sé si suponen una mejora de sonido, los que llevan aguantan mayores temperaturas, amperajes y potencia, yo los he usado para actualizar el MF A1 y van muy bien.
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Old 7th January 2009, 11:35 AM   #13
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Caballero muy graciosamente,

Class A has no bearing to either Single Ended or Push Pull output stages, and Pure Class A is merely an annotation that refers to the level of Class A biasing.
Biasing that power amp to the full 100W in Class A would be a piece of cake with a fan and a high performance heat sink, even at a Die temperature that is considered the standard.
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Old 8th January 2009, 09:05 PM   #14
widi is offline widi  Spain
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Thank you all for your help.
Regards
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