YORKVILLE DynaBass 800H Service Manual

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YORKVILLE DynaBass 800H Service Manual Manual pdf 20 page image

1SERVICE BULLETINPreamp Tube ReplacementProducts Affected: xs400, xs400t, xs400h, xs800h, theDynaBass Series (the 400, 400t, 400h and 800h).In order to maintain consistent audio sound quality and performance replacepreamplifier tubes in the xs400, xs400t, xs400h, xs800h, the DynaBass Series(400, 400t, 400h and 800h) with Yorkville specified and sorted 12AX7 tubes(Yorkville Sound part number “12AX7SORTED”).The specified tubes are chosen for their combined attributes of low noise,high gain and no microphonic feedback. The following chart demonstrates asampling of 1000 tubes tested and the percentage deemed acceptable.Distribution of 12AX7 Gain Measurement [N = 1000]Tubes used in the DynaBass 400, 800H, XS400 and XS800Hare extracted from the upper quartile of the tube populationw w w . y o r k v i l l e . c o mREAL Gear.REAL People.Yorkville Sound550 Granite CourtPickering, OntarioL1W-3Y8 CANADACanadaVoice: (905) 837-8481Fax: (905) 837-8746Yorkville Sound Inc.4625 Witmer Industrial EstateNiagara Falls, New York14305 USAU.S.A.Voice: (716) 297-2920Fax: (716) 297-3689