Service Bulletin - YORKVILLE xs800h Service Manual
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Also See for xs800h:
- Owner's manual (21 pages) ,
- Service manual (16 pages) ,
- Service manual (16 pages)
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SERVICE BULLETIN
Preamp Tube Replacement
Products Affected: xs400, xs400t, xs400h, xs800h, db400,
db400t, db400h and db800h
In order to maintain consistent audio sound quality and performance replace
preamplifier tubes in the xs400, xs400t, xs400h, xs800h, db400, db400t,
db400h and db800h 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 a
sampling of 1000 tubes tested and the percentage deemed acceptable.
SERVICE-BULLETIN-PC7137-preamp-tubes-00-1v0-eng.pdf
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