🚀 go-pugleaf

A couple of people have been asking about the availibility of these.
One supplier is TEAC corporation - the same people who make tapedecks
in the domestic to "home studio" range. the azimuth tape is a full track
6.3khz test tone @ -10dB below dolby ref level (which is, in the case of
cassette tapes, 200 nW/m i think)
TEAC also make
Dolby reference tapes (1K @ 0dB)
Wow 'n flutter tapes  (3K @ -10db)
Height alignment tapes (1K @ -10, recorded 4 track, not full track)
Freq response tapes (An assortment of useful tones)
Teac are in California , and advertise in mags like "The Mix"
Doing it :
Never make your own test tape on someones "good" deck - it will never be
right, and will cause untold greif when using your tapes on other decks.
Clean and degauss deck thoroughly BEFORE putting in your (expensive)test
tape - also ensure record protect tabs are knocked out and the protect
mechanism is functional - else you may record over your standard tape -
a ghastly experience , even more easy to do on reel/reels , but thats
another story.
Using scope in 2 channel X/Y mode, both channels set for 100mv/cm
adjust the screw with the spring under it (dont touch other one), for
a bottomleft -> topright line pattern, with minimum ovality and maximum
amplitude - if the head & electronics are perfect, you will get a 45deg
line - go for the maximum / and minimum O. There will be several false 
nodes on either side of optimum - these are multiples if one wavelength 
out. Only one maxima occurs. Expect the pattern to wobble - just go for
the best average.
cheers,
        Mike.
(ps seal screw with nail polish - green if you prefer CDs :-)

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mike_d@tfsquad.mn.org (mike diack)
The Firing Squad BBS, public access Usenet mail and news.  +1 612 291 2632
Saint Paul, Minnesota