[BC] Cassette deck maintenance

[Steve Lewis]

For this to be of any use, the recording of the tone would have to be made
on a known-good deck (running the correct 1 7/8 IPS) then played back on the
"testing" playback unit to compare the playback tone to the oscillator (or
an oscillator) set to the same frequency as was recorded.

If you record at 2 IPS and playback at 2 IPS, the tones will match on the
scope and will have accomplished nothing.

-----O'rig Msg-----

No, you are NOT comparing the record to the playback-you are comparing the
OSCILLATOR to the playback! Let's say the recorder is running slow-it would
record the tone slow and pay it back slow-COMPARED TO THE OSCILLATOR! Same
thing if it was running fast. You are using the OSCILLATOR as your
standard-and as long as that standard isn't changed during and after the
recording, the standard can be ANY frequency!