[Test-Equipment] Tektronix L-20

[Mike L]

Hi Guys,
Looking for basic info (Ops/Cal) for the L-20 plug-in, 0.01 - 4gHz,marked 
"Spectra Pulse Analyzer, Tektronix, Portland,OR" for 547 scope.
Not known by Tek UK ??
Not known by my usual sources who have offered the 1L-20, which is very 
different.
Any leads appreciated.

Mike L
S.Wales
UK