From: "hahi@telia.com [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Friday, March 11, 2016 5:25:22 PM
Subject: Re: [TekScopes] Blue Filter P/Ns for 24xx Scopes

There is general confusion regarding the part number for these filters.

There were four types of CRT filters for 2400's.

378-0199-00 replaced by 378-0199-03
378-0199-01 replaced by 378-0199-04
378-0199-02 replaced by 378-0199-05
The initial three (-00 thru -02) were made of polycarbonate and the
replacements were made
of acrylyc which made them more scratch resistant and they could be cleaned
using
pure alcohol. They were all blue but only the first ones (-00/-03) are for
standard instruments
while the others (-01/-04 & -02/-05) are for OPT 05 (TV Trigger) instruments.
I don't know for
sure but a qualified guess is that they have a Video graticule possibly NTSC
and PAL.

378-0208-00, clear made of polycarbonate, no replacement

Hope this cleared some of the confusion.

/Håkan

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