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Blue Filter P/Ns for 24xx Scopes


n4buq
 

Does anyone know what the differences are for part number 378-0199-00 vs 378-0199-03? The manual I have shows -00 as the correct part number for a 2445 and am wondering if the -03 will also fit (as well as whether it's a plain blue without any markings, etc.). Is it possible these are identical but given new numbers for later models?

I know the -04 is a specially-marked filter but not sure about other suffixes.

Thanks,
Barry - N4BUQ


 

There is general confusion regarding the part number for these filters.  Some sellers identify 378-0199-00 as being a clear filter and others identify it as being blue.  So I checked the Service Manuals.
The Service Manual for the 2465 calls out 378-0199-00 as a blue filter.The Service Manual for the 2465A calls out 378-0199-03 as a blue filter. The Service Manual for the 2465B calls out 378-0199-03 as a blue filter.  
My opinion is that either 378-0199-00 or 378-0199-03 will fit.  But double check the color because sellers, especially on eBay, have confused whether these are blue in color or clear.
From: "Barry n4buq@knology.net [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Friday, March 11, 2016 10:17 AM
Subject: [TekScopes] Blue Filter P/Ns for 24xx Scopes

  Does anyone know what the differences are for part number 378-0199-00 vs 378-0199-03? The manual I have shows -00 as the correct part number for a 2445 and am wondering if the -03 will also fit (as well as whether it's a plain blue without any markings, etc.). Is it possible these are identical but given new numbers for later models?

I know the -04 is a specially-marked filter but not sure about other suffixes.

Thanks,
Barry - N4BUQ
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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


n4buq
 

Yes, Håkan. Exactly what I was looking for.

Thanks!
Barry - N4BUQ

----- Original Message -----
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

[Non-text portions of this message have been removed]