{Collins} Collins filter identification



Folks:

I have two of the Collins 353A-15 accessory filters.  These items plugged
into either the National HRO-60 Receiver first i-f amplifier tube socket or
the Hammarlund SP-400's second i-f tube socket.  The actual number on one
filter is part number 526 9227 011 whereas the part number of the other
filter is 526 9227 00.  They both are F455F15 filters which do not show in
the instruction manual as only 0.8Kc, 1.5Kc, 3.1Kc and 6Kc show.

In checking VK3KCM's web site which lists Collins mechanical filters, I only
see the following:

455   F455E-15    526-9370-00  1.5 @ 6 dB   3.5          E
455   F455E-15S   526-9571-010 1.5 @ 6 dB   18.0         E
455   F455F-15    526-9227-00  1.5 @ 6 dB   3.5          F

455   F455FA-15   526-9495-00  1.5 @ 6 dB   3.5          FA
455   F455H-15    526-9170-00  1.5 @ 6 dB   3.5          H
455   F455J-15    526-9155-00  1.5 @ 6 dB   3.5          J
455   F455K-15    526-9168-00  1.5 @ 6 dB   3.5          K
455   F455Q-6     526-9379-00  1.5 @ 6 dB   3.5          J (short)

455   F455Y-15F   526-9638-010 1.5 @ 6 dB   3.5          Y

As you can see, the F455F15 part number 526 9227 011 is not listed whereas
the 526 9227 00 is.  My question is, does anyone know the difference if any
between the two filters.  Is there a difference?

I  actually have three of these accessory plug in filters.  Two have the 011
part number suffix whereas only one has the 00 suffix.

Another mystery about these filters is they have on the outside cover a
stamp which indicates they were modified on 08/60.  It has to be a factory
stamp.  Then below this on one is the number 058 whereas the other has 263.
Could these be encrypted date codes?  If so, what does the 058 stand for?  I
would assume the 263 stands for February 1963 but it is only a guess.

Perplexing.

73,

Charlie, W0YG..>>


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