TR-4

[Gary Carter]

        When I still had by Drake B line about three or four years ago I was
able to order original blue filters directly from Drake online. The
exact replacements were a nice dark blue.

        Gary Carter - WA4IAM

Don Buska wrote:
> Joe,
>
> A low cost method is to visit your local office supply store and check out the index
> card cover area.  They make these neat packs of multicolor milar film covers that
> slide over 4X6 index cards.  Doubled up, which is easy since these covers are already
> formed to cover both sides of the index card, it provides a very nice blue for the
> Drakes.  Or you can do what I did and choose a different color.  I use yellow!  My 4C
> line looks great with yellow filters and considering that for an incandecent lamp they
> naturally lean more toward the red end of the frequency spectrum.  That's why the blue
> filters look green after awhile.  They are still blue just not blue enough to filter
> out the red end of the spectrum from the lamps filaments.
>
> 73
>
> Don N9OO
>
>
>
> On Mon, 23 Jun 2003 19:45:38 -0700, k7mks wrote:
>
>
>>Am restoring a TR-4 and wish to replace the blue plastic filters for the meters and
>
> calibrated dial, both which are faded.  Any ideas for a source of this material?
> Finals need to be replaced - does anyone have 3 spares lying around looking for a good
> new home?  Please reply direct.  Many thanks, Joe k7mks
>
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