[AMPS] 8122 color codes

[Phil Clements]

Don't know what the colors mean, but I have 4 tubes that
are all painted green on the top center of each tube where
the plate connection goes.
GL!
Phil, K5PC

Subject: [AMPS] 8122 color codes


>
> I've not seen this on the list but I have from a reliable source that 2 or 3
> years ago the new production of 8122's are manufactured and sorted by gain
> with red, blue, green, black etc. stickers put on the tube box. Burle did
> this without any fanfare or notice to users and caused me some grief.
>
> I can verify the stickers are on new boxes and I can verify that the gain
> and worse the idle characteristics changed in 1997.  This tube change
> required modifying the screen supply in a Harris TV transmitter that I've
> lived with for 20 years or so.
>
> First, if you use 8122's from 1997 or later production in commercial or
> amateur service you will want to know about this.  Also, if someone on the
> list has knowledge of which "color" most closely matches the original specs
> I'd personally like to know.
>
> Pat, WA4TUK




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