RCA 5751W1 vacuum tube - rare 5751 variant - black plates - new old stock - vintage Radio Corporation of America tube
New Old Stock RCA 5751W1, black plate vacuum tube. Original box is in fair condition. Tube is near mint - just a little branding wear. Pins are straight and clean. Perfect glass. Full getter. Tested on a Hickok 118A tube tester.
I often get asked what's the difference between a 12AX7 and a 5751.
The RCA HB3 (October 1953) says that the 5751 is a premium type "Intended for applications where dependable performance under shock and vibration are paramount."
While electrically similar they are not identical. The 5751 takes marginally higher filament power. If you look at the data sheets it seems that the 5751 has lower gm, but you have to watch out; The test conditions for the 12AX7A are Eb=250. Ec=-2, while 5751 are Eb 250, Ec=-3.
I calculated gm for both tubes from their respective graphs at Eb=250, Ec=-2
12AX7A = 1550 μmhos
5751 = 1500 μmhos
Not much of a difference at least at this operating point.
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Priority Mail: 3 business days
First Class Package: 4-5 business days
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