Tubes Made
What ever happened to tubes on chips?

As I recall the benefits were that tubes could be made smaller than pn junctions and the power requirement was much lower. The problem was that the anode being only a few atoms in size was quickly destroyed by the collision of electrons. Anybody have an update?

Economics is what drives electronics. PN is cheaper to make so that is what they will use it until there is something cheaper. The nature of engineering.

Usa Made TUBE Power Amp CHASSIS, POWDERCOAT, OAK CAB $126.39

5963 / 12AU7 US Made Audio Preamp Tube FREE SHIP US48 $12.95

6AU6 US Made Audio /RF/IF Tube FREE SHIP US 48 $12.95

TUBES – 3 HP 5963 matching tube 12AU7A RCA-made long pl $24.99

4 Amperex Bugle Boy ECC88 6DJ8 Tubes – Made in HOLLAND $9.99

6LX6 US Made RF/Audio Pwr Amp Tube NIB FREE SHIP US 48 $29.95

3 Telefunken ECC88 6DJ8 Audio Tubes – Made in W Germany $16.50

6KN6 US Made RF/Audio Power Amp Tube FREE SHIP US 48 $24.95

Pair Mullard ECC83 12AX7 Audio Tubes-Made in GT BRITAIN $57.90

TUBES – 2 HP 5963 matching tube 12AU7A RCA-made long pl $14.99

3B24 High Voltage US Made Rectifier Tube FREE SHIP US48 $24.95

3B28 High Voltage US Made Rectifier Tube, Collins TXR $24.95

3 Telefunken ECC83 12AX7 Audio Tubes -Made in W Germany $91.00

6AW8 A US Made Audio and RF Tube Juke Box FREESHIPUS48 $12.95

Wizard 6J5GT 6J5 GT Metal Base tube, Sylvania made? $4.99

6Z8 = 6SJ7 equivalent Electron Tubes russian made $1.80

6Z7 = 6J7 equivalent electron tubes russian made $1.00

set of 2 Hivac GC10B BAIRD-ATOMIC tubes made in ENGLAND $65.00

Triad (made by GE) 3AL5 tube 1963 NOS/NIB $3.00

Triad (made by GE) 35L6GT tube mid ’60s NOS/NIB $4.00

4EH7 PHILCO COOL CHASSIS MADE IN JAPAN TUBE -lot #23 $5.95

Triad (made by GE) 6AX4GT tube mid ’60s NOS/NIB $3.00

CALVERTRON MADE IN ENGLAND # 6J5 G/6J5G VACUUM TUBE $29.95

Triad (made by GE) 2CY5 tube 1963 NOS/NIB $3.00

1950’s Pair USA Made GE 6SN7 Audio Stereo Amp Tubes $19.00

One Tested Nos Vacuum Tube 6AM6 EF91 UK made $4.29

4 Telefunken Tubes ECC 85 – EF 86 MADE IN GERMANY $15.00

International ECC82/12AU7 Tube GE Made Used Tests Good $19.97

Amperex 6SN7 gtb made in the Usa Tubes -lot of 3 $18.95

1 Vintage Nos ITT 6JH8 Tube Made IN USA $7.99

Small solar cells are set Researchers have shown small solar cells only billionths of a meter in diameter that can repair themselves, extending their life. Making use of cell protein plant machinery, converting sunlight into electrical charges they can do the job.