417A=5842
http://www.westernelectric.com/spec_sheets/417A.pdf
2C51-5670 para el Xiang-sheng Dac (tomado del sitio de MHDT PARADISEA-Havana)
[b]1st class,[/b]
WE396A (D getter)
WE2C51 (D getter)
Bendix 6385 (toooo expensive)
Tesla 6CC42 (rare but sometimes will show up in the market)
[b]2nd class,[/b]
WE396A/2C51 (O getter)
Tung-sol 2C51 (they invent this tube, 1950s, D getter)
Raytheon CK5670 (1950s, D getter)
RCA 5670 (1950s, D/Plate 2 supporting rod getter)
GE 5670 (3 mica structure, mostly 5 stars tube)
[b]3rd class,[/b] (after 1960s)
GE 5670
RCA 5670
Tung-sol 5670
Sylvania 2C51
Sylvania 5670 (sometimes marked Mullard)
RTC 5670
Philips 2C51
[b]4th class,[/b]
Russian and Chinese 6N3P, -E, -EB, -EV
Tubos compatibles[list][*][list][*]5670[*]2C51[*]396A[*]6385[*]6CC42[*]6854[*]6N3[*]6854[*]CV2575[*]CV4013[*]CV5894[*]CV8247[*]CV2381[/list][/list]