Tubes Asylum

Unless you are 1kV or more, the tubes could care less about the speed of first B+

172.11.32.65

Chip647

A

In Reply to: RE: 5R4 GY coke bottle and 5R4 GYA and other 5R4 posted by John PA on November 27, 2024 at 11:17:48

Ripping the electrons off the cathode of a cold tube is a very high voltage problem. Relax. Audio tubes at 500v are not hurt this way. It was a marketing thing to extract maximum $$$ from someone hawking superraremetal5A44forevertubes.

however, don't leave tube heater on with no B+ for hours on end which can cause cathode poisoning, but that is the opposite problem.

Follow Ups:

Didn't the old 45 juke box players leave the tube heated. . . - John PA 11:49:42 12/02/24 (3)
so they were ready to go once the dime was put in?

iBasso DX300MAX Ti. Focal Utopia and Stellia. iBasso SR2. Mr. Speakers, Ether II, Voce stats. Manley, Absolute headphone amp. LTA MZ3, Z10e electrostatic amp. Many other headphones, amps, cables etc.
- I think they just stay 100% on until you turn them off. nt - Tre' 12:52:47 12/02/24 (1)
  .
  Have Fun and Enjoy the Music
  "Still Working the Problem"
  - Not necessarily - Steve O 15:33:26 12/02/24 (0)
    I worked on a couple of jukebox amps of the 78 and 45 era. Both amps powered down after play was complete. The 78 amp used 100% directly heated tubes and was ready to go from a cold start in a few seconds. The later amp used a directly heated rectifier with indirect 6.3V tubes everywhere else. The heater circuit was dual voltage ~ 10V at cold start which slammed everything up to temp in a few seconds. When the finals (PP 6L6G) began to conduct, a DC relay in the cathode circuit would energize and tap down to 6.3V. Kinda brute force but effective. Tubes were more expendable then.
- Back then, a dime could buy a new one! (nt) - Triode_Kingdom 12:40:16 12/02/24 (0)
  nada aqui

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