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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Thanks, Ray, I didn't realize the rectifier tube.... posted by radiance on December 5, 2006 at 11:23:49:
...As you surely must know, the 5V4 isn't the stock AA151 rectifier tube. It's the 5AR4. Unless of course you're using one of those large envelope Phillips ECG 5V4s that are really 5AR4s. The point here is that although both are indirectly heated, the 5V4 warms up in about 11 sec, same as most other IDH tubes thus limited "protection". OTOH, the 5AR4 (even Russian and Chinese) takes 15-20 sec to reach full operation so B+ is truly delayed...not that there is any real benefit to other tubes for this effect.Which causes me to wonder why there is continuing concern about cathode stripping? If one looks to past literature, the primary benefit of IDH rectifiers touted back then was the cost savings in PS caps, not cathode stripping. The delayed B+ allowed electolytic caps and other voltage /cost sensitive parts to be rated at lower voltages, thus lower costs. I've never seen any evidence of tube mfgrs having developed the IDH rec for consumer use for anything other than this...but I haven't seen everything either. Transmitting tubes are another story.
Another thought: If we have concerns about cathode stripping on our beloved signal tubes, why aren't we concerned about cathode stripping of the rectifier?
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Follow Ups
- 5V4 vs 5AR4 and cathode stripping... - Steve O 18:42:52 12/05/06 (0)
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