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In Reply to: RE: 6 volt rectifier tubes posted by PakProtector on October 09, 2020 at 11:22:19
Thanks, it would seem that 6by5 are abundant and inexpensive. They are rated for 175ma and the circuit I have in mind draws 150ma. Should work don't you think?
Follow Ups:
Look closely at the 6BY5 datasheet. That 175 mA. is per diode.
If all you need is 150 mA., the 6CA4/EZ81 will do the job for you. That Noval type IS the "little brother" of the 5AR4/GZ34, including tolerance of comparatively large 1st filter capacitors.
Eli D.
What about long term reliability for a rectifier run at maximum rating? In a SE circuit there is a more or less constant current draw, and although there are actually new production tubes available I am not crazy about the idea of replacing a rectifier tube every 6 months, or however long they may last at full rating. I like the idea of using this tube as I have several but wonder how long they will last.
Check the link below.
Current rating for your rectifier will be well within rating for your current draw. Key point is "average current in a full wave circuit is .5 x I D.C. per diode"
Compare the Philips EZ81 datasheet with East German (DDR) RFT EZ81 datasheet . I see no glaring discrepancies. The Philips datasheet suggests some "wiggle room", especially if the value of the 1st filter cap. is held down.
I indicate the RFT variant, as AA sponsor Jim McShane shows a substantial number of RFT EZ81s being available for sale. Both EH and JJ offer current production 6CA4s. If the JJ 5AR4 is anything to go by, steer clear.
Eli D.
If it is a cap-input filter, that would depend on the size of said cap. For an L-C filter, it should be quite happy.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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