How do I implement an AZ1 rec tube???

djn · 18th January 2010, 12:47 PM

Hi All, I have a couple amps in the works and trying to save a bit of money and using parts on hand. I have an AZ1 rec tube and socket and want to use it but I see that it is 4v on the filly vs 5v on most everything else. So, I my transformer, how can I take the 5v lines and knock them down to 4v for the AZ1??? Cheers.

TheGimp · 18th January 2010, 01:18 PM

Easiest way is a dropping resistor in series with the filaments.
If you have a 5V supply and need 4V, you only need to drop 1V.

Divide 1 by the filament current of the AZ1 and that is the resistor value you need.

djn · 18th January 2010, 02:26 PM

Up to this point, I have been a kit type builder. Can you explain a bit more. Not sure I am catching what you are saying. Thanks in advance.

Zen Mod · 18th January 2010, 02:36 PM

put 1R/3W in series with AZ1 fill.

andyjevans · 18th January 2010, 02:44 PM

Be careful that the AZ1 has enough current potential for an amp - it's not the most robust rectifier out there.

500v - 60mA
400v - 75mA
300v - 100mA

More of a preamplifier tube really.

andy

18th January 2010, 12:47 PM	#1
djn diyAudio Member Join Date: Oct 2004	How do I implement an AZ1 rec tube??? Hi All, I have a couple amps in the works and trying to save a bit of money and using parts on hand. I have an AZ1 rec tube and socket and want to use it but I see that it is 4v on the filly vs 5v on most everything else. So, I my transformer, how can I take the 5v lines and knock them down to 4v for the AZ1??? Cheers.

18th January 2010, 02:36 PM	#4
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	put 1R/3W in series with AZ1 fill. __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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18th January 2010, 01:18 PM	#2
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	Easiest way is a dropping resistor in series with the filaments. If you have a 5V supply and need 4V, you only need to drop 1V. Divide 1 by the filament current of the AZ1 and that is the resistor value you need.

18th January 2010, 02:26 PM	#3
djn diyAudio Member Join Date: Oct 2004	Up to this point, I have been a kit type builder. Can you explain a bit more. Not sure I am catching what you are saying. Thanks in advance.

18th January 2010, 02:44 PM	#5
andyjevans diyAudio Member Join Date: Sep 2003 Location: London	Be careful that the AZ1 has enough current potential for an amp - it's not the most robust rectifier out there. 500v - 60mA 400v - 75mA 300v - 100mA More of a preamplifier tube really. andy

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