Rectifier that doesn't need own filament supply?

CarlyBoy · 9th October 2006, 03:22 PM

Hey Folks,

Is anyone aware of a rectifier tube that can run off the same supply as other tubes in a circuit? I've got a few surplus transformers with no 5V taps. Thanks...

phn · 9th October 2006, 03:28 PM

Novals EZ80 and 81. Octals EZ35 and 6X5. 6AX4 and perhaps other TV damper diodes.

Eli Duttman · 9th October 2006, 03:31 PM

How much B+ current do you need? The Locktal based 7Z4 and the 9 Noval (9 pin mini) based 6CA4/EZ81 are both good for 100 mA. DC and they have respectable PIV ratings.

Tweeker · 9th October 2006, 03:33 PM

Damper diodes. Though they eat alot of current.

Another option would be to burn it down with resistors.

There may H-K considerations mandating they get their own winding.

astouffer · 9th October 2006, 04:19 PM

Don't forget the lonely 6BY5...

sorenj07 · 9th October 2006, 05:20 PM

i'm going to use some 6ay3's in my amp. they have annoying and hard to get "novar" sockets but fortunately triodeelectronics stocks the sockets for reasonable prices. you're bound to find some 6ay3's on ebay, and those are just a few that could work. triode also stocks (the last time i checked) the oddball 6v3 rectifier tube, good for like 850mA and its single cathode is in a top cap

. magnoval socket for that one. i got four for a buck each, hopefully triode hasn't realized the potential and raised the price.

Original Burnedfingers · 9th October 2006, 11:15 PM

How about an 0Z4?

mcs · 9th October 2006, 11:41 PM

Quote:

Originally posted by astouffer
Don't forget the lonely 6BY5...

I didn't think anybody else had discovered those

The 6BY5GA is rated for both damper and rectifier duty, when you look at the Sylvania datasheets.

Best regards,

Mikkel C. Simonsen

tubelab.com · 10th October 2006, 01:08 AM

Quote:

I didn't think anybody else had discovered those

I have a few of these. I tried one once, and it blew up. Maybe it was just bad, I'll have to try another. Maybe they just don't like a 47uF input cap.

I KNOW that an 0Z4 doesn't like a 47uF cap. They are picky about the load current. 30 mA minimum, and 100 to 120 maximum, depending upon the version. The glass ones have a cool purple glow.

I have a few zillion 6AX4's. They are old damper tubes with octal sockets. They seem to take all of the abuse that I throw at them, including a 47uf input cap and 480 volts worth of transformer (B+ of 600V with hybrid bridge).

astouffer · 10th October 2006, 01:19 AM

Thats nothing

I used to use two photo flash caps in series as the first cap after a 5U4 or even 5Y3. Those caps were 160uf at 330v. Even had a large bank of them in a SE 211 amp until one blew up. It left quite a mess of paper and funny white smoke. The only tubes that ever arced over were those flat top 5R4s, but of course now I know better.

9th October 2006, 03:22 PM	#1
CarlyBoy diyAudio Member Join Date: Aug 2006	Rectifier that doesn't need own filament supply? Hey Folks, Is anyone aware of a rectifier tube that can run off the same supply as other tubes in a circuit? I've got a few surplus transformers with no 5V taps. Thanks...

9th October 2006, 03:31 PM	#3
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	How much B+ current do you need? The Locktal based 7Z4 and the 9 Noval (9 pin mini) based 6CA4/EZ81 are both good for 100 mA. DC and they have respectable PIV ratings. __________________ Eli D.

9th October 2006, 03:33 PM	#4
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	Damper diodes. Though they eat alot of current. Another option would be to burn it down with resistors. There may H-K considerations mandating they get their own winding. __________________ Be sure your foil hat has a good low impedance ground.

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9th October 2006, 03:28 PM	#2
phn diyAudio Member Join Date: Oct 2004	Novals EZ80 and 81. Octals EZ35 and 6X5. 6AX4 and perhaps other TV damper diodes.

9th October 2006, 04:19 PM	#5
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Don't forget the lonely 6BY5...

9th October 2006, 05:20 PM	#6
sorenj07 diyAudio Member Join Date: May 2006	i'm going to use some 6ay3's in my amp. they have annoying and hard to get "novar" sockets but fortunately triodeelectronics stocks the sockets for reasonable prices. you're bound to find some 6ay3's on ebay, and those are just a few that could work. triode also stocks (the last time i checked) the oddball 6v3 rectifier tube, good for like 850mA and its single cathode is in a top cap . magnoval socket for that one. i got four for a buck each, hopefully triode hasn't realized the potential and raised the price.

9th October 2006, 11:15 PM	#7
Original Burnedfingers diyAudio Member Join Date: Nov 2002	How about an 0Z4?

10th October 2006, 01:19 AM	#10
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Thats nothing I used to use two photo flash caps in series as the first cap after a 5U4 or even 5Y3. Those caps were 160uf at 330v. Even had a large bank of them in a SE 211 amp until one blew up. It left quite a mess of paper and funny white smoke. The only tubes that ever arced over were those flat top 5R4s, but of course now I know better.

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