Tube rectifiede +- supply...

MiiB · 20th April 2009, 04:35 PM

Hi I would like to make a Tube rectified LC +- supply does anyome have a basic shematic to workfrom...
I especially interested to gain knowledge of rectifier tubes is there any that in a single package supports +- supplies...

The intention is to make a supply for a poweramplifer input and VaS stages.. app +-50V at 10 mA..

thanks Michael

Eli Duttman · 21st April 2009, 12:22 AM

Michael,

You are in luck. For the low voltage and small current you indicated, the 6JU8 quad diode will work. As for a schematic, other than using vacuum diodes in the bridge, follow the commonplace pattern of a CT rectifier winding and bridge rectifier.

What sort of filter do you have in mind, Π section or choke I/P?

MiiB · 21st April 2009, 07:23 AM

Thanks Eli....

I have mis read.. my sims...
I need app 40 miliamps at +- 50 V per channel
That is in total a little less tha 100 mA wit a little overhead
So the suggested tube is not sufficient as I can see that it will only manage about 10 mA...

I'll have to finde more powerfull diodes... I'll use the LC.. filter style...

The main reason for this idea is to avoid the Hf switching residuals...from solid state diodes....

Main question is how to couple the rectifer tubes to a center tapped R-core to create a +- supply wit common gnd...?

SpreadSpectrum · 22nd April 2009, 01:03 AM

Well, if that's all you're worried about use Schottky diodes

Or, you could always properly damp the resonant circuit and stop the oscillation dead(RC snubber). You would have to be able to measure leakage inductance, though. Don't use vacuum as a crutch.

I'd better get out of here before the lynch mob finds me.

Eli Duttman · 22nd April 2009, 02:30 AM

SpreadSpectrum is correct. Schottky diodes are every bit as quiet as vacuum diodes and make the construction of the bipolar PSU really easy.

4 diodes in 1 bottle is not exactly commonplace. You could build the bridge from a pair of twin discrete diodes. Possible types are the 6BY5 and 117Z6.

BTW, if you combine SS rectification with choke I/P filtration, make certain to install a protective snubber cap. or MOV. Inductive kick back spikes can easily destroy SS diodes.

20th April 2009, 04:35 PM	#1
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	Tube rectifiede +- supply... Hi I would like to make a Tube rectified LC +- supply does anyome have a basic shematic to workfrom... I especially interested to gain knowledge of rectifier tubes is there any that in a single package supports +- supplies... The intention is to make a supply for a poweramplifer input and VaS stages.. app +-50V at 10 mA.. thanks Michael

21st April 2009, 12:22 AM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Michael, You are in luck. For the low voltage and small current you indicated, the 6JU8 quad diode will work. As for a schematic, other than using vacuum diodes in the bridge, follow the commonplace pattern of a CT rectifier winding and bridge rectifier. What sort of filter do you have in mind, Π section or choke I/P? __________________ Eli D.

22nd April 2009, 02:30 AM	#5
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	SpreadSpectrum is correct. Schottky diodes are every bit as quiet as vacuum diodes and make the construction of the bipolar PSU really easy. 4 diodes in 1 bottle is not exactly commonplace. You could build the bridge from a pair of twin discrete diodes. Possible types are the 6BY5 and 117Z6. BTW, if you combine SS rectification with choke I/P filtration, make certain to install a protective snubber cap. or MOV. Inductive kick back spikes can easily destroy SS diodes. __________________ Eli D.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Tube power supply	duderduderini	Tubes / Valves	1	9th December 2008 04:33 AM
looking HV pwr supply kit for car tube preamp	tomat	Car Audio	2	26th September 2008 02:03 AM
tube power supply	MiiB	Tubes / Valves	10	2nd March 2008 01:52 PM
Tube power supply for TT	Miniwatt	Analogue Source	1	8th March 2005 06:49 PM
Power Supply and VR tube help!	AudioGeek	Tubes / Valves	24	28th February 2004 12:16 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

21st April 2009, 07:23 AM	#3
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	Thanks Eli.... I have mis read.. my sims... I need app 40 miliamps at +- 50 V per channel That is in total a little less tha 100 mA wit a little overhead So the suggested tube is not sufficient as I can see that it will only manage about 10 mA... I'll have to finde more powerfull diodes... I'll use the LC.. filter style... The main reason for this idea is to avoid the Hf switching residuals...from solid state diodes.... Main question is how to couple the rectifer tubes to a center tapped R-core to create a +- supply wit common gnd...?

22nd April 2009, 01:03 AM	#4
SpreadSpectrum diyAudio Member Join Date: Nov 2007	Well, if that's all you're worried about use Schottky diodes Or, you could always properly damp the resonant circuit and stop the oscillation dead(RC snubber). You would have to be able to measure leakage inductance, though. Don't use vacuum as a crutch. I'd better get out of here before the lynch mob finds me.

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read