Simplistic Mosfet HV Shunt Regs - Page 327

merlin el mago · 10th October 2012, 01:08 PM

@Salas
How can increase the current, max current can get are 20mA with +280V (with dummy load & ECC81 preamp), it's due to use AZ1?

Salas · 10th October 2012, 01:14 PM

It probably does not give you more constant current, if it could the reg would hit 100mA+

merlin el mago · 10th October 2012, 01:21 PM

I ask Rod.

merlin el mago · 10th October 2012, 01:43 PM

Rod said 50mA....

Salas · 10th October 2012, 03:50 PM

Yours does not, obviously. What are the differences? He uses CLC, you use one capacitor. Now what are the values for all those? What transformer secondary he specifies? 50mA at what voltage? Something is not optimized in your case for 50mA constant current to be drawn at the voltage level you require from that small vintage rectifier tube. You use just 6mA for your audio tubes you are lucky.

merlin el mago · 11th October 2012, 09:03 AM

Possible be the tx I will try with another 240VAC or I will use both in parallel to have more current.

merlin el mago · 11th October 2012, 10:13 AM

Gotcha was using only one tx giving less current than needed, with 2 tx in parallel I measured 25mA with B+ +280V

Salas · 11th October 2012, 10:18 AM

You mean two secondaries or an actual 2nd transformer? What kind of VA is its spec? Should have had high impedance and lost a lot of voltage.

merlin el mago · 10:42 AM

I use two tx in parallel, I don't know VA rated, both are used in an Audionote DAC with two ECC88/6922, measured two secondaries in parallel give me 58 Ohms.

king4joy · 12th October 2012, 11:29 AM

Salas...further to my post #3182...I have moved the second choke to parallel with the first choke....now with no load....the PSU output (accross the bleeder resistor, a 22K/50W) = 295V....and when I connect a dummy load of a pair of parallel 10K/50W that I have on hand (I hope it will be close enough to 6.4K)...the output = 271V....is it possible to work out the value of the bleeder to give say about 290V to the SSHV2 as input....to get 270V output from it please??......I will remember to send photos after it is all finished....cheers....

11th October 2012, 10:40 AM	#3269
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I use two tx in parallel, I don't know VA rated, both are used in an Audionote DAC with two ECC88/6922, measured two secondaries in parallel give me 58 Ohms. Last edited by merlin el mago; 11th October 2012 at 10:42 AM.

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10th October 2012, 01:08 PM	#3261
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	@Salas How can increase the current, max current can get are 20mA with +280V (with dummy load & ECC81 preamp), it's due to use AZ1?

10th October 2012, 01:14 PM	#3262
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	It probably does not give you more constant current, if it could the reg would hit 100mA+

10th October 2012, 01:21 PM	#3263
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I ask Rod.

10th October 2012, 01:43 PM	#3264
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Rod said 50mA....

10th October 2012, 03:50 PM	#3265
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Yours does not, obviously. What are the differences? He uses CLC, you use one capacitor. Now what are the values for all those? What transformer secondary he specifies? 50mA at what voltage? Something is not optimized in your case for 50mA constant current to be drawn at the voltage level you require from that small vintage rectifier tube. You use just 6mA for your audio tubes you are lucky.

11th October 2012, 09:03 AM	#3266
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Possible be the tx I will try with another 240VAC or I will use both in parallel to have more current.

11th October 2012, 10:13 AM	#3267
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Gotcha was using only one tx giving less current than needed, with 2 tx in parallel I measured 25mA with B+ +280V

11th October 2012, 10:18 AM	#3268
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	You mean two secondaries or an actual 2nd transformer? What kind of VA is its spec? Should have had high impedance and lost a lot of voltage.

12th October 2012, 11:29 AM	#3270
king4joy diyAudio Member Join Date: Apr 2011	Salas...further to my post #3182...I have moved the second choke to parallel with the first choke....now with no load....the PSU output (accross the bleeder resistor, a 22K/50W) = 295V....and when I connect a dummy load of a pair of parallel 10K/50W that I have on hand (I hope it will be close enough to 6.4K)...the output = 271V....is it possible to work out the value of the bleeder to give say about 290V to the SSHV2 as input....to get 270V output from it please??......I will remember to send photos after it is all finished....cheers....