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Group Buy for Jan's high voltage regulator

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#461
I'm curious as to why you wouldn't just use a power transformer that would provide a range of voltage closer to that which you would like to use that the T-Reg would more easily accommodate. Or is it that you want to operate the KT88 close to its maximum voltage, as the datasheet for that tube specifies?
 
#463
By the way I am using IXFH12N100Q for Q1 and IXTP08N100D2 for Q8 and C3 rated as 1KV for T-Reg board. IXFH12N100Q be able to sustain 1KV@300mA in DC from datasheet. Q1 will be mounted to a chassis that has really large heatsink on both sides of the chassis as part of the chassis box.

Just wonder if Any other parts in T-reg board should I need to upgrade for voltage rating?
 
#464
tanker135 said:
I am building a power supply for my KT88 PP amp that required 134mA/channel (just for KT88 tube). I could install them as a two chassis configuration (1 for power supply and 1 for KT88 tubes and its components). Or as a separate mono blocks consisting of four chassis.

Attached is the front end power supply of my T-reg. The purpose is to bring the voltage down to a safe level before the T-reg. The output from choke/capacitor C1 is over 730VDC with no load, 650VDC@35mA and still over 600VDC @140mmA load.

The bleeder network served two purposes. Since it's a choke input then it needs a minimum current at a certain voltage. With above network I can bring the voltage down around 610V@65mA first 45 seconds before applied to T-Reg board and waiting for the KT88 tubes to conduct. So the bleeder network provides the minimum load for the choke the first 45 seconds. After 45 seconds it acts as a normal bleeder resistor network after power turn off.

As I understand from searching through the web it said the power tubes similar to KT88 required about 12 seconds to conduct when first turn on.

If my C3 capacitor in T-Reg board is rated as 1KV, does it really necessary for installation of above front end network to bring the voltage down. If I install above network, should I decrease the single shot timer to about 12 seconds or less?

Inputs, comments and suggestion are greatly appreciated. Thank you.
Click to expand...


I would recommend a tube warm-up switch (standby/run) to allow the power tubes to get hot prior to turning on B+. I have been installing these in all of my high power DIY amps. These have a lot of other advantages as well.
 
#465
Hello!
I accidentally came across this drawing about using the T-Reg for +/_ voltage rails.

https://www.linearaudio.net/sites/linearaudio.net/files/treg for neg supply_0.PNG

Any drawbacks by doing this?

Regulated voltage is 200v (see attached circuit), and it has ECC82 all the way.

Do I need two secondary windings from one single power transformer or two power transformers with your T-Reg V5 to generate +/- 200v?

Thanks!
 

Attachments

  • treg for neg supply.png
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  • Transcendent Sound Grounded Grid (Full).pdf
    Transcendent Sound Grounded Grid (Full).pdf
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  • 478612954_10233396814336148_3681258981938961893_n.jpg
    478612954_10233396814336148_3681258981938961893_n.jpg
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#466
If you want to use two T-regs totally independent (what is the case here) you need two independent AC supplies.
Do not groung the AC supply of the neg reg, use it as shown in my drawing, only one gnd connection at the output of the T-reg.
BTW You can use separate windings on a common xformer as long as the windings are totally separate.

Jan
 
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#467
jan.didden said:
If you want to use two T-regs totally independent (what is the case here) you need two independent AC supplies.
Do not groung the AC supply of the neg reg, use it as shown in my drawing, only one gnd connection at the output of the T-reg.
BTW You can use separate windings on a common xformer as long as the windings are totally separate.
Click to expand...

Hello!
Other than using conventional power transformer. I have 2 sets of switching mode power supply capable 260vdc. Can I use SMPS plus your T-Reg V5 for +/- 200v?

Thanks Again!
 
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#470
Voltage is always a voltage difference between two points. It is wrong to speak about a voltage at some point. That is why your multimeter has two probes.
The 250V is between the two terminals. It depends on which one you ground, what the output voltage is on the other terminal. Just make sure it is not connected to anything else as I mentioned.
This should get you going, if not please review the definition of voltage difference.

Jan
 
#475
The B+ and B- will go to DCin and DCref.
Measure resistance between the smps outputs and the mains inputs, should be open.
Also between case and the outputs, should all be open.
Common IEC is no problem as long as it is all insulated from the outputs, which normally it is.

But realise this is a pretty complex setup, and if you have issues, you're on your own.
T-reg itself is complex.
Maybe this is not the best project for you.
Also, if you use the 6.3V outputs from the smps it most probably won't work.

Jan
 
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