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Old 14th June 2012, 06:40 PM   #11
rajucc is offline rajucc  India
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Schematic of Tetra all in one and Tetra Sans PS are almost same except R7 and R8.Please suggest value of R12, R11, R18, R14, R16, C17, C18, D1, D2 according to Tetra All In One. ForPower Transformer my preference is EDCOR XPWR221-120/240. 250-0-250 at 130ma, 6.3v at 3A, 5v at 2A is that enough for Tetra Sans PS ?Please suggest.

Last edited by rajucc; 14th June 2012 at 06:44 PM.
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Old 14th June 2012, 11:43 PM   #12
cjkpkg is offline cjkpkg  United States
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Grid reference 1M is a good place to start. Grid stoppers 300R is pretty standard.

R14 and R16 go with the manual specified 30K. R18 you will have to start with the manual specified 1K 2W. Although you may need to increase if you are seeing too much B+ at the plates. Measure and adjust as necessary.

D1 and D2 are just 1n4007's.

For your xformer you do not need a 5V tap. Edcor makes one that has just a HV and 6.3V tap that is appropriate...I cant remember which model but just search for one around 500VCT with a 6.3V tap only...its there...

I used this one...Allied Electronics 6K88VG...works great and cheap. You are only going to be pulling like 30mA total at MOST.
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Old 15th June 2012, 12:11 AM   #13
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Old 15th June 2012, 02:20 AM   #14
rajucc is offline rajucc  India
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Quote:
Originally Posted by cjkpkg View Post
Grid reference 1M is a good place to start. Grid stoppers 300R is pretty standard.

R14 and R16 go with the manual specified 30K. R18 you will have to start with the manual specified 1K 2W. Although you may need to increase if you are seeing too much B+ at the plates. Measure and adjust as necessary.

D1 and D2 are just 1n4007's.

For your xformer you do not need a 5V tap. Edcor makes one that has just a HV and 6.3V tap that is appropriate...I cant remember which model but just search for one around 500VCT with a 6.3V tap only...its there...

I used this one...Allied Electronics 6K88VG...works great and cheap. You are only going to be pulling like 30mA total at MOST.
Thanks for your help.
I want to use Janus Shunt Regulator for Tetra so 5v tap is necessary.
Which Line Stage you use with Tetra or Tetra alone have sufficient output to drive power amp ? Please let me know which line stage is best, Aikido 9-Pin All in One Kit or Aikido Octal All-in-One Kit or any other.
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Old 15th June 2012, 12:20 PM   #15
cjkpkg is offline cjkpkg  United States
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I use a 5687 Aikido I built a few years ago. I have tried other preamps but I keep coming back to the Aikido.

This was before the all in one kits so I would probably recommend a 9-pin all in one as it will give you the most flexibility for tube selection.

You could actually use the all in one kit and feed HVB+ and H+/H- from the all in one PSU if your transformer is robust enough. JB talked about this in the blog where he introduced the Tetra Sans PS. Then you would have your linestage and phono pre all in one chassis. Just a thought.
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Old 17th June 2012, 01:00 PM   #16
rajucc is offline rajucc  India
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Quote:
Originally Posted by alexg View Post
I have tried:

1. 12ax7 - 12ax7, too much gain
2. 12ax7 -5751, sounds good.
3. 5751 - 12at7, sounds better.
4. 5751 - 6sl7, sound good.
5. 12at7 - 12at7, sounds better.
5. still to come: 6sl7 - 6sl7 (am waiting for tubes).

The best sounding that I have tried is 5751 - 12at7 and 12at7 - 12at7.

Am using Denon DL103R into a cinemag step up, Lenco L75.
Did you try 6922 - 12AT7 ?
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