6V6 line preamp - Page 34

tinitus · 5th January 2012, 02:57 PM

Quote:

Originally Posted by buzzforb

Salad
I want to ......

got a new 'nick name', I didnt know

buzzforb · 5th January 2012, 03:00 PM

Wow! That looks really fresh. Sorry about the slip up Salad.

I just noticed that the trafo I was looking at had 300ma rating not 30. My bad, although it seemed to work out in the greater scheme of things.

Salas · 5th January 2012, 03:05 PM

200VA for this is super royally mega plenty. You would not want big trafo magnetic field very near though.

buzzforb · 5th January 2012, 04:16 PM

I had planned on seperate PSU enclosure with CR->umbilical chord(1ft)->C, SSHV2. 200VA was only 5$ more than 100VA.

Salas · 5th January 2012, 04:27 PM

Keep the CRC very near to SSHV2 in the main pre box.

buzzforb · 5th January 2012, 05:07 PM

I was under the impression that when doing a standalone PSU, you do most of the filtering away from the main chassis, with only the last C inside before regs. Do you suggest just the trafo on a standalone box?

nicoch58 · 5th January 2012, 06:41 PM

Nick nice feta ...

Salas · 5th January 2012, 06:44 PM

The trafo, the rectification, and that's it. If it was CLCLC or CRCRC it could go 50%-50%. Its better to fully filter what comes riding on the umbilical too if using simple one stage filtering you see.

stajo · 7th January 2012, 04:16 PM

I breadboarded one. Sounded great already on the plank with AC heating and and a dual C-L-C-R-C-L-C. Very little noice and some tiny trafo noice with the ear in the cone.

Gonna tune it up when I get parts for SSHV2.

best
Staffan

Salas · 7th January 2012, 04:28 PM

Well done. Pictures?

5th January 2012, 06:41 PM	#337
nicoch58 diyAudio Member Join Date: Oct 2004	Nick nice feta ... __________________ Sic58

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5th January 2012, 03:00 PM	#332
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Wow! That looks really fresh. Sorry about the slip up Salad. I just noticed that the trafo I was looking at had 300ma rating not 30. My bad, although it seemed to work out in the greater scheme of things.

5th January 2012, 03:05 PM	#333
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	200VA for this is super royally mega plenty. You would not want big trafo magnetic field very near though.

5th January 2012, 04:16 PM	#334
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I had planned on seperate PSU enclosure with CR->umbilical chord(1ft)->C, SSHV2. 200VA was only 5$ more than 100VA.

5th January 2012, 04:27 PM	#335
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Keep the CRC very near to SSHV2 in the main pre box.

5th January 2012, 05:07 PM	#336
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I was under the impression that when doing a standalone PSU, you do most of the filtering away from the main chassis, with only the last C inside before regs. Do you suggest just the trafo on a standalone box?

5th January 2012, 06:44 PM	#338
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The trafo, the rectification, and that's it. If it was CLCLC or CRCRC it could go 50%-50%. Its better to fully filter what comes riding on the umbilical too if using simple one stage filtering you see.

7th January 2012, 04:16 PM	#339
stajo diyAudio Member Join Date: Jun 2011 Location: Stockholm	I breadboarded one. Sounded great already on the plank with AC heating and and a dual C-L-C-R-C-L-C. Very little noice and some tiny trafo noice with the ear in the cone. Gonna tune it up when I get parts for SSHV2. best Staffan

7th January 2012, 04:28 PM	#340
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Well done. Pictures?