6V6 line preamp - Page 40

Salas · 10th January 2012, 10:30 AM

Quote:

Originally Posted by buzzforb

Salas,
tube or solid state rectification? Recommendations or does it matter.

I had used 5R4GY & 5AR4 mostly for it, never had it with SS. So no experience of pros and cons with this pre.

buzzforb · 10th January 2012, 10:33 AM

Quote:

Originally Posted by Salas

I had used 5R4GY & 5AR4 mostly for it, never had it with SS. So no experience of pros and cons with this pre.

Choke loaded?

stajo · 10th January 2012, 10:36 AM

Quote:

Originally Posted by buzzforb

Choke loaded?

Is never wrong, if you got the voltage and amps for 340 B+. Salas used caps tho.

/Staffan

Salas · 10th January 2012, 10:40 AM

Quote:

Originally Posted by buzzforb

Choke loaded?

CLC it is.

buzzforb · 11th January 2012, 12:01 PM

Salas,
I have orderd the last of the parts with a few exceptions. I have cohsen to go solid state on the B+ simplty because i don't have enough secondaires on my trafo, 2-300 and 2-6.3. The question i have concerns the LM317 regulator. I have never seen it wired this way an don't know the actual operating conditions. Since there are no voltage setting resitors, is the voltage equalt to that after rectification? Is the current set by the 5W resistors? I only have 6.3 V taps on my secondary. These seemed ok seince the thube datasheet showed 6.3V and 45mA for filament. You seem to have it running at higher specs if i am figuring correctly. Sorry for the basic question.

Zen Mod · 12:14 PM

download datasheet of 317 and you'll see that's basic CCS arrangement

you need few volts more for headroom ( CCS needs few volts for proper operation)

can you add several turns of enameled wire , connected in series with existing filament winding ( toroid ? ) ?

I hope 45mA is typo .........

with one zero missing

buzzforb · 11th January 2012, 12:17 PM

THanks ZenMaster. I took a quick glance at the formula at the top of the datasheet showing voltage regulation and went no further. RTFM applies here, I believe.

stajo · 11th January 2012, 12:19 PM

You could also serial the 2 secondarys. Connection between the two 300 would be your zero for tube rectifying.Serial the two 6,3 gives 12,6 wich is good headroom for the LMs

Staffan

buzzforb · 11th January 2012, 12:30 PM

Thanks to all. It is funny how much pleasure i get out of figuring out something as simple as a 317 CCS regulator!

massimo · 11th January 2012, 01:21 PM

Quote:

Originally Posted by Zen Mod

you need few volts more for headroom ( CCS needs few volts for proper operation)

Ok, but how many (roughly)? 2? 4? 6? or....

P.S. If I'm not wrong Coleman's Regs work more or les on the same principle (CCS)

11th January 2012, 12:11 PM	#396
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	download datasheet of 317 and you'll see that's basic CCS arrangement you need few volts more for headroom ( CCS needs few volts for proper operation) can you add several turns of enameled wire , connected in series with existing filament winding ( toroid ? ) ? I hope 45mA is typo ......... with one zero missing __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb Last edited by Zen Mod; 11th January 2012 at 12:14 PM.

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11th January 2012, 12:01 PM	#395
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Salas, I have orderd the last of the parts with a few exceptions. I have cohsen to go solid state on the B+ simplty because i don't have enough secondaires on my trafo, 2-300 and 2-6.3. The question i have concerns the LM317 regulator. I have never seen it wired this way an don't know the actual operating conditions. Since there are no voltage setting resitors, is the voltage equalt to that after rectification? Is the current set by the 5W resistors? I only have 6.3 V taps on my secondary. These seemed ok seince the thube datasheet showed 6.3V and 45mA for filament. You seem to have it running at higher specs if i am figuring correctly. Sorry for the basic question.

11th January 2012, 12:17 PM	#397
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	THanks ZenMaster. I took a quick glance at the formula at the top of the datasheet showing voltage regulation and went no further. RTFM applies here, I believe.

11th January 2012, 12:19 PM	#398
stajo diyAudio Member Join Date: Jun 2011 Location: Stockholm	You could also serial the 2 secondarys. Connection between the two 300 would be your zero for tube rectifying.Serial the two 6,3 gives 12,6 wich is good headroom for the LMs Staffan

11th January 2012, 12:30 PM	#399
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Thanks to all. It is funny how much pleasure i get out of figuring out something as simple as a 317 CCS regulator!