6V6 line preamp - Page 49

buzzforb · 3rd February 2012, 07:09 PM

Assembly begins!

brommermartin · 3rd February 2012, 08:37 PM

Quote:

Originally Posted by Bas Horneman

I would actually keep them loctal. Because you can or at least could buy cheap loctal teflon sockets.

Sent from my GT-N7000 using Tapatalk

Yes

i found them, two pieces for 8 euro !!

Salas · 3rd February 2012, 08:49 PM

I hope those Sylvanias will prove amongst the least microphonic then and you stay loctal.

brommermartin · 4th February 2012, 06:57 AM

I have a pair of Philips 6V6GT also so I can compare them with the Sylvania's

buzzforb · 5th February 2012, 12:11 PM

Asked in SSHV thread, but thought i would ask here too.

"Stupid question, I know. But to do final adjustements with tube attached, does the filament voltage also need to be attached. I would assume that without it, the tube is non operable."

I just wanted to quote myself.

Zen Mod · 5th February 2012, 12:50 PM

that question is stupid , if you know answer

if you don't , then it's not stupid

so - yes - tube needs hot heater for proper operation

buzzforb · 5th February 2012, 12:58 PM

First tube and voltage in hundreds, so no question is stupid. Thanks Zen

Zen Mod · 5th February 2012, 01:12 PM

yadayada
ya know .... serve & protect ....

buzzforb · 5th February 2012, 02:32 PM

Any reason why my filament voltage want go above 2V? I get 15V unloaded. I have 2.7 10W instead of parallel 15R and 3.3R. I calculated that this should be correct. Secondary is capable of 3A. What going on?
Pin 2&7 for HV, correct.

Salas · 5th February 2012, 02:41 PM

The Vh will go nominal when the Ih will be nominal through the filament (allowing for +/- tolerance). Check the voltage drop across your LM317T CCS resistor. Does it compute to nominal Ih?

5th February 2012, 12:50 PM	#486
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	that question is stupid , if you know answer if you don't , then it's not stupid so - yes - tube needs hot heater for proper operation __________________ 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

5th February 2012, 01:12 PM	#488
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	yadayada ya know .... serve & protect .... __________________ 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

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3rd February 2012, 08:49 PM	#483
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	I hope those Sylvanias will prove amongst the least microphonic then and you stay loctal.

4th February 2012, 06:57 AM	#484
brommermartin diyAudio Member Join Date: Sep 2009	I have a pair of Philips 6V6GT also so I can compare them with the Sylvania's

5th February 2012, 12:11 PM	#485
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Asked in SSHV thread, but thought i would ask here too. "Stupid question, I know. But to do final adjustements with tube attached, does the filament voltage also need to be attached. I would assume that without it, the tube is non operable." I just wanted to quote myself.

5th February 2012, 12:58 PM	#487
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	First tube and voltage in hundreds, so no question is stupid. Thanks Zen

5th February 2012, 02:32 PM	#489
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Any reason why my filament voltage want go above 2V? I get 15V unloaded. I have 2.7 10W instead of parallel 15R and 3.3R. I calculated that this should be correct. Secondary is capable of 3A. What going on? Pin 2&7 for HV, correct.

5th February 2012, 02:41 PM	#490
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The Vh will go nominal when the Ih will be nominal through the filament (allowing for +/- tolerance). Check the voltage drop across your LM317T CCS resistor. Does it compute to nominal Ih?