No mains transformer B+ ?

Salas · 14th March 2007, 11:19 AM

I have a quartet of RCA 6V6G dark glass NOS. Having a 230V AC outlet I wonder if there is something negative into rectifying directly to 300-320VDC and powering some some possible 6V6G amp with it. Transformers help a little with mains grunge also, but apart from that, have you tried it? Is it a good practice not to use a transformer when AC gives compatible voltage to rectify for needed B+ by luck?

phase_accurate · 14th March 2007, 11:22 AM

Quote:

Is it a good practice not to use a transformer when AC gives compatible voltage to rectify for needed B+ by luck?

It is only good practice if you don't mind getting killed by your amp !!!

Regards

Charles

Salas · 14th March 2007, 11:25 AM

Elaborate please.

arnoldc · 14th March 2007, 11:37 AM

It's all about safety! You would want to isolate your circuit from the mains.

Soon, the safety patrol will gang up on you

Original Burnedfingers · 14th March 2007, 11:41 AM

If I understand you correctly you want to take your main power AC feed and rectify and filter it to DC without the use of a transformer.

Do you enjoy life? This is very stupid! Never, never, even consider trying something like this!

Salas · 14th March 2007, 11:44 AM

Can't a 230VAC 1:1 transformer with 0.3A capability kill someone touching a 320V B+ all the same?

phase_accurate · 14th March 2007, 11:50 AM

From a legal point-of-view there might be quite a difference between being killed or being killed all the same !

If you rectify your mains directly then a wall outlet that is wired the wrong way around is actually all it takes to kill you.

Regards

Charles

Original Burnedfingers · 14th March 2007, 11:54 AM

Salas

Is you life worth the cost of a transformer? If not then I highly suggest that you sell the tubes and anything else associated with building an amplifier.

Salas · 14th March 2007, 11:55 AM

OK then, I will not do it, bcs if an outlet is wrong there will by no transformer to fry, but the first one who touches the RCA plug. Got it.

Salas · 14th March 2007, 12:04 PM

Quote:

Originally posted by phase_accurate
From a legal point-of-view there might be quite a difference between being killed or being killed all the same !

If you rectify your mains directly then a wall outlet that is wired the wrong way around is actually all it takes to kill you.

Regards

Charles

I will get a 230VAC 1:1 toroid, Audio Note 8KPP OPT and make an Audio Tropic musical machine, I am not giving my RCA 6V6Gs to nobody!

14th March 2007, 11:19 AM	#1
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No mains transformer B+ ? I have a quartet of RCA 6V6G dark glass NOS. Having a 230V AC outlet I wonder if there is something negative into rectifying directly to 300-320VDC and powering some some possible 6V6G amp with it. Transformers help a little with mains grunge also, but apart from that, have you tried it? Is it a good practice not to use a transformer when AC gives compatible voltage to rectify for needed B+ by luck?

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14th March 2007, 11:25 AM	#3
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Elaborate please.

14th March 2007, 11:37 AM	#4
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	It's all about safety! You would want to isolate your circuit from the mains. Soon, the safety patrol will gang up on you

14th March 2007, 11:41 AM	#5
Original Burnedfingers diyAudio Member Join Date: Nov 2002	If I understand you correctly you want to take your main power AC feed and rectify and filter it to DC without the use of a transformer. Do you enjoy life? This is very stupid! Never, never, even consider trying something like this!

14th March 2007, 11:44 AM	#6
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Can't a 230VAC 1:1 transformer with 0.3A capability kill someone touching a 320V B+ all the same?

14th March 2007, 11:50 AM	#7
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	From a legal point-of-view there might be quite a difference between being killed or being killed all the same ! If you rectify your mains directly then a wall outlet that is wired the wrong way around is actually all it takes to kill you. Regards Charles

14th March 2007, 11:54 AM	#8
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Salas Is you life worth the cost of a transformer? If not then I highly suggest that you sell the tubes and anything else associated with building an amplifier.

14th March 2007, 11:55 AM	#9
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	OK then, I will not do it, bcs if an outlet is wrong there will by no transformer to fry, but the first one who touches the RCA plug. Got it.

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