Aikido AC Heater Supply

dmk · 10th July 2007, 03:23 PM

Hi all,

Long time lurker, this is my first post.

I want to build the Aikido pre-amp, and am looking at using a
Hammond 369AX TX and 6sn7 tubes.

The TX specs for Heater are 6.3v @ 2A, I found specs for 6sn7 putting Heater Current at .6A.

Will it be ok to run the four tubes (AC) off this supply? I realise the
combined amps will be 2.4 but hoping maybe this TX will be ok to
supply the current ?

I would prefer not to have to use a second TX.

Do you think I can get away with this setup ??

Cheers
Dave

2KW · 11th July 2007, 12:10 AM

I wouldn't do it. If it doesnt load up the transformer to the point that you don't get the full 6.3 initially, you may have long term problems with heat, and reliability.

minhaj · 11th July 2007, 07:56 AM

Dave,

I am with paul. For long term use it might not be healthy.

Should you still want to try pls ensure heater voltage does not fall below 6 volt per tube and the TX does not get very hot after 2/3 hrs cont. use.

Regards

Original Burnedfingers · 11th July 2007, 10:38 AM

I tried it a while back just because I had the transformer sitting on my shelf. The result was a transformer that ran very warm. I ended up replacing it with one that had a larger 6.3 supply and problem solved.

dmk · 12th July 2007, 04:51 AM

Hi

Thanks for the replies, I will get another TX for the Heater Supply!!

Cheers
Dave

Colt45 · 12th July 2007, 06:28 AM

I'd try it first. Might be ok, depends how over/underrated the trafo is.

10th July 2007, 03:23 PM	#1
dmk diyAudio Member Join Date: Jul 2004 Location: gold coast	Aikido AC Heater Supply Hi all, Long time lurker, this is my first post. I want to build the Aikido pre-amp, and am looking at using a Hammond 369AX TX and 6sn7 tubes. The TX specs for Heater are 6.3v @ 2A, I found specs for 6sn7 putting Heater Current at .6A. Will it be ok to run the four tubes (AC) off this supply? I realise the combined amps will be 2.4 but hoping maybe this TX will be ok to supply the current ? I would prefer not to have to use a second TX. Do you think I can get away with this setup ?? Cheers Dave

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11th July 2007, 12:10 AM	#2
2KW diyAudio Member Join Date: Jan 2007	I wouldn't do it. If it doesnt load up the transformer to the point that you don't get the full 6.3 initially, you may have long term problems with heat, and reliability.

11th July 2007, 07:56 AM	#3
minhaj diyAudio Member Join Date: Dec 2004 Location: Dhaka, the capital of Bangladesh	Dave, I am with paul. For long term use it might not be healthy. Should you still want to try pls ensure heater voltage does not fall below 6 volt per tube and the TX does not get very hot after 2/3 hrs cont. use. Regards

11th July 2007, 10:38 AM	#4
Original Burnedfingers diyAudio Member Join Date: Nov 2002	I tried it a while back just because I had the transformer sitting on my shelf. The result was a transformer that ran very warm. I ended up replacing it with one that had a larger 6.3 supply and problem solved.

12th July 2007, 04:51 AM	#5
dmk diyAudio Member Join Date: Jul 2004 Location: gold coast	Hi Thanks for the replies, I will get another TX for the Heater Supply!! Cheers Dave

12th July 2007, 06:28 AM	#6
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	I'd try it first. Might be ok, depends how over/underrated the trafo is.