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Old 10th July 2007, 03:23 PM   #1
dmk is offline dmk  Australia
diyAudio Member
Join Date: Jul 2004
Location: gold coast
Question 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 ??

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Old 11th July 2007, 12:10 AM   #2
2KW is offline 2KW  Australia
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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.
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Old 11th July 2007, 07:56 AM   #3
minhaj is offline minhaj  Bangladesh
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Join Date: Dec 2004
Location: Dhaka, the capital of Bangladesh

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.

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Old 11th July 2007, 10:38 AM   #4
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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.
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Old 12th July 2007, 04:51 AM   #5
dmk is offline dmk  Australia
diyAudio Member
Join Date: Jul 2004
Location: gold coast

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

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