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Old 13th November 2012, 06:33 PM   #1
JackM11 is offline JackM11  United States
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Default Aikido preamp transformer question

Hi,

I have an old Aikido 9pin board and need a power supply for it. The board is configured for 2 6CG7 and 2 6922.
I already have a Radio Shack 6.3v transformer.

I am looking at the Glassware PS-5 B+ Power Supply Kit and it seems to work. It needs a 5v supply for the 5Y3 tube. I guess I need a B+ of 200-300V for the preamp.
Can anyone suggest a transformer for the application? Also, what is the fuse needed for this preamp?

Thanks in advance for any suggestions.
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Old 13th November 2012, 06:49 PM   #2
wicked1 is offline wicked1  United States
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I'm using a hammond 270dx for my aikido preamp. It's a bit larger than it needs. 550ct, and I get about 310v b+
I've got a hammond 269jx in my aikido phono. It's probably a better choice. 500vct. I get about 250v b+
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Old 10th December 2012, 02:13 AM   #3
Wirezz is offline Wirezz  Singapore
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I used a custom wound transformer for a B+ of 280v on my all 12Au7 Aikido. I would recommend a custom wound transformer as it can be built to your exact requirements (both power and voltage) and may work out cheaper then some of the higher end hammond stuff.
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Old 10th December 2012, 01:34 PM   #4
cjkpkg is offline cjkpkg  United States
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I can highly suggest also either the PS-3 or PS-4 if you must have tube rectification.

As far as transformers
Allied Electronics 6K88VG
Allied Electronics 6K56VG if you are using tube rectifier

Or any Edcor that makes at least 500VCT either with or without the 5V rectifier winding.

Most tube centric power transformers will come with a 6.3V tap.

You could also look at Antek for toroidal - in the 250V range since most of the antek units are not center tapped.

DC Heaters will go a long way for a quiet preamp. AC will work if set up properly but DC tends to be easier to manage.
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