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Old 1st April 2009, 02:10 AM   #1
eeyore is offline eeyore  Australia
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Default Audio Note Kit 1 PSU question

Can anyone confirm the current rating required for the choke of the AN Kit 1? I am thinking of getting the kit and adding/changing the PSU choke, since it does it for both channels, I am not sure what the current rating is, I was planning on getting a 150mA choke for this purpose. Would it be suitable? Thanks.
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Old 2nd April 2009, 08:55 PM   #2
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Location: Warwickshire UK
For 2 x 300B SE (60..75mA each) and 4 preamp stages for stereo (8..10mA each) I would work on a 200mA minimum rating...

alternatively, separate chokes for the preamp stages makes quite a bit of difference to the sound, I believe.

If you get the 150mA rated part, can increase the 300B cathode resistance to reduce current. I like 300B-SE at the 360V 60mA recommended by Western Electric - as best sounding and kind to the valves.
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Old 2nd April 2009, 09:46 PM   #3
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azazello's Avatar
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Location: Bulgaria
"If you get the 150mA rated part, can increase the 300B cathode resistance to reduce current. I like 300B-SE at the 360V 60mA recommended by Western Electric - as best sounding and kind to the valves."

....and You must increase mu preamp, change its anode and cathode
resistors.....I don't prefer You....The sound is different, If You use 300B
with Ia=50. 60, or 70 ma.
Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 3rd April 2009, 12:29 AM   #4
KT is offline KT  United States
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Location: USA

I purchase and built the Audio Note Kit One back when it was sold by Angela Instruments, around 1997.

The choke that came with the kit at that time was specified at 10H/200mA.

I don't know if the specs have changed since then, but this seems to be around the range suggested by others.

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