Nattawut Uamkruea, blogger and audio gear maker who passionate in vacuum tube, audio & music.
Producing electronics projects since high school. Seriously upgrade and modify vintage audio equipment for “Real Sound” concept.
He is a co-founder of Soundaries and Sentimental Studio, all audio solution provider.
Experienced and lively explore the listening rooms & audio shops in Japan as his most favorite to do.

Sunday, September 17, 2017

Tube Power Supply for Field Coil Tweeters

One of my friend who own WE16A using WE555 drivers with Selenium power supply

need to add field coil tweeters for extend higher range in his system.

So I remember that I have seen a nice looking tube power supply in Jeffrey Jackson's blog.

And my friend totally agree with this kind of tube & appearance.

He's select field coil tweeter from Atelier Rullit that has higher impedance than WE555 driver.

Atelier Rullit said this tweeter need voltage between 120 - 200 VDC for operation.

So I just design power supply to supply about 165 VDC with voltage regulator tubes.

0A3 (75V) series with 0B3 (90V) to stabilize output voltage.

Main rectifier tubes using large WE355A Thyratron tube with grid as plate. 


Plug with 2 of 0B3 tubes for took photo.

Atelier Rullit Field Coil Tweeter.

Test with real speaker system.

2 of Altec 515B in 817B cabinet style & WE16A with WE555 field coil driver.

Blue glow in large Western Electric balloon tubes.

Indicate voltage & current for one channel.

Do not compare with other types of power supply but for now this power supply work well

and field coil tweeter sound very good.


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