J&K User Comments

A user of ours in USA had just posted his creation on in Audio Asylum.

801A Direct Heated Single Ended Triode Amplifier

"Initial impressions - clean tops and mids, and the lows are nice and tight. J&K audio xformers give this tight sound to the lows."

Direct link below:


http://audioasylum.com/forums/set/messages/8/81236.html

Link to the output transformers used:

http://jandkaudiodesign.blogspot.sg/2015/12/801a-output-transformer.html

Primary impedance:             15KΩ

Secondary taps:                     0-4-8Ω
Primary DCR:                         570Ω（B-P，12℃）

Secondary DCR:                    0-4 Ω (0.3Ω); 0-8 Ω (0.42Ω)

Primary inductance:              135H（DC bias at 30mA，20Hz，5Vrms）
Max primary current:              50mA (recommended >= 30mA)

Matching

DCR:                                          <2% (<1Ω)

Primary inductance:                <5% (<3H)

Frequency response (in circuit)

          20Hz (-0.26dB) – 1kHz(0dB) – 20kHz(-0.5dB)

          10Hz (-0.5dB)   – 1kHz(0dB)  – 55kHz(-3dB)

 
J&K Audio Design
4/4/2016

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