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I agree AnTek transformers are good quality, even they are made in China, like the iphone and Tesla.

Chinese products are OK, but much cheaper buy directly from Taobao.

AnTek transformers are made in China. I purchased the AS‑4T400 (400VA, 400V) transformer and the AS‑3T350 (300VA, 350V) tube transformer to build the Blue Hawaii and Carbon amps. The cardboard packaging had “Made in China” labels, and some of them were partially peeled off. If I had known they were made in China, I might have bought them directly from Taobao.

You may use the Epoxy Glue to fix it.

Thank you for your explanation, Spritzer.

Such high voltage is too close to the head, will it affect the brain? say cancer.

Thank you Dr.Kevin.

Hope Kevin will explain the circuit detail.

So complicated !

https://drive.google.com/drive/folders/1r3g2TAtBUaBdiMorTWX7yYgeJ7maQbYW https://drive.google.com/drive/folders/0B7egryukiT7_TFlEQlBRejdVdDQ?resourcekey=0-nGWwBYQ_Uivj-ciBLYMeaA

https://www.richardsonrfpd.com/Products/Product/C2M1000170D

They are in China. 86 is China, Hong Kong is 852.

We cannot get these 2SK109 and 2SK389 anymore, they are obsolete for a long time, all of them are fake from AliExpress.

Hi Kevin, Thank you for your message about the bias of the cfa3 amp, I am running the ZF, by disconnecting the 4 600p, I could adjust the bias smoothly to 200mA, no squeak or oscillation any more. What are those 600P for?