The last question

[raymonyng]

Hi, after few months, finally came the this situation. The A side voltage is correct, it’s 215V. 165V  105V. 98V. 1.837V, and the B side is not correct, it 215V. 145V.  141V. 141V. 0.002. Then I flipped over the board and now A side is become B side and B side become A side. This time the B side became to A side is correct, and the A side becomes B side is not correct. That means the welding in both sides re correct. But what’s makes them reading the same when I flipped over the board. Thanks for help.

 

[Doc B]

It looks like the EF86 in the B socket is not conducting. Easiest place to start is swap the EF86 tubes and see if the problem follows when you move the B side tube to the A socket. If it doesn't follow thw tube there might be a bad connection at socket pin B3.

 

[raymonyng]

Hi, thanks for your advice, it’s because of the EF86 the voltage is not correct, so can your company exchange the tube for me? Thanks very much.

 

[Doc B]

Yes, contact Eileen at replacementparts@bottlehead.com and she can send you a replacement EF86.

 

[raymonyng]

Thanks for all, it’s nice sound.