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  1. @spritzer Hi spritzer, one of my dac module is broken, it looks like transistor q2 is broken. I measured b-c which is shorted. But I don't understand the purpose of this pnp transistor, b-c-e are connected and I don't see any resistor around it. Could you give me some hints? Thank you.
  2. understand, thanks very much for the explanation.
  3. https://i.imgur.com/Dz9hxo6.png I found the schematic fo 007, the bias circuit should be similar as t1, actually I don't fully understand how it can get 580v voltage, the output from the transformer only provides 270v, it looks like a half wave rectifier circuit.
  4. Hi Jamesmking, Thank you very much for the details. The t1w has an adjust resistor for one pro bias port, so it can give 3 different bias voltage, a very versatile amplifier.
  5. Hi stax experts, I measured my t1w bias voltage, the pro bias port is 420v and normal bias is about 150v, is this normal or something needs to be replaced? Thank you.
  6. I would like to ask a junior question for power supply, what's the purpose of d2(24v zener) and may I replace ccs and two resistors(1200,100) with a 47k resistor? Thanks.
  7. Thank you for the help.
  8. @spritzer Hi spritzer, could you kindly point me how to modify 313 from 100v to 120v? Thank you very much. I see vlaca's photo and he converted it to 240v.
  9. I found this pic from the forum, how can I do some adjusts for 120V? Thanks a lot.
  10. I recently got a srm-313 with two pro bias, the voltage is japan 100v, does anybody has experience to convert it to 120v us standard? Thank you very much. The amp is still on the way, I found the internal photo from here,
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