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The ultimate DIY? A Stax SRM-T2!


spritzer
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Yeah, that knob is way nice. That is titanium?

BTW, what ever happened to that guy on hf that was doing knobs? Seems like he disappeared, but I guess I haven't been over there much (at all) lately. I think he did a titanium one or two...

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Thank you for the advice.

Before soldering, adjusted in the middle position for all pots.

Check Current Sources = OK, no shorts.

Cafe break = done

Wear goggle = OK

Flip the switch from the safe location.

Confirmed all heaters are ON and wait for the timer

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Thank you for the advice.

Before soldering, adjusted in the middle position for all pots.

Check Current Sources = OK, no shorts.

Cafe break = done

Wear goggle = OK

Flip the switch from the safe location.

Confirmed all heaters are ON and wait for the timer…

No smoke and flying parts however,

LED D1, D6,D7,D10,D11 D23 and D24 for both channel does not lit up.

Active battery stays 808V and can’t adjust. ???

I am regretting that I did not facing Mecca. :P

That got me thinking. Doing some calculations, the LED's are all operating at reasonably low currents - either 1mA or around 0.5mA. So they will only light dimly, and from the datasheet develop 1.8V.

I'd start looking around D24, Q30 and Q31. These are current sources for Q4, Q5 and provide the current through the batteries. This current should be 1.8 - Vbe = 1.2V across a 240 ohm emitter resistor - or 5mA.

In addition if something is screwy with the circuit around D1, the biassing of Q4 and Q5 will be up the chute.

One or both of those could well put the battery into an inappropriate regime - if it is expecting 5mA and is getting significantly less for example (I haven't figured the circuit for the battery yet).

Er good luck - I'll be in the same place as you in around a month's time.

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