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  1. R

    All New Amplifier Technology From MSB-Introducing the M500 and the S500

    Input transformer on XLR, Lundahl.
  2. R

    Spectral DMA 150 Upgrade

    hi, it was not necessary to adjust the bias, because it was the same (+/- 5%) on all row. Offset: first 70-80 mV, after 5 mV. With the new capacitors we have better control and dynamics, I would say we have managed to improve.
  3. R

    Spectral DMA 150 Upgrade

    I have seen the caps deformed on the top. really weren't any listening problems.
  4. R

    Spectral DMA 150 Upgrade

    thanks Jon Q, next week it will be done! report obviously. Did you get all the schematics of the 150?
  5. R

    Spectral DMA 150 Upgrade

    Question for Jon, how should you check the bias (4 blue trimmers)? The offset?
  6. R

    Spectral DMA 150 Upgrade

    Hi, my DMA150 S2 had two swollen capacitors. I decided to change them all. It was hard work unsoldering the snap-in caps ... a few pads went and I had to rebuild. I put photos of the work. Thanks to Jon Q for the very helpful photos your job.

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