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  1. P

    B & O Penta amplifier repair and Tr equivalents

    Have uploaded a tigher view of the area of interest.
  2. P

    B & O Penta amplifier repair and Tr equivalents

    Will do. Yes sorry about the shots. They were screen grabbed from a b&o pdf manual. Unfortunately the repair manual was too large to upload to the forum. Thanks for the reply will get back to you within 12 hours with the measurements.
  3. P

    B & O Penta amplifier repair and Tr equivalents

    B&O Amp is overview. Amp2 is tighter view on the o/p stage
  4. P

    B & O Penta amplifier repair and Tr equivalents

    Hi Dorke, many thanks for your reply. I'm uploading the B&O manual with the amplifier section on page 2-4. Right hand side you will see the tr's I was asking about. Seperating the TR's seemed a good idea so I isolated the last 2 on both power rails by disconnecting the current limiting...
  5. P

    B & O Penta amplifier repair and Tr equivalents

    Hi all, just taken on a project - a 150w B&O amplifier from the base of a Penta loudspeaker. The ouput uses 3 cascaded pairs of SC3281 and SA1302. The unit was blowing the main power fuse - suggesting one or more of these transistors had gone short circuit. With nothing on the resistance...
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