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Pioneer SA-506 Stereo Amplifier

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Turnip:
Hi folks,

Have one where very occasionally get a loud crackle on one channel but can't track it down with heat or freezer.

Note Sanyo O/P transistors 2SB616A and 2SD586A are horribly expensive.

Wonder if there's a known issue ?   Thanks - Chris.

downunder:

Hi Chris, Do you need a schematic?           Bruce

jordan:
 Pioneer SA-506

Turnip:
Hi Bruce and Jordan, thanks, had a schematic but yours is better. Problem is intermittent where it nearly blows the cone out of one speaker and the cone stays out 'till the amp is switched off.

Obviously a lot of DC present but on just one channel. Would have replaced the O/P transistors but they're a rather special old fashioned type with tabs on either side rather than the top. Could fit standard NPN/PNP 100v 5a with a bit of metal work but rather keep original - Chris.

downunder:

Hi Chris,

Rather strange transistors, those. Don't know how you feel about ordering from China, but UT Source have the 2SB616A, not the other.

Aliexpress have the 2SD586A, but not the other. See how you go.                          Bruce

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