Altec Bolero 890c schematic

[vincenzo]

Thanks everybody. Looks like I came to the right place. After reading these posts I will most likely not bother bypassing the switch.
But I will go ahead and replace the capacitors. Are there any particular brand of capacitors that you would recommend? I don't mind spending a little more if it makes a difference. My first Altec purchase, and I'm really pleased.

[vincenzo]

Also thanks to mike1 and mah for the photos and sketched schematic!

[Altec Best]

The three resistors controlled by the switch are 15, 15 and 30 ohm. It's a little confusing to me how the slide switch is wired. When I measured the resistance with the drivers removed (resistance across the leads going to the tweeter) I got 31.8 ohms at the +3 dB setting; 10.6 at the Norm setting; and 7.6 at the -3dB setting. Given some tolerance, it seems the -3dB setting parallels the two 15 ohm resistors, and the Norm setting parallels the 30 and one of the 15 ohm resistors.

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Here's my crude schematic of the crossover with the switch details uncertain to me.

Thanks for taking the time to draw up a schematic Miker1 !