The Fine Things are Always Hand Made

Questons on Scott Allwave

HI just acquired a Scott Allwave 23 (7 knob version) in the Laureate Grande cabinet. This one is complete, except for the tweeters and the main pedestal auditorium 15"speaker. A field coil appears to be attached to the cabinet. Can a 15" speaker be run with a 925 ohm field coil WITHOUT the tweeters which have field coils amounting to a total of 5000 ohms? Does that 5000 ohms need to be part of the circuit in order for the amplifier to operate the main 15" speaker?

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Permalink Reply by Thomas Day on February 22, 2022 at 4:06pm

Chris. The Allwave 23 I think came with a 12 inch speaker. To use a replacement, you would need the 925 ohm field coil, and a 1300 ohm and 3700 ohm resistor in series wired to the 7 pin speaker plug. You will also need the output transformer that is part of the original speaker. Schematics are in the folders section of this web site.

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Permalink Reply by Norman S Braithwaite on February 22, 2022 at 8:00pm

Congratulations on the find. A 50-watt 5000-ohm wirewound "dividohm" resistor is appropriate and required for bias. The tap can be set at 1300/3700. A fixed resistor of this size was included in the original 12-inch speaker pedestal and was in circuit if no tweeters were included. Tweeters were optional but I have yet to find a complete original Laureate cabinet without the tweeter option. PM tweeters may be used in a pinch.