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I picked up a 448 not long ago. Dont see what the rave is. A 449 is much more versatile. My 448 had blown final and driver. Why people crank these up for a few watts wont get out and distorts the mod. Anyway, after a new set of transistors and checking caps and resistors,  checking voltages and aligning it as per sams, the dang thing wont put out more than 2 watts with a eye bulging whistle into the mic. Even on sideband. Im not one to crank up radios. I prefer proper amps for that but it would be nice to know why I cant get anymore than 2 watts out of transistors that have an hfe of 150.