If you have leaky caps or other problems, you do what you have to, but otherwise I think it is best leave things alone as long as possible. It has been my experience that with components designed around older parts, whether guitar amps or stereo equipment, mixing in new components for modification or repair sometimes takes away from what you liked about the unit. I second Linnlp12's prudent thinking about not changing resistors (or other parts) unnecessarily. Some units even have their original tubes. They must have done something right, because so many of these units built at least 40 years ago are still in circulation, still in demand and still making music. My understanding is that their policy is to bias tubes at about 75% of recommended voltage. Hopefully, you won't need service anytime soon, because Scott designed these units for very long tube life. Karavite, thanks for your thoughtful comments. The author was Steve Stone if my memory serves me. There are a couple of older absolute sound issues that went into detail about Scott equipment. Or it could be all the compensation caps, equalization "chips" and other components in the circuit. My feeling was that the output transformers were really not all that good. That music disappears with modern resistors, I dont know why. While not the best in detail, they can be very musical. The old carbons give these amps a special flavor and magic. Never change the resistors on these unless you have too. I didnt like the 299 series, never could get it to sound right to me. Marvelous little integrated and you dont see many around. The best one in my book, with upgraded coupling caps and no other changes, was the 233. I remember the difficulty in finding schematics that would actually match what was underneath the chassis. I used to be an avid HH Scott collector and at one time had 98% of all their models, including many of the various versions.
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