Mechanical connections, especially one's that move are also notorious amplifier killers, relays, pots, and switches. Here is a big one, the Band switch. Single Band amps, made for one band only, like a 10 or 11 meter only amps, do not even have a band switch. However, most Ham band amps do. The switch connects to the proper coil tap for the perspective band on a multi band amp. Sure, a heavier switch helps, but with time, even the best switches are prone to failure. Metal fatigue makes the connection lose its grip and tarnish and grime make them lose their electrical connection. Another quick kill is if the operator moves or changes bands while keyed. No switch can handle that. Same with when an operator turns on the Preamp while keyed. Bye-Bye preamp transistor. Sure, band switches can be tightened and cleaned, that helps, but still 50-year-old metal. Better to replace and best, if possible, just bypass it and convert to a single band amp. Most know that with every connection an amplifier goes through, it loses power. Same with the bandswitch. RF power in, then through the band wafer, then out another switch, plus that big ole un-needed big Ham band coil is in the mix too. On average, removing all the un-needed stuff and monobanding a mulitband amp increases efficiency and gives you about 5% more out. This is power the tube was already putting out, but lost going through the added circuitry. More out, more dependable amp and slightly cleaner too. Win, Win.

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