Feels Like: 48 ☏ Forecast: 53 / 45 ☏ Wind: 5 mph ↑ from East Upcoming 5 hours See more hour-by-hour weather Forecast for the next 48 hours 14 day forecast, day-by-day Hour-by-hour forecast for next week Forecast for the next 2 weeksHourly 36 Hours Weekend 7 Days 14 Days Monthly Atlanta, GA Weather SAVED TO MY LOCATIONS ° Feels like Wind Humidity % Visibility Sunrise Wind gust Pressure Ceiling Sunset Short Term Forecast. The description is geared towards a B-15 but the general principles apply.Weather Today Weather Hourly 14 Day Forecast Yesterday/Past Weather Climate (Averages) Now 50 ☏ Fog. There is some information on biasing here. The bias can be checked and adjusted with a voltmeter. Too cold and the amp can be flat and sterile sounding, too hot and it runs out of headroom and distorts sooner than it should. Bias can be set hotter or colder than the optimal setting and that affects how the amp performs.

An optimal bias will allow the amp to perform as it was intended. The bias sets the operating point of the tube, much like tuning a string to pitch. Ideally, the bias should also be checked during yearly maintenance. These need to be biased when the tubes are changed. Other amps are what is called fixed bias. These are self biasing like the preamp tubes. Some smaller tube amps are cathode biased. When you change your power tubes or as they age you need to look at the boas. With tube amps, the small signal tubes, like the ones in the pre-amp are self biasing. Occasionally the bias needs to be adjusted as the amp ages.

Bias guitar amp