Audio Related Topics

Reason for the join, is this forum was mentioned to me from DIYAudio.com, where I posted for some help on a Carver A-220 and setting the bias. A friend found a working, decent condition A-220 at an Estate sale and asked me to look it over before he hooked it up to any speakers. It all checks out, all original (it appears), except for a 14-gauge plug, although it's still only 2-prong. Like I said, it works (listening to it as I write this post) and sounds great. I only want to check what the Bias procedure is, because when I check the voltage over the emitter resistors I get 0-1mV and the heatsinks are barely above room temperature after 2 hours of playing music. I would expect there to be 10-20 degree rise over ambient after that long. So mainly want to see if this design requires special bias procedure, and what the voltage measurement at what points is correct for factory spec. Thanks and appreciate any help or comments.

Hey everyone - glad to be a part of the community. Looking forward to reading through some of the posts and getting more knowledge of amplifiers and circuits. Build and repair amplifiers (notice I didn't day design) for almost 6 years now, which started with designing and building speakers about 15 years ago.

Larry Clinton Heart And Soul (1938)

Artie Shaw Goodnight Angel (1938)

Benny Goodman Don't Be That Way (1938)

Larry Clinton Cry Baby Cry (1938)

Fred Astaire Change Partners (1938)

The Andrews Sisters Bei Mir Bist Du Schoen (1938)

Chick Webb A -Tisket A -Tasket (1938)

Jo Stafford You Belong To Me

Sammy Kaye All Ashore (1938))

Shep Fields With Bobby Goday Whistle While You Work (1938)

Sammy Kaye Rosalie (1937)

Bunny Berigan The First Time I Saw You (1937)

Russ Morgan The Dipsy Doodle (1937)

Tommy Dorsey The Big Apple (1937)

Guy Lombardo It Looks Like Rain In Cherry Blossom Lane (1937)

Jeannette Macdonald & Nelson Eddy Indian Love Call (1937)

Tommy Dorsey In The Still Of The Night (1937)

Tommy Dorsey If It's The Last Thing I Do (1937)

Billie Holiday I've Got Mu Love To Keep Me Warm (1937)

Blues Traveler Fledgling

Tommy Dorsey I'm In A Dancing Mood (1937)

The Penguins Earth Angel (1949)

The Platters Smoke Gets In Your Eyes (1959))