[systemerror909]

I'm anxiously awaiting the arrival of a Little Dot mk III and had sort of a stupid question relating to tubes. Are all tube amps biased to be in class A? or can they be class AB, or just B like transistors? Does my amp run in Class A? Just wondering, this will be my first piece of tube gear.

 

[amb]

A vacuum tube (as an amplification device) is not that fundamentally different than a transistor in its basic operation, so all the various classifications (class A, B, etc) also apply. The specific class a particular amp operates in depends on the topology as well as the operating points (biasing).

 

[003]

What class do the singlepower amps operate in? I notice most headphone amps don't advertise what class they are.

 

[d-cee]

Quote:

Originally Posted by 003 /img/forum/go_quote.gif What class do the singlepower amps operate in? I notice most headphone amps don't advertise what class they are.

I believe Singlepower's amps are OTL

IIRC believe all OTL amps are class-A

 

[amb]

OTL = Output Transformer-Less
It just means that the amp was designed not to use an output transformer. That doesn't necessarily imply class A.

I don't know whether SinglePower amps are class A or not.

 

[tourmaline]

mostley they are biased in class a.

SET single ended triodes amps have in general lower wattage between 5 to 30watts max.

Push pull design has at least 2 output tubes and can optain output over 100 watts.

Also read this:
everything you want to know about tubes and tube amps.

http://www.head-fi.org/forums/showpo...67&postcount=3

 

[d-cee]

hmm

maybe i have my wires crossed??

are all SET amps class-a

i remember there was a particular type of amp that is always class-a =S

 

[amb]

Yes, SET is always class A, so are their transistor counterparts.