Re: [Harp-L] Harp king question

"Self-bias" refers to cathode bias, not fixed fact no instrument amps 
are self biasing, it's a bit of a misnomer even when discussing cathode bias. 
Total current draw for a Harpking stock is 4.1A, with KT120 it's 4.9A max (0.5A 
less than a Twin for instance), the PT should take it, I have never seen a 100W 
PT with less than 6A of current supply. This is unlikely to drop the B+ current, 
or headroom significantly. Should B+ drop more than 20vdc - at comparable idle 
current (I seriously doubt that this will happen) with the KT120s then it would 
be a good idea to take them out.

From: THOMAS FIACCO <mx714@xxxxxxxxxxx>
To: harp-l@xxxxxxxxxx
Sent: Wednesday, 3 August, 2011 22:38:51
Subject: [Harp-L] Harp king question

Self biased meaning fixed bias ? Yes -KT120 tubes-no. 100ma-300 ma more draw to 
operate is dropping the headroom
too much. Johns e-mail is kinder@xxxxxxxxxxxxxxxxxxxxxx

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