ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
previous: Bill I'm working on a sf twin (with the ... -- 2/11/1998 1:54 PM View Thread

Re: SF Twin

2/14/1998 4:05 AM
Jim S.
email
Re: SF Twin
Are you sure that amp is drawing 2 amps at idle? This seems REALLY excessive! Even if all 4 power tubes were idling at maximum plate watt dissipation levels (30 watts per 6L6 = 120 watts total), that would account for only about 1 amp of the total AC line current draw. The rest of the amp circuit (filaments + preamp tube plates + resistor losses + power transformer losses) couldn't possibly account for the other 120 watts in normal situations.  
 
Either you measured the AC current draw incorrectly or there is a major problem/current leakage in the amp.