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I think you may not be factoring in the efficiency of the amplifier. Which is something around 50% typically. That efficiency is the difference between the amperage required between the VA of the output power and the required amperage for the amplifier to produce that output power. The primary input current will always be about 150%(+/-) of the output power, depending on how efficient the amplifier is. There's no direct relation between primary input current and the current required for the output, at least no always the same relationship, which is due to peculiarities of construction, design, and probably the color of the cabinet (yeah, right, color of cabinet).
That 150% is a fairly good guess, ball-park anyway. Then, when you start figuring on the amount of current supplied by the primary source, you get to figure in that source's efficiency! ICS versus CCS for power supplies, meaning bigger than what you'd expect.
Does that help any?
- 'Doc

PS - That 150% thingy is just a marginal guess. 175% would be a much safer guess. Too much, more than likely, but certainly doesn't hurt.

<blockquote data-quote="W5LZ" data-source="post: 155551" data-attributes="member: 129">I think you may not be factoring in the efficiency of the amplifier.&nbsp; Which is something around 50% typically.&nbsp; That efficiency is the difference between the amperage required between the VA of the output power and the required amperage for the amplifier to produce that output power.&nbsp; The primary input current will always be about 150%(+/-) of the output power, depending on how efficient the amplifier is.&nbsp; There&#039;s no direct relation between primary input current and the current required for the output, at least no always the same relationship, which is due to peculiarities of construction, design, and probably the color of the cabinet (yeah, right, color of cabinet).That 150% is a fairly good guess, ball-park anyway.&nbsp; Then, when you start figuring on the amount of current supplied by the primary source, you get to figure in that source&#039;s efficiency!&nbsp; ICS versus CCS for power supplies, meaning bigger than what you&#039;d expect.Does that help any?&nbsp;- &#039;DocPS - That 150% thingy is just a marginal guess.&nbsp; 175% would be a much safer guess.&nbsp; Too much, more than likely, but certainly doesn&#039;t hurt.</blockquote>

[QUOTE="W5LZ, post: 155551, member: 129"] I think you may not be factoring in the efficiency of the amplifier. Which is something around 50% typically. That efficiency is the difference between the amperage required between the VA of the output power and the required amperage for the amplifier to produce that output power. The primary input current will always be about 150%(+/-) of the output power, depending on how efficient the amplifier is. There's no direct relation between primary input current and the current required for the output, at least no always the same relationship, which is due to peculiarities of construction, design, and probably the color of the cabinet (yeah, right, color of cabinet). That 150% is a fairly good guess, ball-park anyway. Then, when you start figuring on the amount of current supplied by the primary source, you get to figure in that source's efficiency! ICS versus CCS for power supplies, meaning bigger than what you'd expect. Does that help any? - 'Doc PS - That 150% thingy is just a marginal guess. 175% would be a much safer guess. Too much, more than likely, but certainly doesn't hurt. [/QUOTE]

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