Output transformer question
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 18th November 2011, 10:47 AM #1 woody diyAudio Member   Join Date: Jan 2002 Location: Tyrone Ga. U.S.A. Output transformer question I have a small amp using the 6c45pi. The output transformer has 4 and 8 ohm taps but I am considering hooking a 32 ohm speaker to it. Assuming I am getting 1w into 8 ohms what should my output be into 32 ohms.
 18th November 2011, 09:16 PM #2 payitforwardeddie   diyAudio Member   Join Date: Feb 2011 Location: South Wales, UK 1w into 8 ohms needs 2.8volts. 2.8 v into 32 ohms gives 1/4 watt. Power = volts x amps Power = volts squared divided by resistance Power = amps squared times resistance
Gilgy
diyAudio Member

Join Date: Oct 2009
Quote:
 Originally Posted by woody The output transformer has 4 and 8 ohm taps but I am considering hooking a 32 ohm speaker to it
Why?

aardvarkash10
diyAudio Member

Join Date: Mar 2007
Location: Auckland, NZ
Quote:
 Originally Posted by payitforwardeddie 1w into 8 ohms needs 2.8volts. 2.8 v into 32 ohms gives 1/4 watt. Power = volts x amps Power = volts squared divided by resistance Power = amps squared times resistance
disregarding the shift in the operating point of the output tube due to the change in the reflected impedance...
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 19th November 2011, 01:10 PM #5 DF96   diyAudio Member   Join Date: May 2007 Yes, it all depends on the output impedance (which is the triode anode impedance transformed by the transformer). Without knowing this you can't do an exact calculation. However, some reduction in output power is likely.

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