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26th November 2009, 01:41 AM
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#1 |
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diyAudio Member
Join Date: Nov 2009
Location: Kansas
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Greetings - Watt Calculation
Hello fellow DIYers. This is my first post here after reading extensively. I have a few questions I was not able to find answers to using the search feature. I'm curious to know if there is a calculation I can use to figure how many watts my amplifier is. The scenario goes like this...I bought a beat up old Stromberg Carlson PA amplifier chassis many moons ago. It's a (pot dating) 1946 AU 29. I have just finished replacing all the caps. I'm ready to go get a speaker for this thing and I'd like to know what power rating I should be looking for. On the stamped plate at the back of the amplifier it states:
Stromberg-Carlson CODE NO: AU 29 A.C. VOLTS 105-125 CYCLES 50-60 MAX. WATTS 80 Is that telling me that this thing outputs 80 watts?! Paul |
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26th November 2009, 02:00 AM
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#2 |
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diyAudio Member
Join Date: Mar 2007
Location: Auckland, NZ
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no, its not. It s telling you in consumes 80 watts. You would need ot know the B+ voltage and tube idle current as well as configuration (SE or PP) to get a "close enough" output figure...
__________________
Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012 |
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26th November 2009, 02:12 AM
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#3 |
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diyAudio Member
Join Date: Mar 2007
Location: Newark, DE
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Let's Google it...
http://www.theused.com/manuals/strom...berg_au-29.pdf Stromberg Carlson, model AU-29. Single ended 6L6, 6 watts output power at 5% distortion. |
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26th November 2009, 03:26 AM
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#4 |
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diyAudio Member
Join Date: Aug 2009
Location: Johnson City, TN
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I'm only getting 6W out of my 6P1P-EV PP right now and it is LOUD! driving 89dB/W-m speakers. (I'm targeting 12W just because I don't think I'll make it.)
Don't let the small numbers fool you. A 6 W amp can make some nice volume with the right speakers. |
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26th November 2009, 09:13 PM
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#5 |
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diyAudio Member
Join Date: Nov 2009
Location: Kansas
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Thank you everyone! That's great information and I'm well on my way. I have a 1953 Gibson GA-20 that is my workhorse everyday amplifier and it's getting abused from travel. It's only about a 14 watt amplifier, but that's fine by me. I always mic my amplifer, so volume isn't a big issue.
Paul |
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