Greetings - Watt Calculation

[Guitardo]

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

 

[aardvarkash10]

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...

 

[Ty_Bower]

Let's Google it...
http://www.theused.com/manuals/stromberg/stromberg_au-29.pdf

Stromberg Carlson, model AU-29. Single ended 6L6, 6 watts output power at 5% distortion.

 

[TheGimp]

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.

 

[Guitardo]

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