Determine output power

Double-Bubble! Place for discussing the 36W version...

Moderators: CurtissRobin, colossal, zaphod_phil, Daviedawg, Graydon

User avatar
Super Duper Admin
Super Duper Admin
Posts: 2938
Joined: Tue 09/18/12 8:00 pm
Location: South Central, MA

Re: Determine output power

Post by JMPGuitars »

TriodeLuvr wrote:
Tue 05/04/21 1:48 pm
The schematic for the 18 Watt Tremolo TMB indicates the EL84s are biased to about 12V. That means a 24V pk-pk signal at each grid will drive it to full output. A 6J6 would hardly know it's working! :)

With the bias voltages quoted in those docs, the tubes are biased at 85%. Obviously you would want to bias alternative tubes appropriately.
0 x
'I installed a skylight in my apartment yesterday... The people who live above me are furious.' - Steven Wright

Modern Ground Schemes
Soldering Technique
B+ Voltage Reduction

Web Design:
Guitars / Amps / Effects:
(anti)Social: Facebook · Instagram
Items for Sale

Frequent poster
Frequent poster
Posts: 908
Joined: Mon 12/10/07 2:00 am
Location: Melb, Aust

Re: Determine output power

Post by katopan »

zaphod_phil wrote:
Tue 05/04/21 9:31 am
In my opinion, measuring the clean power output of a rock guitar amp is a waste of effort. The main reason we buy or build these amps is to hear them overdrive into their sweet-spot tones. Their "clean" tones still aren't pure sine wave, but have some distortion. As I've said in other contexts, this ain't Hi-Fi! :P
I somewhat agree Phil. But it's handy to know the ballpark to ensure an amp isn't going to blow up a pair of 60's original alnico speakers I have in my 1x12. I also like having a benchmark reference to compare amps against each other, fully accepting that the actual overdriven dynamic output power is not going to match my theoretical clean value.
2 x

Post Reply