Nos on the way. $700 worth.

[BobW]

That's correct BobW. Amplifiers are (when honestly described) rated at the point just before the onset of crossover clipping. When running full roar in distortion they push far more current and voltage into the load. Try it yourself.

Then your measurements are either flawed or aren't using standard pwr RMS ratings over the frequency response, and all bets are off. Years ago musicians would also claim their 20W amp was rated for 100W, while looking at the convenience socket label.

Marshall, etc would have sold a 70W or even 50W amp that runs on EL84s a long time ago, if it were possible.


(...when honestly described), in you case means you probably didn't measure over the entire frequency response.

Apples vs oranges in your measurement methods.

Peak or instantenous, probably... Prove it to us. Show us the waveforms, running continuously into a dummy load at one hour increments, at fixed frequencies points of 60Hz, 100Hz, 500Hz, 1kHz, 2kHz, 5kHz, and 10kHz.

We'll wait for the results.

[skyboltone]

Bob;
I don't think we're in disagreement here. I am talking instantaneous. I am talking over an extremely narrow range of frequency, I am talking about a very dumb DMM for measurement. My remarks are very general. In SOME SENSE and in SOME PORTION of the bandwidth the DMM comes up with voltage that when applied to P=E^2/R shows about 70 Watts.

Of course it's not RMS at full spectrum, the tubes would incandesce.

Look, I'm glad you're questioning some of my suppositions here because I will gladly kneel at the foot of the theory alter here if we can explain how in normal use, even the very best NOS tubes available, the power stage tubes fry when used in HIWATT, Marshall, and other amps of that kind. (these tubes are rated for 8000 hours at full output) If we run an amp into overdriven power stage amplification we MUST be exceeding design specs. Otherwise we would get that HI-FI Tone. Dumble, by comparison overdrives the pre-amp stages which are resistive coupled and no power (watts) are consumed. Ken Fisher runs the plates of the Trainwreck EL-34s at 410VDC and uses power stage overdrive, but stays within the tube's screen and plate ratings because of the lower voltage. Anyway, stay with it because I want to know.

That's correct BobW. Amplifiers are (when honestly described) rated at the point just before the onset of crossover clipping. When running full roar in distortion they push far more current and voltage into the load. Try it yourself.

Then your measurements are either flawed or aren't using standard pwr RMS ratings over the frequency response, and all bets are off. Years ago musicians would also claim their 20W amp was rated for 100W, while looking at the convenience socket label.

Marshall, etc would have sold a 70W or even 50W amp that runs on EL84s a long time ago, if it were possible.


(...when honestly described), in you case means you probably didn't measure over the entire frequency response.

Apples vs oranges in your measurement methods.

Peak or instantenous, probably... Prove it to us. Show us the waveforms, running continuously into a dummy load at one hour increments, at fixed frequencies points of 60Hz, 100Hz, 500Hz, 1kHz, 2kHz, 5kHz, and 10kHz.

We'll wait for the results.

[Andy Le Blanc]

Pout, peak? pre-clip?...... as long as the math is good..
sometimes the simple tests are a surprise.

I wouldn't be afraid of building that Hi watt, I'd look for a current production type
that would be appropriate for the application and I wouldn't even re-voice.

If a client wants too invest in the rig with NOS, so be it, it's they're dime.

While your in there finding peak Pout at given freq., it's also a good time to
measure Imax so you can grab a figure for the conduction angle.

Nail down where in AB land you really are.