Finally found some info on the unit.

Diyaudio has a section from LazyCat (designer) and states 250 W and 16 Amp continuous current. They do state it as a class A/B.

Max Power 8 Ohm 150 Watt 0.05 THD

Max Power 4 Ohm 230 Watt 0.05 THD

Bandwidth 3 Hz to 3 MHz (-3dB)

THD 0.0034% (100 Watt)

IMD 0.003%

SNR 110 dB

Input Impedance 10 Kohm

Damping Factor >2000 (4 ohm)

Year Introduction 2014

Does continuous current mean class A? And am I right assuming it's 75 per channel into 8 Ohm?

Hi Don,

Describing is rather difficult, but I will try to be as clear as possible. Please bear with me.

Yes, 75 watts per Push Pull channel into 8 ohms, the current flow is ~3.06 amps per channel.

Times two channels is 6.12 amps.

Per the designer's comment 250 watts/channel rms into 4 ohms, the current flow is ~7.9 amps rms.

Times two channels is 15.8 amps rms. He is stating the power supply can power both channels to

the max without an "unscheduled disassembly" of itself.

However, what determines whether operation is Class A or Class AB is determined mainly by the

output devices and device parameters chosen (although the power supply has to be designed to power

whatever Class is chosen). (Collector voltage, bias current etc etc)

Since Class A is so inefficient, even 16 amp current rating would not provide 250 watts output

into 4 ohms. Theoretical maximum efficiency is 50%, but figure 30% plus/minus.

Operating Push Pull AB is interesting as, depending upon the idle bias, both transistors (tubes)

operate Class A over a range of X few output watts before each transistor starts to shut off over a

portion of the waveform/cycle. At that point, AB operation commences. Class A X power output depends

upon the idle current (with no signal), size of the device(s) etc etc.

Sometimes I am not very clear, but hope this helps some Don.

steve