OTL amps, my pick for the tube used.

If you look at their website, they claim 100 watts into 8 ohms and 150 into 4. So I am assuming that ’100 amps’ is a typo, not uncommon on the web

Hi Ralph,

What amplifier are you referring to? What I was pointing out is that George’s statement about 100 amps referred to the solid state ME 1400 and ME 1500, which are not the amp referred to in the OP. And the ME 1400 and ME 1500 are specified as being far more powerful than 100 and 150 watts into 8 and 4 ohms, respectively. And what I was pointing out was that (a) the power ratings of the ME 1400 and ME 1500 into 2 and 1 ohm loads are not consistent with what appears to be the rating of their mains fuses; and (b) the 100 amp maximum continuous "output current" specification of the ME 1400 and ME 1500, even if accurate, would only apply in the case of absurdly low load impedances and is therefore not relevant to any real world usage of those amps. As I’m sure you agree.

Also, I couldn’t find any detailed specifications for output power or anything else for the OTL-150 at the Navison site (just some references to "coming soon"), although that has no relevance to my posts in this thread.

Best regards,
-- Al

Just to be clear, that’s 100 **watts** not amps, per the manufacturer’s website. With 150 watts into 4 ohms, that’s about 6.2 amps total. Our MA-2 can do more than that.

Hi Ralph,

Before George points it out, the datasheet shown at the second link in his last post does in fact say "output current: 100 amps (continuous)," for the ME 1400/ME 1500 amplifiers referred to in that post (as opposed to the OTL amp referred to in his OP).

However, as best as I can tell from some somewhat blurry rear panel photos I found on the net there is a 5 amp fuse located immediately adjacent to the ME amp’s pendant power cord. Assuming 240 VAC (as is used down under) that would correspond to a maximum AC input of significantly less than 240 x 5 = 1200 watts, assuming reasonable derating of the fuse. Which in addition to calling into question the specified "typical" output power capabilities (e.g., 800 watts per channel into 2 ohms and 1500 watts per channel into 1 ohm, these figures stated to be "continuous and with both channels driven"), would mean that 100 amps could be continuously supplied into a load impedance of no more than 1200/(100 x 100) = 0.12 ohms. And actually much less impedance than that, given reasonable derating of the fuse and reasonable efficiency assumptions, and if two channels are to be driven.

In other words, a usage scenario that would never exist in practice.

Best regards,

-- Al