Mc 240 vs. Prima Luna

It’s pretty simple, NONE of the Macs sound worth a crap in Mono, Even built to be just mono. I tried a few times with mods and a few different thing. Nothing could get close to the sound of a Samra MC240 in dual mono or stereo mode.

The problem I have with most rebuilds on 240s is the cheap polly caps (yellow) that Mac NEVER used. It just kills the way a 240 sounds.. It takes paper and oil caps a few carbon comp resistors checked/swapped and a PS upgrade.

Don’t compare a yellow polly rebuild to a proper PIO rebuild.

Surplus Russian PIO KY44 and 77s will last 50 years if they last a day and sound better than the old bumble bees, (not the black beauties). Compaired to the pollies there is just something missing in the mids and they change the way my ribbon tweater sound. I’ve used the same types of drivers for a lot of years, 70s I don’t change. Small ribbons and planars.

You want 75-85 watts per channel use a MC275 and get REAL happy. It will blow the doors off a 240 and as for the Raven, I’ve never heard one. I’m sure it’s well built. It’s also 20 watts per channel. Apples Oranges. I’d doubt VERY much it would sound better on the Hershies. At least VS my MC240s.

61-70 MC275 you can get close to 90 watts per channel and a MAC sound.. It’s like no other with a set of GOOD 6550s or GL (type) KT88 and Telefunken valves Nothing sounds like that. It’s a Macs.. Again PIO and keep the Black Beauties, check the resistors and there are 4 you need to change and a PS upgrade.. 90 watts per channel.. Good bass! LOL better than anything mentioned here.. WAY better..

The cool thing would be to run a good 240 for the mids and highs and a 275 for the bass, If they are bi ampable.. THAT will really get LOUD and VERY clear..

You want to LOOK really cool get a MC225 TOO.. :-) I line mine up all pollished and I get happy. MC225, 240 and a 275 on a white tile counter top in the kitchen, (I built it too.:-)) is a pretty cool picture..

50 years with Mac, I love um’

Doubling up your existing amp will not gain much. You'll have the same sound and 3db more power, just not worth the trouble. Although mono-blocks are better than stereo amps, bridging a stereo amp is not the same thing as a pure mono-block amp. A Prima Luna and perhaps some tube rolling would keep you busy for a while. 

I disagree that doubling up the current tube amp won’t gain you much. I have a pair of VAC 200iQ tube amps, and running mono is a clear and significant improvement over a single amp in stereo mode. I have 96dB / 8 ohm speakers, so the increase from 100 Watts/ch to 200 doesn’t seem like it should be meaningful. But very clearly, the pair of mono amps is much better - and it’s not always just about raw power, anyways. Also heard this same effect with the same amps in my friend’s system. And 3dB is a LOT, when you’re near your preferred listening volume in a familiar system and you’re an audiophile. "3dB isn’t much" is good forum fodder for the HT guys.

With op going from 40 to 80 watts, I’d be surprised if the improvement isn’t significant. I’d stick with the McIntosh plan.

I am a PL integrated owner for almost three years. I have used tube amplification for decades. This is the best tube amp I’ve ever owned in terms of musicality and ease-of-use. What’s especially appealing is the auto bias, ability to change power tubes for your sonic preference and the amp will shut off if one of the power tubes red plates or gets funky. To me, those features eliminated a lot of the hassle of owning a tube amplification system. I also like the sound presentation which is tonally dense with great ambience and dynamics. The power tubes can change the sonic presentation from lush and warm to robust, fast and very transparent (EL 34 versus KT150) I would say the Macintosh brand has a very appealing type of case work with its blue meters and the PrimaLuna cannot match that if that is important to you.

This model of McIntosh doesn't even have the blue meters lol. And considering non-sonic attributes, the McIntosh amps will hold value a hell of a lot better than Prima Luna. They'll basically never go down.