Old Amps that can still Kick Butt


Not being a believer that time necessarily = progress, I would like to offer the following example of a sonic gem that has transcended time and can totally kick butt in a modern milieu:

The Robertson 4010. I got one of these about two years ago because it was in immaculate condition, the price was so low and I was inquisitive. I hooked it up and let it warm up for a couple of days. OMG this thing was in the super amp league: Transparency to die for, slam that you couldn‘t‘ believe for for a 50W amp.. Peter Moncrieffe wasn‘t wrong in his review of this amp: this thing is in the Sterreophile Class A component category hands down. Even after all these years.

What amps have you encountered that have defied time and can still kick butt today?


128x128pesky_wabbit
roxy54, a courteous and well reasoned reply; thank you! I hope you do get to hear the new breed of class D. 

Briefly, I distinguish between the myriad of tweaks outside the signal path, and products/methods that touch the power and signal paths. I am unusual in the industry, as I recommend the proper way to use and assess cabling is with entire looms/sets from the manufacturer. So, my comments on cables are almost always in the context of that methodology. 

To that end, I have found the efficacy of aftermarket cables to be not debatable when used in sets. I also consider them a component as such, and continuously in personal listening and reviewing they confer as large changes as components - again, when used in sets. Changing a cable here and there ad hoc without a thorough understanding of the manufacturer's intended sound is largely fooling around, a waste of time in that it yields no direction to push the system toward a desired result. 
That use of cables is very much like using tweaks; no directivity and nothing more than hopefulness of a good result. 

If you have not yet worked with aftermarket cables, I encourage you to read my reviews of cables, wherein I explicate my methods. You would perhaps enjoy my latest review of the Iconoclast Cables published at Dagogo.com. For someone who is not yet ready to trust the system, to part with more significant numbers of dollars to test it out, the Iconoclast Cables are ideal, because they use the same geometry, AWG, etc, but with a different conductor for each level of performance. That is not very common in the HiFi cable industry.  
@knotscott
That’s a great story. Mr Rosenberg addressed the Phila Triode Symposium dressed in a full Native American feather headdress that sported a vacuum tube as the keystone of his feather headdress and an Irish kilt. There were many other Audio heavyweights there in the audio press as well as amp designers.

We listened to 8 different SET amps using 300Bs, 845s, 211’s, and 2A3s with a CAT SL1 preamp, the $5K Sony SACD player & 104 dB Classic Audio Reproductions horn speakers with Goertz Alpha Core IC’s & spkr wire. My favorite amp was the lowest powered & least expensive Fi 2A3 monoblocks. Other amps included a 300B SET Prototype by David Berning, Komuro 845 monoblocks, a 110 Lb 211 amp by Wyetech Labs, Caztech Audio 300B amp, Bel Canto, Cary and Audio Note 300B amps.

I took my username from that show that made such an impression on me.

Interestingly, Harvey Rosenberg years later wrote an article in Listener magazine touting 4 pin true triode tubes run in Push Pull Triode as being far superior sonically to SET Amps.
I'm still running my SAE Mark III CM amps. And thankfully I've found a great place to keep them in great shape.


Would love to compare a Pass Aleph3 (1999) and a Pass XA25 or 30.8 (2020). I wonder if there is much audible difference on a revealing system for these amps of similar output.