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Only when the EL34s are in a better amp than my MP-301. In the same amp, the KT150 always outshines the EL34 in a big way. I haven't done a live KT150 vs 300b comparison yet. However, I have also listened to a KT120 vs 300b comparison on Youtube. I couldn't tell the difference through my setup. I'm assuming the difference would be more noticeable with KT150s.

If you heard that, then your assessment is 100% correct. My first and current tube amp is the MP-301 Mark III. It had a great sound with 6L6 and EL34 tubes. However, it really came to life with KT150s. Your observations of KT150s are pretty much the same as mine. I'm getting Quicksilver mono blocks to better accommodate that KT150 sound.

The K-55V will definitely work on the Heresy 700 Hz horn. That's what I had in mine. Crites sells them as the Atlas PD-5VH Alnico Midrange driver. $365/pair. I also got a nice boost in presence, detail and volume from my K-55Vs by swapping out the steel crossover to driver wiring with 10AWG pure copper wire. It actually improved every driver in perfect sonic proportion. Give it a try if you'd like, and share the before and after measurements if you can.

Good work. Materials definitely make a sonic difference. I changed the tin terminals on my 'crossover to driver' connectors with copper terminals for my vintage La Scalas. The sonic upgrade was pleasantly surprising. I need to start taking measurements like yours so I can quantify these experiments.

My Chorus II risers were pretty beat. I replaced them with modern Klipsch solid risers. They actually tightened up the bass very nicely.

Maybe not. Try it and see. As far as paying, you and the seller probably both have Zelle in your bank accounts. It's fast and free. I used it to buy my La Scalas at $600, and they are a work in progress.

Ad title says $600, the actual ad says $800. https://washingtondc.craigslist.org/mld/ele/d/bethesda-klipsch-forte-ii/7480220695.html

For my Heresy I and Chorus II pairs, damping material on the mid horns made a substantial difference for the better. For my La Scalas, not as much. However, when I used the Dynamat brand for damping my La Scalas, the difference was substantial. The off brand I used for my Heresy and Chorus speakers was too thin to make a difference in my La Scala mid horns.

Sorry, I don't have any measuring devices, but I'm sure someone else doing the mod has.

Wow! Never thought about two layers of damping; I've always used one. I think I'll try that on my vintage La Scalas.

Some China amp distributors have inventory in the US. Click around Amazon to see what you can find.

The wait is about six weeks. I definitely prefer the new QuickSilver designs. A DAC with a volume knob would work, but you would probably prefer a preamp if you did an A/B test.

For $1,500, you might consider mono blocks. I have a pair on order myself from QuickSilver Audio. You would need a preamp. Maybe one of your receivers can take care of that. http://quicksilveraudio.com/products/horn-mono-amp/

Sold.

It's a very old mod that works very well. I did it for my Heresy I, Chorus II and La Scala I speakers. Worked every time. I had done all three by the time I saw the Boston Audiophile's video, but everything he says is spot on.

I really liked your video on the mono blocks. It inspired me to order QuickSilver mono blocks; a better way to get my KT150 fix.

I would prefer a newer design as well. However, it really comes down to preference. I had a nice long conversation with Jim at JEM Performance and contrary to my opinion, he prefers the original La Scalas over the latest. They just sound more natural to him. He has years of recording studio experience, and every new Klipsch model on his showroom floor.... yet he still prefers version I. He knows what he likes, and he knows a lot. Can't argue with that.

The modern risers are a nice touch. I installed the same type on my Chorus II pair. They were solid birch, and they really tightened up the bass, giving my Chorus IIs more of a sealed sub sound.

Excellent work! Pics?

I didn't know anything about the audio market or this debate when I did my experiments. I have no reason to change my mind at this point.

A number of forum members have told me their best connectors were no connectors; they just screw bare wire to the crossover board. That makes good sense. It's just that my wires are too fat to screw onto the crossover board, so I opted for copper connectors. They definitely give the current a bit more energy. So today I installed the last of my copper connectors on my crossover to doghouse wires. More tiny improvements that add up to big improvements. My first speaker to amp cables (I'm very new to Klipsch and tube amps), were made from these 10AWG copper cables. I built them for my Heresys. I was also pleasantly surprised at what they did for the Heresy's interior wiring. I'm now on my third Klipsch set, these La Scalas, and I'm getting the same good results. However, my first 10AWG speaker cables sound pretty thin compared to these higher quality audiophile cables. They were only about $50 for a pair on eBay. Over the years I've seen this type of audiophile cable installed for interior wiring among the DIY crowd, and now I know why. I won't be doing that myself, as I have other audio experiments to tinker with. For one, I'm still waiting on my ALK CSW-450 crossovers. We shall see.

These are in nice shape. https://www.facebook.com/marketplace/item/2023803771141295/

Sold.