[AngryAlpaca]

Comparably sized? How close are we talking? I can easily understand a BIX being worse, but I have more difficulty with something that's 6*6.

Is it the all copper that makes the Lytron better, or are they brazed? It seems to me that the solder is the weak point in copper/brass heater cores. I see that as being the reason (seeing as aluminum solder is only [and can only be] used in aluminum cores, and that's much better thermal conductivity than lead/tin) that some radiators are better than others.

Edit: Silver brazed. That's where the money goes and that's where the performance comes from (I think)