How big is the difference ?.

[Sylvester]

You can feel the quality difference in your hand ; it will run cooler and will have more power. The 1940's are comparable to size with the XL's ~ the 1950's are a bit longer than the XL's.

[rchippie]

Originally Posted by Sylvester

You can feel the quality difference in your hand ; it will run cooler and will have more power. The 1940's are comparable to size with the XL's ~ the 1950's are a bit longer than the XL's.

I sure the qualitly is better, i was really looking for a somewhat detailed performance report if thats possible . also are the endbells screwed on or do i need a clamp ?.

[starscream]

I'm not positive about the attachment of the Lehner end bell.

The length of the XL is only 2mm shorter than the 1950
The length of the 1490 is 6mm shorter than the XL

I believe the Lehners are around 90% efficient where the XL's are around 80% efficiency