PAM127E Upgrade to AR coated sapphire crystal

[yogi]

I have just received my fiddy with Upgrade to AR coated sapphire crystal it seams to have a lot of distortion in the crystal. Is this normal ??

I have done the sapphire crystal water test and compared to my gen sub looks like mineral is there any other way I can test to see if I got what I paid for

Thanks

[Sweattdogg]

Is the distortion in the crystal or in the way the dial looks when viewed through the crystal? I have sapphire on my fiddy and it creates a heavy distortion of the numbers of the dial when held at angles and especially around the edges. This distortion is consistent with the gen. Besides the water test, I dunno of any other in-home methods to check the crystal. I would think that anything that is AR coated would have started as sapphire.

Edited November 26, 2007 by Sweattdogg

[yogi]

The the distortion in the dial viewed through the crystal

[Sweattdogg]

Sounds normal to me and also consistant with the gen. As far as what the crystall is made of, I would guess if you bought it here on the forum and the seller is reputable, then it will be sapphire. There are devices which I have seen that tell what kind of crystal it is, but I don't know where you would even start to look for one of those.

[HauteHippie]

The Fiddy crystals have a large curvature and typically distort the dial around the edges.