Bulbs blowing out

Just wondering if anyone has experienced this? I have a Beseler 23CII and had to replace a bulb yesterday that was about one year old, and now today I have to replace the replacement. The bulbs are GE PH/140 75W. Did I buy bum bulbs or is there something with the enlarger that I need to check? Thanks for any help!

Blessings, K

I have an older 23CII, and it uses the 75W PH111A. Are you sure you're using the right bulb?

resummerfield said:

I have an older 23CII, and it uses the 75W PH111A. Are you sure you're using the right bulb?

Click to expand...

I believe so, my enlarger also says to use the PH111A, but that bulb is way too small to fit the enlarger's light socket, the photo dealer said that they changed the size and socket, and the PH140 is the one that fits. But thanks for responding!!!

Blessings, K