Wow! Great info! I had no idea that the size of the cabinet/tighter tuning would help protect the Valencia's woofers and I never realized that the fact that they're 16 ohm compared to the Model 19 being 8 ohm would be a significant factor as well. As far as the diaphragms, I believe they are original since I bought the Valencias from my older brother who owned them since the 70's and he bought them from the original owner who only used them for his home stereo. BTW, here's a close up of one of the 806A's (date code from October 1969--hmm, the Beatles were still together--cool!)--both 806A's have that same date code.
http://www.hostboard.com/forums/hbmc.../2010/08/9.jpg
Seems like it's pretty much unanimous that Model 19's are not suited for PA--not even just for (at home) band practices. I'm glad I asked--I'm not going to buy a pair for my PA. I've been using the Valencias with success for quite a while now--as I mentioned they have the exact same drivers and horn as A7's from 1966 (http://www.lansingheritage.org/image...vott/page6.jpg --the 806A driver, 811 horn, 416 woofer) and have held up great/still sound great. We sometimes crank up a CD through the PA when we're taking a break at band practice and CD's sound crystal clear/clean through them (nice tight/clean low end/crisp highs) as well as the vocals, guitars, and keyboards that we crank through them during practice. I'll stick with them rather than blow up an innocent pair of Model 19's. I'll keep using the 19's that I currently own for my home stereo only--they've never been used for PA.
BTW, even though it is a rock band (and our practices would be considered pretty loud to many non-rock musician's ears), we are careful at practice and only turn up the PA and other instruments loud enough to be heard over the acoustic drum kit (we don't mic. the drums at practice--not even the kick drum). We use high quality vocal microphones (uni-directional) and never crank them loud enough to feedback. We also never put bass guitar through the Valencias although some of the keyboard patches have nice deep bass to them......
I'm a huge King of the Hill fan--a lot of people didn't know that Tom Petty was the voice of "Lucky" on King of the Hill--Luanne's boyfriend (R.I.P. Brittany Murphy--voice of Luanne).....
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Below are my home stereo speakers that you guys just saved--never been used for P.A. and never will be. (click on images to enlarge) Thanks again everyone.....
http://www.hostboard.com/forums/hbmc...2010/03/12.jpg

