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Amperex tubes are very good.....at least they were when I used them in broadcasting applications.I used to use 807's and 833C's in 1 Kw AM broadcast transmitters and they worked great. Later when they became hard to get and much more expensive we switched to Chinese made National brand tubes and noticed a definite decrease in lifespan. Amperex was made in France to original Phillip's specifications. Not sure what they make for tubes now and IIRC there are/were a lot of new old stock Amperex on the market. I personally would prefer the Amperex tubes over the Chinese manufactured ones of any brand name. In fact all the tubes made in the same plant in China are sold under several names such as RF Parts, Taylor etc. Supposedly RF Parts picks the better tubes and sells them under their own name. They still seem inferior to Amperex tubes however.

Again, any tube with the number 3-500XXX is electrically the same and will work. The differences are in the construction and durability. with the ZG type having the more rugged graphite anode (plate).

<blockquote data-quote="Captain Kilowatt" data-source="post: 512627" data-attributes="member: 39">Amperex tubes are very good.....at least they were when I used them in broadcasting applications.I used to use 807&#039;s and 833C&#039;s in 1 Kw AM broadcast transmitters and they worked great. Later when they became hard to get and much more expensive we switched to Chinese made National brand tubes and noticed a definite decrease in lifespan. Amperex was made in France to original Phillip&#039;s specifications. Not sure what they make for tubes now and IIRC there are/were a lot of new old stock Amperex on the market. I personally would prefer the Amperex tubes over the Chinese manufactured ones of any brand name. In fact all the tubes made in the same plant in China are sold under several names such as RF Parts, Taylor etc. Supposedly RF Parts picks the better tubes and sells them under their own name. They still seem inferior to Amperex tubes however.Again, any tube with the number 3-500XXX is electrically the same and will work. The differences are in the construction and durability. with the ZG type having the more rugged graphite anode (plate).</blockquote>

[QUOTE="Captain Kilowatt, post: 512627, member: 39"] Amperex tubes are very good.....at least they were when I used them in broadcasting applications.I used to use 807's and 833C's in 1 Kw AM broadcast transmitters and they worked great. Later when they became hard to get and much more expensive we switched to Chinese made National brand tubes and noticed a definite decrease in lifespan. Amperex was made in France to original Phillip's specifications. Not sure what they make for tubes now and IIRC there are/were a lot of new old stock Amperex on the market. I personally would prefer the Amperex tubes over the Chinese manufactured ones of any brand name. In fact all the tubes made in the same plant in China are sold under several names such as RF Parts, Taylor etc. Supposedly RF Parts picks the better tubes and sells them under their own name. They still seem inferior to Amperex tubes however. Again, any tube with the number 3-500XXX is electrically the same and will work. The differences are in the construction and durability. with the ZG type having the more rugged graphite anode (plate). [/QUOTE]

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