ttrhp Posted May 1, 2006 Share Posted May 1, 2006 hey guys, The 6ca7 on my welborne laurel are getting weak and I am going to replace it with a new pair.when i search on ebay for 6ca7 and almost all the tubes that pop up are 6ca7/el34..when i replace the 6ca7 with golden dragon el34,there no sound comming out of it at all,so the question is.Do I have to adjust anything in the amplifier when i replace the 6ca7 with EL34?..thanks Quote Link to comment Share on other sites More sharing options...
DRBILL Posted May 3, 2006 Share Posted May 3, 2006 The 6CA7 is in every way the same as the EL34. Try exchaning the two tubes and see if the problem follows the tube. It is not unheard of to get a new defective tube. Sometimes, the wire to a tube pin isn't soldered. You can fix that by heating the pin with your soldering iron and flowing some solder into the hollow pin. Also, I have found that many "Eastern" newly manufactured tubes have pins that are slightly smaller than the NOS equivalent. If you find that to be the case, you can use a dental pick to"unspread" the socket contacts. Finally, there is the possibility that your tube sneaked pass QC. DRBILL Quote Link to comment Share on other sites More sharing options...
DRBILL Posted May 9, 2006 Share Posted May 9, 2006 By the way. I wouldn't buy tubes on E-BAY. There is no telling what you are going to get. There are a number of excellent NOS vacuum tubes dealers that will stand behind their wares. My favorite is www.vacuumtubes.com Michael Marx is an encyclopedia of tube information and he keeps an unbelievable inventory. And he ships the same day. DRBILL Quote Link to comment Share on other sites More sharing options...
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