Tube advice - Cornell 18/20

Discussion in 'Amps and Cabs' started by coolhand78, Jun 1, 2015.

  1. coolhand78

    coolhand78 Supporting Member

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    Recently collected a cornell 18/20 and I'm thinking about changing out the JJ and EH tubes that it has in it.
    I've got a box of old RCA 12AX7's, Mullard CV4024's, JAN Philips 5751's, a Philips 5V4GA rectifier...

    Obviously, I'll need to get some new EL84's but which do you guys reckon would be best to try in my new amp...?

    also, is there any way of knowing if my old tubes are any good still...?
     
  2. DaveKS

    DaveKS Member

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    Unless you got a tube tester only tester you have is the amp. Try the RCA and 5751. Cv-4024 might be good thing in v3 if you want to tame and smooth out the power section, it's one of the best 12at7 ever made. Wouldn't try it in v1-2 though, they (12at7) always sound off in preamp tube slots designed for 12ax7 to my ears. To harsh and strident, but it won't hurt to try it, you may like it, but I don't in most amps I've tried.

    So what JJ are we talking here, the dull as mud ecc83 or the chimey lower gain ecc803?
     
  3. coolhand78

    coolhand78 Supporting Member

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    the amp has only 2 x ECC83, 2 x EL84's & a GZ34 rectifier, but it has a switch for SS rectification which grants 2 extra watts...
    though, i think i prefer the saggier 18 watt tube rectified setting.
     

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