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Need help C-J monoblock LP-140M with Siemens CCa

I am new to the tubes world and this is the first time ever I have tubes power amp in my audio gear.

I have been used 3 different sets of NOS/NIB Siemens CCa tubes in my Conrad Johnson LP-140M amplifier, and all have started to fizzle, crackle and/or pop within a few days.

Just curious if others have had this problem? My dilemma is that I like the sound of these CCa tubes, and don't like any junk tubes (Electro-Harmonix was supply with the Amp from C-J factory) in this amp. I don't believed they sound nearly as good as Western European make tubes.

I have hear about Ediswan CV2492 from UpscaleAudio.com, is it really equivalent or better than (Siemens, Telefunken or Valvo) CCa?

Thank you so much for all your feedback and/or suggestions for alternative tubes.
vinhusc

Showing 1 response by myles_b_astor

myles_b_astor's avatar
myles_b_astor
134 posts
 
Vinhusc is right. Got the same dirt straight from the top. For some reason, the 140M amplifier is more sensitive to the choice of driver/input tube than is the 275M. In fact, Lew said use of other tubes could damage the 140M. And in fact, they carefully match all three tubes and tell you to only use them in the positions indicated.

So caveat emptor.
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