2. amps-preamps
  3. 1278656674

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 7 responses by vinhusc

vinhusc OP
11 posts
 
Cmalak, I have them about 4 months in my LP-140M. and all the tubes is very very good when tested with TV7 tube tester.

CJ tech (Ed Deitemeier) told me: do NOT substitute any 6922s for the factory supplied tubes (that is Electro-Harmonix) ... it's suck since I do NOT like Electro-Harmonix at all.

They do have 4 screwdriver to adjusting 6550 output tube bias, but NOT for the input driver tube (which is 6922). Is there anyway to bias/setting these driver/input tube?

Thanks
vinhusc OP
11 posts
 
Rleff, both of them but after few months now only 1 side!

They not happen all the time. Sometime I power ON about 2-5 minutes you should hear big crackle/pop and after that is good!
Yes, my friend TV7 tube tester is good.
vinhusc OP
11 posts
 
Samhar, I did but seem like C-J design their powerAmp to used with Electro Harmonix.
vinhusc OP
11 posts
 
Noh, it's impossible because CJ is very conservative and my dealer told me that they will NOT going to do any modification on my amp.
Well, I'm giving up and looking for the other PowerAmp!
vinhusc OP
11 posts
 
Thank you so much for all of you guy info.

Personally I do NOT like anything make in Russia or China. However, CJ designer do believed: There is NO better tubes available to improve the sonic performance for the CJ LP140M !!!????!!! I do NOT agreed with them about this and I have to switch the others gear.

My system: Sonus Faber Guarneri Memento spk with REL B2 Sub, MBL 5011 PreAmp, Weiss Medea DAC, Esoteric P-05 CD Transport.
vinhusc OP
11 posts
 
Thank you so much for all of you guy info.

Personally I do NOT like anything make in Russia or China. However, CJ designer do believed: There is NO better tubes available to improve the sonic performance for the CJ LP140M !!!????!!! I do NOT agreed with them about this and I have to switch the others gear.

My system: Sonus Faber Guarneri Memento spk with REL B2 Sub, MBL 5011 PreAmp, Weiss Medea DAC, Esoteric P-05 CD Transport. and IsoTek Sigma GII Power Conditioner.

Believe me, I've already spend so much money on my stereo system and I can NOT let any junk stuffs degrade the system.
vinhusc OP
11 posts
 
Good news! Conrad Johnson just call me and ask the sent my LP-140M for them to update the circuitry for the driver input... so I be able to run any kind of 6922 tubes in my PowerAmp.

They claim that their design was optimized for the used of Electro-Harmonix! ... sound silly to me.
More to discover