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-   -   C2300 Tube Test Day (https://www.audioaficionado.org/showthread.php?t=46632)

jdandy 09-08-2019 08:18 PM

C2300 Tube Test Day
 
I test my tubes in my gear once a year, usually in June. I have been a bit lax this year, but today I managed to motivate myself into pulling the C2300 out of the living room rack and testing the 12AX7 tubes in the line stage and moving coil phono stage. I have Gold Lion ECC83/12AX7 tubes in the line stage and Telefunken ECC83/12AX7 tubes in the moving coil phono stage. My tube tester for small tubes is the Maxi-Preamp 2 from Maxi-Test. After 15 months daily use of the C2300, both pairs of 12AX7's still tested strong and closely matched. No reason to install new tubes at this time. That's good news. I reinstalled the tubes in the preamp, and reinstalled the preamp in the rack. I love my C2300 preamplifier. It's feature rich, quiet as a mouse, sounds remarkable, built like a tank, and is all analog.


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Marmarosa 09-10-2019 01:14 PM

Dan,

Could you please tell me who is the stock tubes´s manufacturer in this preamp?

Big differences in terms of sound quality between the stock tubes and the Gold Lyon´s ?

Thank you.

Chema.

stereo_5 09-10-2019 01:29 PM

I believe the stock tubes are JJ.

jdandy 09-10-2019 06:42 PM

Quote:

Originally Posted by Marmarosa (Post 979198)
Dan,

Could you please tell me who is the stock tubes´s manufacturer in this preamp?

Big differences in terms of sound quality between the stock tubes and the Gold Lyon´s ?

Thank you.

Chema.

Chema.......When the McIntosh C2300 was in production the factory was using tubes made in China. I think they were made by Shuguang. I don't know exactly when McIntosh made the decision to begin using JJ Tubes as their branded tubes, but as I have been told, JJ Tubes are what McIntosh presently uses. I pulled the Made In China tubes out of my C2300 years ago and now use Gold Lion 12AX7 and Telefunken ECC83/12AX7 tubes exclusively. Yes, there is a considerable improvement using Gold Lion tubes. I have no problem recommending them.

Marmarosa 09-11-2019 03:06 AM

Quote:

Originally Posted by jdandy (Post 979233)
Chema.......When the McIntosh C2300 was in production the factory was using tubes made in China. I think they were made by Shuguang. I don't know exactly when McIntosh made the decision to begin using JJ Tubes as their branded tubes, but as I have been told, JJ Tubes are what McIntosh presently uses. I pulled the Made In China tubes out of my C2300 years ago and now use Gold Lion 12AX7 and Telefunken ECC83/12AX7 tubes exclusively. Yes, there is a considerable improvement using Gold Lion tubes. I have no problem recommending them.

Thank you very much, Dan,

Why don´t you use the Gold Lion in the phono section?

Chema.

jdandy 09-11-2019 08:11 AM

Quote:

Originally Posted by Marmarosa (Post 979282)
Thank you very much, Dan,

Why don´t you use the Gold Lion in the phono section?

Chema.

Chema.......The Telefunken tubes measure about 3dB quieter than the Gold Lion tubes. Both manufacturer's tubes are quiet, but the Teles are the best. I use an Ortofon Cadenza Blue moving coil cartridge in the living room system. It is a low output moving coil. The extra 3dB lower noise floor is an advantage to how quiet the background remains.

miner 09-11-2019 02:07 PM

Very nice Dan. Thanks for sharing.

Marmarosa 09-11-2019 02:29 PM

Quote:

Originally Posted by jdandy (Post 979285)
Chema.......The Telefunken tubes measure about 3dB quieter than the Gold Lion tubes. Both manufacturer's tubes are quiet, but the Teles are the best. I use an Ortofon Cadenza Blue moving coil cartridge in the living room system. It is a low output moving coil. The extra 3dB lower noise floor is an advantage to how quiet the background remains.

Thank´s again Dan,

Using a MM cartridge, the benefits of Tekefunken tubes should be equivalent, isn´t it?

Chema.

jdandy 09-11-2019 05:50 PM

Quote:

Originally Posted by Marmarosa (Post 979332)
Thank´s again Dan,

Using a MM cartridge, the benefits of Tekefunken tubes should be equivalent, isn´t it?

Chema.

Chema.......The higher output voltage of moving magnet phono cartridges negates some of the necessity for ultra quiet tubes in a phono stage. The higher signal levels produce from moving magnet designs deliver a louder signal that requires less amplification from the phono stage circuitry, so the noise floor is essentially masked to a certain degree by the stronger signal. That said, it is never a bad thing to have the quietest tubes in a phono stage, be they moving coil or moving magnet.

miner 09-12-2019 06:54 PM

Dan,
Was this tube testing in preparation for your new amps?


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