2. amps-preamps
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Tube Rolling | Luxman CL-38uc

Hey guys!

Was wondering if I could get your advise about tube rolling on a Luxman CL-38uc.
http://www.luxman.com/product/detail.php?id=27

I’m trying to avoid having to change all Tubes (I want to change them for NOS Tubes).

Since I won’t be using Phono or Tone Controls.
I will just be using the Balance Line In and Line 1/2 Out.

From what I can tell from the schematic (see below) I only would need to change the ones enclosed in green.

Here are the schematics for the CL-38uc Pre-Amp per Luxman: https://drive.google.com/file/d/1pzkwm9U4JIDqbYN-KUmwtvVAFiipUlOG/view?usp=share_link

 

 

My questions

- Is my assumption accurate? Or do I need to change other ones?

- Can I use other type of tubes in place of the 12AU/ECC82?
For example I have plenty of ECC83s/12AX7 If so, is there any precautions I need to be aware of?

Any help is appreciated,

Thanks!

jfandr147
jperry
2,432 posts
 

I got good sound with RCA cleartops, and better sound, for a higher price with NOS Telefunken tubes in mt CL-38uC

jfandr147 OP
7 posts
 

Thanks for the quick reply @jperry :)

Was wondering, did you change all tubes?

What do you think about just changing the 3x 12AU/ECC82 on the center section? (see my initial post)

Let me know,

Thanks!

jperry
2,432 posts
 

I changed all of the tubes.

If you are only using certain tubes and they are the only ones you hear, then it should work.

I don't know enough technical stuff to comment on your diagram, etc.

knotscott
820 posts
 

You can change out the 12AU7s with another brand, and you might even be able to substitute a 12BH7a, but the 12AX7 has a lot more gain than a 12AU7 so I don't think those are interchangeable in that application. 

 

 

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