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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
oddiofyl's avatar
oddiofyl
3,887 posts
 

I would stick with 12AU7.   It was voiced with those and they are easier to find  NOS .  And usually cheaper than same vintage nos 12ax7....

RCA 12au7 from the late 50's / early 60's is what I used in my last preamp and they sounded great and measured super strong .   

oimuller
6 posts
 

I'm going to bump this thread up as I'm looking for some new tubes.  

I actually want easy on the ear & forgiving of bad recordings types 

I see a few responses here and it seems to be the biggest thread I can find on this model pre

audiojan's avatar
audiojan
404 posts
 

I ended up with Genalex Gold Lion 12AU7 for all the input tubes. Sounded the absolute best of all the ones I tried. Smooth yet detailed, superb depth and width.

milpai's avatar
milpai
2,402 posts
 

@oimuller , try the Psvane Horizon 12AU7. They are not warm though.

oimuller
6 posts
 

Update :
to start. I am using Legacy audio Studio HD monitors in near/midfield in a small 10’x12’ room.    
I just purchased a vintage but restored v-fet Yamaha B-2 amplifier. 
The amp is smooth yet unforgiving. But the soundstage is huge

jvc/victor QLY-77f turntable    Hana SL cartridge 

for digital just a Wiim pro and Spotify 

3 x RCA clear top 12au7 in the linestage made a big difference. 
The 1950’s RCA’s smoothed out the sound a lot.    Listening fatigue is gone  without blurring the details    I spent an evening pulling out sibilant 80’s punk records and cranked it like I was 20yrs old 

I also tried a few 12ax7 in the phono stage 

new gold lions and a pair of vintage mullard

the Mullards won out but the phono stage tubes did not make near as big of a difference to my ears.  I honestly have never been in love with this Hana cart ( I have a few others but haven’t set them up in the spare arm)

comparing the same tracks on vinyl and Spotify  

new Gold Lions were still better than digital or stock JJ 

a vintage pair of Mullard with 1 gold lion in the 3rd spot was better than all

but not a big subjective leap like the linestage tubes 

 

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