Tube Rolling | Luxman CL-38uc

Hi @jfandr147 and all - I have the CL-38u and CL-38u-SE models, the tubes of which are laid out the same as in the 38uc. 

I don't know how to post an image, but I've spent some time under the hood of the 38u, traced out tube signal flows, and can describe for you the location of the tubes in question.

With the faceplate facing you, there are two rows of four tubes; a front row and a back row. For purposes of this description we'll call the back row tubes 1 through 4, from left to right. The front row holds tubes 5 through 8, from left to right. For reference, the phono tubes (with cages) are positions 3, 4, and 8. Tube positions 1 and 5 are for the EQ section. The tubes not involved in phono or EQ sections are in positions 2, 6, and 7.

I haven't done much in the way of tube rolling but can assure you with confidence the above is accurate.

I hope this helps - I'd love to hear back on any experiences with the tube rolling.

well done @acefactory -- here is a pic to accompany your excellent description

so the tubes op wants to roll are three of the four middle ones (leaving aside the one single middle one with the white spring loaded tube damper/cage)

Thank you so much @acefactory ! you just saved me ton of time trying to figure that out! :) ... I'll report back on how the tube rolling goes, will try a set of Telefunken and Mazda tubes.

@jjss49 thanks for the picture, comments and your initial remarks regarding tube differences. You are absolutely right, better to stick with 12AU tubes in this case as intended (that's what I ended up doing).

Wonderful!! This is really helpful. Looking forward to hearing back on some rolling results. 

wow this is a lot of help.   I wasn't sure about tube position either.

If anyone has done some rolling please post it up