Artisan 15 Tube Position and Function

HAND-CRAFTED TONE. Artisan Series Amplifiers.
spike01970
Posts: 4
Joined: Fri Aug 30, 2013 8:10 am

Mon Sep 02, 2013 9:28 pm

Hi, Just want to know if mine is correct as i got it second hand, as follows -
TAD 7025 - EF86 - ECC83-EL84 - EL84 - EZ81 - That is the order of them, is this correct. and what is there function and relevant no V1 V2 V3 etc
I understand that the EL84 are the power tubes and the EZ81 is the rectifier but are the three i have underlined in the correct position ?
Thanks

spike01970
Posts: 4
Joined: Fri Aug 30, 2013 8:10 am

Tue Sep 03, 2013 8:52 pm

This is what i found out so i will share with you, may help someone =

V1 = ECC83 Ch 1
V2 = EF 86 Ch 2
V3 = ECC83 P Inverter
V4 = EL 84 Power amp
V5 = EL 84 Power amp
V6 = EZ 81 Rectifier

Changing power amp valves for other make EL 84 is fine and no bias required.

The above is a basic explanation of tube function but will help anyone like me who likes to tube roll

Mr Co
Posts: 10
Joined: Wed Oct 10, 2018 6:02 pm

Thu Oct 11, 2018 8:11 pm

Can some one confirm is this picture correct regarding tube positions?
Attachments
tubes.jpg
tubes.jpg (124.65 KiB) Viewed 15906 times

thebigiam
Posts: 3
Joined: Mon Feb 16, 2015 1:18 pm

Fri Oct 12, 2018 12:03 pm

Yes you are correct !!

thebigiam
Posts: 3
Joined: Mon Feb 16, 2015 1:18 pm

Fri Oct 12, 2018 12:04 pm

tell me do you notice any difference in volume between ch1 and ch2 on same levels?

Mr Co
Posts: 10
Joined: Wed Oct 10, 2018 6:02 pm

Sat Oct 13, 2018 10:58 am

Yes! :shock:
How do you know and why did you ask?

Mr Co
Posts: 10
Joined: Wed Oct 10, 2018 6:02 pm

Tue Oct 16, 2018 10:51 am

I hear some strange crackling whan I trun the CH2 to max....

You can hear it here....


https://files.fm/u/8x46tvk6

Mr Co
Posts: 10
Joined: Wed Oct 10, 2018 6:02 pm

Tue Oct 16, 2018 3:53 pm

This is strange.

There is a clear sound from the speaker when I tap on the two preamp tubes while the amp is on (two tubes on the far right - 12AX7 and EF86)
What is strange that this only happens when I turn on chanel 2.
Its not audiable on chanel 1.
These are bad tubes that need t be replaced, right?
But why I dont here this on chanel 1

Mr Co
Posts: 10
Joined: Wed Oct 10, 2018 6:02 pm

Fri Oct 19, 2018 3:31 pm

New preamp tubes arrived today and in the went.
No more problems :-)

One question, can I put in V1 slot an 12AY7 tube without any amp moding?

User avatar
Sonofarich
Posts: 606
Joined: Thu Feb 24, 2011 1:00 am

Fri Oct 19, 2018 8:24 pm

Yep...no problem, although wouldn't you want the gain reduction (or rather taper) to be in V2?

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