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I feel it would not be giving anything away to say, what you propose cannot be done the to A15 or A30. You could do it to the A100!
Dave.
Thanks for the replies.
Why is it not possible with the 15 or 30?
Take them with a huge pinch of salt...
(posted on MEF - Note obvious error on EL84 cathodes).
http://img573.imageshack.us/img573/9825/artisan15part1.gif
http://img577.imageshack.us/img577/5968/artisan15part2.gif
(Posted on EL34world - drawn in a confusing manner!)
http://i255.photobucket.com/albums/hh143/werdnayarg/webstuf/Blackstar-Artisan-15H_zps115986b9.gif
I believe that Dave (ECC83) worked (works?) for Blackstar...
I did indeed. Twice! I had to jack in Sept 13 due to a serious family health issue.
I do not think the Artisan 15 and 30s are a deliberate attempt to "clone" a Vox? They just use a similar valve lineup (tho' I think the EF86 stage is quite unique?) .
We have a Mersey Super 15 which is itself a Dominator clone but Son says it does not "do" AC15 and it CERTAINLY does not sound like an Artisan 15! He loved the EF86 stage in the Blackstar amp.
The Artisan 100 is different again and is really only a very well build "classic" EL34 amplifier. They seem to me to have been rather ignored and therefore might be good value on the Bay? Certainly if you can find a good set of valves for one you will never have any other trouble!
Dave.
Thanks for the reply.
Can you explain your original comment about removing the NFB loop please?
Thanks
Ben
Those schematics are generally considered to be wrong.
I'll get a tech/expert to have a look and come back with my findings.
Ben
You can't disable it by removing components ('lifting' them or cutting their leads) - you would need to find and break the connection marked 'X' below:
http://i255.photobucket.com/albums/hh143/werdnayarg/webstuf/artisan15part1x_zpsb2a3fa89.jpg
What are you hoping to gain by this?
Looking forward to your expert's input.
Coy? Maybe, I call it old fashioned loyalty. When/if Blackstar decide to publish their schematics I shall be happy to discuss them. I am happy to give certain information, bias values for instance. I consider the OP's idea "pointless" and I know Blackstar are not keen on people modding their designs.
My own PERSONAL view is that manufacturers of all persuasions should make service information readily available (Quad always included a schematic in the user handbook. Din't do them any harm!) but I respect Blackstar's position.
Dave.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
My tech has the schematic now; he's just trying to find time to look at it.
I'll keep you posted!
Ben
Although the local NFB loop shown around the EF86 is indeed an 'NFB loop', it's not the Global NFB loop that most people would be referring to in the context of making NFB switchable.
Local NFB like this is not uncommon, but as has been mentioned, the idea of simply switching it off doesn't stack up, as the effects are likely to be undesirable.
Unlike a global NFB, where making it defeatable or variable can be an interesting way to add tonal flavours to an amp.