*** Orange AD200B Unofficial Manual ***

[boroman]

OK. I sat today and finished it Excuse my bad English. Please read and comment here... maybe there's sometinhg I forgot? Maybe there are mistakes as I am not English-speaking guy.

I wrote it because we all had here a lot of questions about this head and Orange to this day don't have a manual to this amplifier.

There's also info about biasing this head. Please read it carefuly. I'm going to sleep, wake up tommorow, read it again and probably have more to say aobut it

When it'll be done, I will post also a downloadable PDF.

The manual can be found here: www.dustblow.com/ad200b

/boro

[garcimore]

nice and useful work, thank you

can you explain why, when connecting two 8 ohms cabinets, one as to be connected to the 4ohms output.
always used the two 8 ohms output and never had any problem.

[markjazzbassist]

awesome

thanks so much!!

i didn't know the circuit was passive. so all up is flat eh? interesting....

[boroman]

garcimore: you don't have two 8 ohm outputs in Ad200b ???
markjazz: old fender amps also had passive EQ and this one works like them

If you guys found any mistakes, please correct me. Thank you!

[garcimore]

oups, sorry, i meant two 4 ohms output, bit early in the morning for me i guess

[bclaire]

If I were you, I'd take out all of the bias information. Orange wouldn't put that in a manual and it would fool people into thinking that they could do this themselves, when they could kill themselves or get hurt- plus void the warranty.

I'll take a look at it and fix some stuff for you when I get a chance.

I would also take out speaker cabinet information for anything other than 8 or 4 ohm cabs.

[boroman]

Hello again,

Billy - thanks. The speaker connections and biasing was probably the only points that decided me to write it. Do you know that in my country NOBODY can bias this amp good? All tech's I've asked to do it (telling them all parameters like plate voltage, tubes etc.) told me very different voltage to set (mA) and no-one told me even near that I have learned from orange tech in UK. (so that people would hurt people's amps).

ALSO - e.g. polish Orange dealer don't know how to do it.
I think many people worldwide have the same problem (I read it again and again on other communities). Mesa/Boogie and other manufactures encloses bias proceudre to their amps (or videos on websites / or internet help)...

The same is for speaker connections - the same questions here week by week. The same answers. So i dit it...

Billy I know that You are moderator here, if you feel that I've wrote something wrong, just delete this thread, I will just promote it on Google.

thanks
/boro

[Sooner]

WHEN YOU HAVE: TWO 4ohm CABINETS:
This can be done only the way when your cabinets support serial chaining
(linking one 4ohm cab to another 4ohm cab and then do 8ohm output)

True. But aren’t most cabinets set up for parallel chaining?

WHEN YOU HAVE: TWO 8ohm CABINETS:
Connect 1st cabinet to 4ohm output,
connect 2nd cabinet to the second 4ohm output

Or when your cabinets support parallel chaining:
Connect 1st cabinet to 4ohm output,
connect 2nd cabinet to 1st cabinet.

WHEN YOU HAVE: TWO 16ohm CABINETS:
This can be done only by pulling out a pair power tubes (1 and 3 or 2 and 4), so the output transformer will send 2x higher impedance to the speaker jacks. Of course, if you pull out these tubes, you’ll loose some power (headroom), but you will not damage your speaker cabinet.
So if you do this – connect 1st cabinet to 4ohm output, connect 2nd cabinet to the second 4ohm output

Or when your cabinets support parallel chaining:
Connect 1st cabinet to 8ohm output,
connect 2nd cabinet to 1st cabinet.


And I'd leave the biasing info in there too. It's an unofficial manual so it doesn't matter what Orange would do.

[boroman]

Thanks Sooner for adds - one thind, did I mistaken "serial" for "paralell". I always thought that serial-linking is like "amp->1st cab>2nd cab>3rd cab".

So this is serial or pararell?

[Sooner]

Thanks Sooner for adds - one thind, did I mistaken "serial" for "paralell". I always thought that serial-linking is like "amp->1st cab>2nd cab>3rd cab".

So this is serial or pararell?

In most cases cabinets connected in a "daisy chain" as your diagram depicts , will be connected in parallel. I suppose you could design cabinets to be "daisy chained" in series but I've never heard of that.

[boroman]

OK. Maybe they are wired in pararell, but.. I mean:

one thing -> to another thing -> to another thing -> etc.

is placing these things in series, right?

[markjazzbassist]

do you usually run your EQ all full on? or do you have them at noon?

i'm just wondering if running it all at full tilt would cause the speakers any damage? that's a lot of bass.

[Sooner]

OK. Maybe they are wired in pararell, but.. I mean:

one thing -> to another thing -> to another thing -> etc.

is placing these things in series, right?

What looks like "one thing -> to another thing -> to another thing -> etc." can be either a parallel or series connection, depending on how they are internally wired:



Orange cabs, and all others that I'm aware of are set up for parallel connections when one is connected to another etc. (daisy chained).

[boroman]

So... we meant other things:

I meant like that --[]--[]--[]--[]-- - no matter what is it (could be lego blocks;) - this is a serial chain.

So going like this --[amp]--[cab1]--[cab2] this is also a serial chain.

So, [amp-8ohm-output]---[4ohm-cab]---[4ohm-cab] is also a serial chain no matter what is the wiring inside.

I think most cabs have wiring inside like you told, but I don't think is a important info. Could do a little mess in the head. Most important thing is that you daisy chain two 4-ohm cabs, you'll have a total of 8ohm.

[boroman]

do you usually run your EQ all full on? or do you have them at noon?

i'm just wondering if running it all at full tilt would cause the speakers any damage? that's a lot of bass.

Haha! Mark! I always thought that tons of bass are a "factory mistake"

I run my AD200 through Ampeg 8x10 and mostly Precision Basses and my settings are bass:1, mid:9, treble:3. This is the most "bassy" head I've played in my life.