mark IIc+ preamp schematic
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Boogiebabies
Well-known member
Did the same thing with a program called Design Works 4.0.
Whether it will work and sound correct in a PTP design is what remains to be seen. I also did the EQ.
I bet John K. from England did this. He's awesome.
Whether it will work and sound correct in a PTP design is what remains to be seen. I also did the EQ.
I bet John K. from England did this. He's awesome.
Elpelotero
Well-known member
so is it accurate?
Boogiebabies
Well-known member
Miguel,
Go ahead and build it and let us know.
The ceramic disc off the V3B coupling cap should be 250pf.
Is the phase still correct ?
Where's the reverb !!!! ( just kidding)
Go ahead and build it and let us know.
The ceramic disc off the V3B coupling cap should be 250pf.
Is the phase still correct ?
Where's the reverb !!!! ( just kidding)
Elpelotero
Well-known member
i think i'll pass on that one.....
i just wanted to know so i can compare it to my board.
i just wanted to know so i can compare it to my board.
4nkam
Well-known member
There were a few layouts on the sloclone board too.
Reeko81
Well-known member
This is a present from me for all boogie boarder....
As i wrote in a different topic i've modded my mark III blue stripes preamp to be a kind of IIC+...
And this is the real IIC+ schematic..readable and with right values....given me from MESA FACTORY.
Have a nice time working on it...
I did it modding my mark III and i'm really happy!
As i wrote in a different topic i've modded my mark III blue stripes preamp to be a kind of IIC+...
And this is the real IIC+ schematic..readable and with right values....given me from MESA FACTORY.
Have a nice time working on it...
I did it modding my mark III and i'm really happy!
Boogiebabies
Well-known member
Man, that is the cleanest I have ever seen.
Thanks.
Thanks.
Reeko81
Well-known member
Now that you can also read a good schematic i can ask you more:
what is the right value second you of that resistor that from V1B in series with a 0.47 cap goes to the ground?
It seems to be a 180k, but in a lot of schematic is a 100k...
I've found also in my Mark III preamp to be a 100k, but i'm not sure...
maybe is the right trick to obtain a more sparkly clean in my mark III blue stripes.
Anyone who is interested about the mod i did on my mark III can ask me, we could have a nice talk about these sweet amplifier schematics...i've learned comparing mark IIc+, mark III and mark IV schematic (and also working directly on my mark III) more than you can imagine, so we could have a nice time comparing and checking the real differences between a modded mark IIIc+ and a original mark III.
Structure and architecture of these preamps are probably identical, both (mark III and mark IV) are the natural evolution of the real AMP, the king of amps, the real IIC+. They tried at mesa to mimick as possible, or better to follow the good path modifying and tweaking over a good amp construction such as IIC+ obtaining new sound, that someone could or couldn't love. Mark III is a natural evolution with a 3rd channel add , mark IV added a real 3rd channel with its own tone and gain..and so on...can't say much about those power amp, but mark IIC+ has been for mesa engineering the right path to run to develop new amp...
what is the right value second you of that resistor that from V1B in series with a 0.47 cap goes to the ground?
It seems to be a 180k, but in a lot of schematic is a 100k...
I've found also in my Mark III preamp to be a 100k, but i'm not sure...
maybe is the right trick to obtain a more sparkly clean in my mark III blue stripes.
Anyone who is interested about the mod i did on my mark III can ask me, we could have a nice talk about these sweet amplifier schematics...i've learned comparing mark IIc+, mark III and mark IV schematic (and also working directly on my mark III) more than you can imagine, so we could have a nice time comparing and checking the real differences between a modded mark IIIc+ and a original mark III.
Structure and architecture of these preamps are probably identical, both (mark III and mark IV) are the natural evolution of the real AMP, the king of amps, the real IIC+. They tried at mesa to mimick as possible, or better to follow the good path modifying and tweaking over a good amp construction such as IIC+ obtaining new sound, that someone could or couldn't love. Mark III is a natural evolution with a 3rd channel add , mark IV added a real 3rd channel with its own tone and gain..and so on...can't say much about those power amp, but mark IIC+ has been for mesa engineering the right path to run to develop new amp...
Reeko81
Well-known member
EHEHEHEHEH..anzi LOL...scrivendo velocemente e tanto in inglese ogni tanto ti scappa l'italiano..ehhehe
cmq l'ampli è già modificato...sto continuando a fare dei ritocchini e sfortunatamente aspetto delle 6L6 perchè una mi si è rotta spostando l'ampli...che sfiga...50 euro di 6L6 buttate...Ma il suono con le sole EL34 nel lead è bestiale...
Mi piacerebbe coinvolgere un po' tutti su sta storia della Mark IIIC+ ma a quanto pare qui in america tutti vanno direttamente da Mr Bendinelli alla mesa...a noi viene un tantino distante e un tantino esoso spedirgli l'ampli...
cmq l'ampli è già modificato...sto continuando a fare dei ritocchini e sfortunatamente aspetto delle 6L6 perchè una mi si è rotta spostando l'ampli...che sfiga...50 euro di 6L6 buttate...Ma il suono con le sole EL34 nel lead è bestiale...
Mi piacerebbe coinvolgere un po' tutti su sta storia della Mark IIIC+ ma a quanto pare qui in america tutti vanno direttamente da Mr Bendinelli alla mesa...a noi viene un tantino distante e un tantino esoso spedirgli l'ampli...
Boogiebabies
Well-known member
what is the right value second you of that resistor that from V1B in series with a 0.47 cap goes to the ground?
100K.
Che cosa è con tutto l'italiano?
100K.
Che cosa è con tutto l'italiano?
Reeko81
Well-known member
So you believe it's a 100k? But it's a little strange...i'll try in that position a 180k 1w ( the original in my mkIII is 100k 1 w). If you notice better it is a little strange zero ( it may seem a deleted 8 ).
It seems a little strange to be a 100k.
That would be interesting to find a kind person who owns a IIC+ and can watch inside his amp and confirm us!
Are you curious about our conversation in Italian? EHHEHEHEH
Dont' worry...he was talking about my poor english!!!
It seems a little strange to be a 100k.
That would be interesting to find a kind person who owns a IIC+ and can watch inside his amp and confirm us!
Are you curious about our conversation in Italian? EHHEHEHEH
Dont' worry...he was talking about my poor english!!!
Reeko81
Well-known member
So Boogiebabies... do you undestrand a bit of Italian???
Boogiebabies
Well-known member
No, it's a translator. I only know how to curse in Italian.
I think your English is better than most Americans.
I'll double check the IIC+ circuit board. I have one open right now.
I personally have three Simul-EQ-Reverbs as well.
I think your English is better than most Americans.
I'll double check the IIC+ circuit board. I have one open right now.
I personally have three Simul-EQ-Reverbs as well.
Boogiebabies
Well-known member
It's 100K.
Reeko81
Well-known member
Thanks so much!!!
But if i'm not wrong you've just told you've a mark IIC+ opened right now!!!!!
WOW!
I can't know now which is the first question i want to ask you!!!
Well....could you tell me too if that 100k resistor in V1A that goes to those sprague capacitors ( one .1 the other .047) precedes the .1 cap or the .047 cap?
In my mark III this resistor goes first .047 but i will remember to anyone that there are always slight differences between mark III schematic (which is a dot black stripes) and mine that is a blue stripes.
I've done this last mod now, i haven't noticed before!
Boogiebabies since you have 3 Mk IIc+, could you tell me how mark IIc+ clean is clean with an humbucking guitar in class A mode?
In these sweet amps, pull deep pot is like a gain boost that add a lot of body??
But if i'm not wrong you've just told you've a mark IIC+ opened right now!!!!!
WOW!
I can't know now which is the first question i want to ask you!!!
Well....could you tell me too if that 100k resistor in V1A that goes to those sprague capacitors ( one .1 the other .047) precedes the .1 cap or the .047 cap?
In my mark III this resistor goes first .047 but i will remember to anyone that there are always slight differences between mark III schematic (which is a dot black stripes) and mine that is a blue stripes.
I've done this last mod now, i haven't noticed before!
Boogiebabies since you have 3 Mk IIc+, could you tell me how mark IIc+ clean is clean with an humbucking guitar in class A mode?
In these sweet amps, pull deep pot is like a gain boost that add a lot of body??
Reeko81
Well-known member
I've noticed now after the mods that pull deep pot react better on lead channel, but on the clean one is difficult to obtain clean sound expecially with a Les Paul (at higher Volume 1 settings).
Maybe i've got to change the right position of that resistor (the 100k i talked about before)
Maybe i've got to change the right position of that resistor (the 100k i talked about before)
Reeko81
Well-known member
I cannot stop asking now that i've discovered you got three mark IIC+!!!
On the lead stage exactly on V4A if you catch the schematic there is an advise: DELETE ON SIMULCLASS...now i'm wondering...he is talking about that 0,001 uF ceramic cap? I've just noticed that my mark III lacks this cap and obviously my MK III is simulclass...
Yours IIC+ lack too???
THANKS SO MUCH!!
On the lead stage exactly on V4A if you catch the schematic there is an advise: DELETE ON SIMULCLASS...now i'm wondering...he is talking about that 0,001 uF ceramic cap? I've just noticed that my mark III lacks this cap and obviously my MK III is simulclass...
Yours IIC+ lack too???
THANKS SO MUCH!!
