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I have been very happy with the Celestion G12T-75 in my Silver Jubilee cab. The 75s really fatten up the tone of any amp. They work especially well with the older Marks. The V30s in the recto cab just don’t cut it after hearing the two back to back.

Hi everyone, I decided to pull out the Mark IV today. It has been a few years since I last played it. It is an early Mark IV a. I found that the footswitch will not change channels. The amp starts out on the lead channel. All the lights on the switch will change when selecting a different...

Sold.

I will have to give this a try, on a side note this is also how you get closer to the JMC 800 bark with a JVM 410, I have also been thinking about selling the JP. I don't get to play as much as I use to and I prefer to play through the ++ or the III.

James had the same style amp head in a different color at a Sharks game also.

After a few months I went back to mostly just playing the C++. The JP2C still has too much of that modern compressed tone, for my liking, and not near the edge and aggression of the C++.

This weekend I was playing around with the presence knob and the 6600 slider on the JP-2C to see it worked similarly to the Mark III. It is very close not quite the saturation like the III, but tone works the same with knocking down the harshness. Dropping down from 100 watt to 60 watt helped...

My chassis actually has 12ax7 written by all the sockets, but I wouldn't think that putting an 12at7 in would hurt the amp. It just won't have the same output as an 12ax7.

The C+ is the Holy Grail.

After I find the tubes that work best in the amp, there is no need to change them until they die.

Just a Decimator Noise Reduction unit for me.

I usually run my presence around 4-5ish so the middle test sounded best to me it is saturated but still has definition in the notes. The one with presence at 9 was border line mushy, it was fatter sounding but it lost some of the clarity in the notes, and then again that might be solved by...

Just to give you another opinion. I rarely play my Mark IV. It has a tone all its own, not a bad tone just different than the other amps(said as more modern). I know I will be in the minority on this, but I prefer the blue stripe over the other amps, it is just metal goodness.

****! Sounding good! I would also like to see those settings. I am still trying to dial in a smoother tone.

I keep the base knob at 1 or less, and add it back in with the 80hz slider.

I didn't like the RCA 12ax7 in the Mark III. It had good tone but it lost a lot of the aggression. If you don't play metal it would be fine. I prefer Jan/Phillips or GE in v1 and v3. Then a old Mullard 12at7 in the PI.

I agree Markedman, the JP is really close in tone and attack to the C++. After playing around with the JP I can get an awesome "Justice" tone.

In the new videos James was also using the (Metallica) C+ and a three channel Duel recto.

I got it off of here a a few years ago,in one of the Mark III threads. Here is the link http://www.chain-metal.nl/mark3/ Also, I use a foot switch when I play the Mark and just didn't list the lead channel knob as pulled.

Well I put the =C= winged C 6L6 in the JP today. WOW, what a difference! It made is even closer to the classic boogie tone. The winged C tubes really filled out the mids on the amp. I enjoy playing the JP so much, I kind of feel like I am cheating on the C++.