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In both cases, the bass shift and pull deep knobs connect a capacitor into the circuit. So, with the knob pushed in, the capacitors are not in the circuit (ie, they have no effect) and with the knob pulled out, the capacitors in are in the circuit (ie, they do have an effect). In both cases...

I think that nearly any cheap ceramic through-hole cap will be extremely similar to the ones originally used. Yes, you'll need at least a 500-600V rating, but I think that nearly any through-hole ceramic will do that. I think that 1 kV ratings are common for through-hole ceramics. You could...

Oh, there's also the issue of the power supply. How much decoupling is present between the various pre-amp stages and how much de-coupling is present between the pre-amp and power-amp can affect the sound and feel of a tube amp. Some say that you want lots of decoupling so that each stage is...

Just looking at the schematic of the pre-amp, the two do look mighty similar. The biggest differences center on what has been added, not necessarily what has been changed. If you've ever done any amp building or amp modification, you'll know that hanging more components off a...

The Mark series amps (like most tube amps that are more than 10W) use a "Long-Tail Pair" phase inverter to take the single-ended signal running through the pre-amp and to generate the separate positive-going and negative-going signals required by the class AB power amplifier. A long-tail pair...

The thread where I discuss the development of the schematic for my IIC is at: http://forum.grailtone.com/viewtopic.php?f=27&t=37463&hilit=schematic Towards the end, we get to the best schematic that I was able to do before sending it off to Mesa for the IIC+ upgrade. The last schematic that I...

Have you played a IIB or a IIC for any length of time? What style of music do you play? I'm curious to know what experience is informing your thoughts on the IIC... Also, as someone with experience with circuits, amp building, and amp modification, I will also offer my opinion that the IIC...

The IIC+ is actually very different from a IIC. I had a IIC. After much playing and after tracing out the schematic, I knew that amp pretty well. I then sent it to Mike B for him to mod it to turn it into a IIC+. The amount of work that is necessary to do the upgrade is pretty...

The "Pull Deep" and "Gain Boost" on the Mark II's are all the same function...they merely changed the name written on the face plate. IMO, "Pull Deep" is definitely a better name for it. In the circuit, what it's doing is attaching a bigger capacitor to the cathode of the gain stage...

...but I'm not dead yet! Seriously, while this is a beaten horse, I still have not seen a schematic showing what was done to make the IIC++ mod (or Hetfield mod or Petrucci mod, or whatever). Until I see a schematic, I'm still curious about what people have to say about it...thinking that...

Also, on the Fender side, be aware that the Twin (assuming you mean blackface Twin) and the Bassman (assuming you mean tweed bassman) are quite different beasts from each other. They really should not be thought of as having the same "Fender sound". They're really two different sounds. The...

In my opinion, how picky are you with regards to getting the Fender clean? Have you owned a good Fender tube amp before...do you know and love that tone from first-hand experience? If so, you're going to end up disappointed. I own a Mark IIC upgraded to a IIC+ *and* I own a Fender Deluxe...

Pretty good! My main comment: you've got too much bass guitar. Listen again for the bass guitar in AJFA...where is it? To my ear, there is practically none. It's like they were saying..."we're not too sure of that Jason Newstead (sp?) guy, so we're going to keep him real low in the mix so...

Listening through my Sennheiser HD280 headphones, it's amazing how closely you were able to tune the Mark III and the Mark V. The biggest difference was when you were running detuned, but even that was subtle. Then, with the Recto, I was really really surprised at how closely you got those two...

I modified my RI Fender Deluxe Reverb to put in the IIc+ lead circuit. I based my mods on the IIc+ schematic. Translating that into actual circuitry in my amp was challenging due to the constraints of the existing Fender circuitry. Predictably, when I was done, it didn't sound anything like...

I'm confused...my amp has reverb and, if you're asking about RP-10A, doesn't yours have reverb, too? I thought that's what the "R" in "RP" was for..."reverb"...but I'm not an expert on the various PCB revs, so I could totally be confused. Either way, I've got the RP-10 and you need the RP-10A...

Hi Ed, My IIC -> IIC+ has the RP-10 pre-amp board... Is it really the -10A that you want? If so, I can't help. Sorry. Chip Full Mark IIC Gut Shots: https://picasaweb.google.com/109244885492088240430/20090628MarkIICGuts?authuser=0&feat=directlink

Hi there, I'm the "chipaudette" that GTS was talking about. To reinforce what George was saying, it's not tone-snobbery that is causing us to tell you that a IIC is not a IIC+, it's that the circuits are really very different. And I'm not talking simply about changes in resistor or capacitor...

Not that I disagree with your overall assessment, but the patent argument isn't true anymore. Yes, simul-class is patented, but its filing date was 1985 and its issue date was 1986. If you believe Wikipedia, the term of US patents is about 20 years, so this technology is now off patent...

I always liked the history of the 2-Chan Rectos presented on the theboogiearchives. I like it much the same way as I like the discussion of the Mark III stripes that was on Ian's site. It's a pity that both sites (with their pics) can't stay up forever with no costs or labor by their owners...