Search results

On my fender deluxe reverb reissue (all tube, with a reverb circuit similar to the boogies), I've run it without a reverb tank plugged in and actually had some arc'ing within the amp chassis. Like the previous posts said, don't run it without some sort of connection. You're just asking for...

Cool info. I'm always down with some good circuit talk. Chip

It's a tough lesson for me to follow myself: every amp has its own inherent sound, go with the amp that best fits the sound in your head. Don't force another amp to fit into the sound that another amp does naturally. In this case, ff it's the Fender that makes the sound and the Boogie doesn't...

What speaker do you have? Is it open-backed or closed-backed? Also, what kind of Twin / Deluxe tones do you like? Is the the spanky clean funk sound, the drenched in reverb surf sound, the edge of breakup blues sound, jam band push, rolling stones grit, turn to 11 roar? So many choices...

Hey George, Thanks for digging up that quote of mine. I'd forgotten that I'd written that... It's now been a couple of years and its still true. In my living room, I've still got my IIC(+) and my Fender Deluxe Reverb reissue. Despite the Fender heritage in the Boogie, when I need *that*...

There are all sorts of switching systems out there...if you didn't feel like building your own... Voodoo Labs Pedal Switcher: http://www.sweetwater.com/store/detail/PedalSwitcher/ Morley A/B/Y/Mix: http://www.sweetwater.com/store/detail/ABYMix/ RJM Mini Effect Gizmo...

LDRs are one of the more common items to fail. My questions to the OP were aimed at determined which LDRs might have failed. It's also possible that the circuit elements that create the LDR voltage rail might have failed, which means that none of the LDRs are working properly. Fixing that...

Do the tone controls for the other channel have any effect? Like, if you're in the clean channel, do the tone controls for the lead channel have any effect at all? They should have none. If they have *any* effect, it sounds like you've got some weird channel switching going on. LDRs or...

Also, please don't view my post as getting up on a high horse about the supposed awesomeness of the IIC+ vs the lowly III. That was not my intention at all. My points about not being able to turn a III into IIC+ apply the other way, too... I once tried to add the R2 channel to my IIC+. I...

I think that you're making some assumptions that are leading you to wrong conclusions. In my opinion you have some overly strong assumptions about what is a IIC+, what is a red stripe and what is blue stripe. I don't think that anyone with authroity (ie, anyone from Mesa who's old enough to...

About 9 months ago, I pulled 4 of the STR 420's out of my 2:90 and put them in my 60/100 IIC+ (ie, not simulclass). For the previous 6 months, I had been using 4 new STR 440's direct from Mesa. I didn't really like the 440s. I liked the 420s a lot better. They were a bit softer-edged than...

Best post ever. Chip

Sure, its looks don't don't really please my eyes either, but when have you ever seen a Mark IV as a 2x12 combo? It is definitely unique. Chip

The treble-shift pull-pot is a mechanical switch that enables an LDR, which then acts like a switch to engage the extra capacitor that actually causes the change in sound. The trick is that the LDR is powered by a rail who is itself only powered (supposedly) during Lead mode (or maybe Lead+R2...

Oh, and eet fuk, you do have it right with regard to the pull shift on the presence knobs. Those pull functions (for R2 and Lead) only affect the response of the presence circuit. As you said, the presence circuit is not part of the pre-amp, but only affects the frequency response of the power...

Restless Rocks has it right. Pulling the gain knob on the lead channel is the one that adds the 750p cap to the treble. Here's the quote from the manual: "This LEAD GAIN control incorporates a PULL FAT for thickening the sound and saturating the signal further. This pull shift lowers the...

But did it work as modded? Chip

Hey that's a lot of work you did. Wow. Thanks for sharing! A couple of questions for you, though: 1) On P1.pdf, does the optional C30 really go to ground? On my Mark IIC(+), it goes up to the power supply rail (ie, it jumps around the 274K plate resistor on that tube stage). Does it really...

I've got a IIC that was upgraded to a IIC+ by MikeB at Mesa. It's got a 60/100 watt combo with GEQ and reverb. I use both the combo speaker and a Thiele cab that I have. After playing with it for a while I found that it didn't have quite enough sizzle for my taste. Therefore, I made a...