Pentodes on the other hand produce quite a lot of third harmonic distortion, which tends to sound growly or biting. Since the Dean Markley amps have a similar tone control circuit, these amps will have a similar mid-frequency notch.įender amps also seem to have favoured beam power tetrodes for the output tubes rather than the pentodes used in European designs, and it turns out the two types of tubes tend to have different sounds: beam tetrodes produce a lot more second harmonic distortion (which usually sounds warm or shimmering), but very little third harmonic distortion. The CD 120 schematic shows one common shared set of tone controls between clean and drive channels - is that the case for your amp? No independent bass, mid, treble controls for the two channels?Ĭlick to expand.I believe part of what we have all come to recognize as a good clean tone is a characteristic mid-frequency notch that Fender designed into his tone control circuitry, and which we have all heard on thousands of era-defining songs. I don't fully understand why the Dean Markley design is so much more effective than the Fender design, probably because I don't fully understand the Fender tone stack design either. The tone control circuitry looks superficially like the Fender design, but with a few changes, including the addition of those "mid boost" and "bright" switches. The CD 120 schematic also shows "mid boost" and "bright" switches in the clean channel. In the rolled-off position it appears to reduce frequencies below 340 Hz. In one position the voicing switch rolls off the bass, in the other position you have a flat frequency response. The CD 120 schematics I found do show an "overdrive voicing" switch, but it's in the drive channel, not the clean one. I also found references to the fact that all three amps in the CD series shared a lot of their circuit design. I couldn't find any schematics for the CD 30 or CD 60, but did find some hand-drawn schematics for the CD 120. soon, but I want to keep this one around as well.Click to expand.Kinda sorta. It's kinda loud for bedroom use so I'm hoping to pick up an Epi Valve Jr. I've come to the conclusion that these live and die by the tube, so should I swap it for a 12AX7A? Any suggestions would be great. The amp's in really good shape, and supposedly had one of the caps replaced a while back. I replaced it with a Tung Sol 12AX7 and now it starts to distort past 1. At first, the A channel would stay clean with the preamp knob at 7-8. I bought it cheap and it had a GE 12AX7A in it that was worn out. I have also tried an EQ pedal after the guitar, after the dirt, and two EQ pedals with one on each end. It's almost like the tones splitting and everything sounds like fuzz. As soon as I kick on the distortion, it sounds buzzy and flat no matter how much I tweak the EQ. The only one that sounds half decent is the Muff. The TB sounds the worst, believe it or not. The pedals I'm using are a Tonebone Classic, Analogman DS-1 Pro, and a Big Muff.not exactly junk. It has great clean tones but I can't seem to get any good distortion (pedals) out of it. I have an RM-80-DR head hooked up to 2x12 cab with Vintage 30's. Maybe one of you DM guys could help me out here. I'm glad to see the last post on here isn't too old before I bumped it. Looking forward to any recommendations you might be able to provide. I was thinking of picking up a 2 x 12 cabinet and loading it with a couple celestions, but then I saw the dang vintage 30's were going like $150 each and thought, hell, I wasn't planning on spending $500 or better to upgrade the speaker, so, while a 2 x 12 might give a smoother sound, I'll be happy to just replace the one 12 in the amp at this point I think, but ultimately it's a matter of finding a speaker that speaks well and allows the responsiveness of the amp to come through But there's just so many out there to choose from, and I was wondering what anyone else might be using in their CD series amps, especially those who might have a CD-120, that's giving them satisfaction with singing highs, clear harmonics when playing clean, and a good midrange growl when the gain is turned up. The Celestion Vintage 30's sound good, as do the Celestion Classic Lead's. I've thinking it's most likely going to be a Celestions or a Scumback, as pretty much all of them beat the pants off of the EVM. So, having recently found this fine ongoing Dean Markley amp thread in the forum here I thought I'd ask - what speaker would be a good choice to replace that EVM-12L in the CD-120 with?
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