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- Instead of turning a potentiometer, the volume knob sends a signal to a switched resistor network. The volume setting determines which resistor is in the signal path, and therefore how much attenuation is provided. A software-driven microprocessor controls the knob's action.
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Dec 15, 2008 · The No.326S preamp is a huge step forward for Mark Levinson preamplifiers in resolution, transparency, and dimensionality. With less of an identifiable sonic signature, the No.326S is truer to the source, musically and sonically, than any previous ML preamp.
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Collecting and maintaining lab test and measurement instruments is a hobby of mine and I have a range of premium equipment that I use for the work I do. This type of gear is built for more demanding applications and long service life, is better engineered and has far fewer compromises than most consumer electronics. There is a lot to learn about el...
I’ll run you through a few of the high-end features here. So first, there’s the price. I can’t find the original sell price of the ML-7 in AUD or USD, but it was 1.2 million Yen, a cool $12,000 AUD, THEN!!! The ML-7A, which followed in 1986 was a cool $4595 USD. That was a heck of a lot of money nearly 40 years ago friends. More on the ML-7A, in St...
Like other serious preamplifiers, gain and loading are adjustable, the latter being added by way of a Fischer plug on the back panel. The idea is that you make up a plug/s containing resistive and capacitive values to suit your cartridge. This approach was common back in the day, but quite honestly, where four-pin Fischer plugs are involved, it’s a...
The owner of this beautiful Mark Levinson ML-7, from Busselton in WA’s southwest, sent me his preamp because it died. Specifically, it looked like a failure of the outboard power supply, the PLS-154. The LED indicators gave some clues: AC voltages were present, but none of the DC voltages necessary to run the ML-7 itself. This unit was originally p...
My focus was to fix the power supply first, and then find out if any faults remained. This was harder than expected, because of the damage inflicted previously and because there is no service documentation available, at least none that I could find. I started by disassembling the power supply to gain access to both sides of the two boards. I could ...
I’m pleased to say that she ran beautifully after I figured out what was wrong here and resolved the problems. The was all about the power supply, and with that sorted she sprang right back into life and ran perfectly. I listened to her briefly through headphones and my test setup and she sounded wonderful, even at 40+ years of age. You would expec...
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- Preamplifier
Apr 11, 2011 · Output connections on the Levinson No.28 preamplifier. With many amplifiers claiming to offer balanced line output, by passing a sample of the positive-going or ‘hot’ signal through a unity-gain inverting amplifier to create the negative-going or ‘cold’ side.
Sep 3, 2014 · Mark Levinson, one of the most respected names in audio, has just released their latest stereo preamplifier design, the N o 52. Its looks, handling, and performance are what you would expect from Levinson: Extraordinary. The N o 52 is in two chassis, one for the control section and one for the analog audio circuitry.
Apr 3, 2009 · Instead of turning a potentiometer, the volume knob sends a signal to a switched resistor network. The volume setting determines which resistor is in the signal path, and therefore how much attenuation is provided. A software-driven microprocessor controls the knob's action.
May 17, 2013 · The operational amplifier PP contains a bunch of components, including 17 transistors (JFET's and bipolars). Its circuit diagram can be found in the schematics. The D5 system is a bit more complex: a pre-preamplifier module named JC-1-SM is inserted before the PP op-amp.
Mark Levinson No.38 preamplifier System. Sidebar 2: System. I was particularly interested in hearing the No.38 after having spent some time with two other fully balanced preamplifiers: the $4495 Audio Research LS5 ($5990 with the BL2, the latter needed to accept single-ended inputs), and the $3495 Sonic Frontiers SFL-2.
