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May 17, 2013 · 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. It allows the gain to be about twice as much as the above design (from 30 to 60dB).
This is a user review of the Mark Levinson No.28 preamplifier. Despite bearing the Mark Levinson name, the design was made after Madrigal had bought out the Levinson brand and design rights. It also explains the change of the model number designation from “ML xx” to “No. xx”.
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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...
As always, thank you for visiting and for your ongoing support. I hope you enjoyed this article on another rare and unusual piece of hi-fi history. It helps me a lot when people like, share and subscribe, and you can buy me a drink, or make a donation to help support the production of more content like this… Or bring me your hi-fi gear to repair! I...
- Preamplifier
The No.38 exhibited extraordinary technical performance on the bench—its measurements were as good as preamplifiers get. First, I measured an input impedance of between 95k ohms and 115k ohms at the balanced inputs, within measurement error of the specified 100k ohms.
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.
May 17, 2013 · ML-1 | Preamplifier | 1977 - 1980. Presentation: The ML1 preamplifier with its unique design and performances was one of the best preamplifier of its time and still is despite the difficulty of repair.
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The Nº52 is unquestionably the finest Mark Levinson preamplifier ever. This dual-monaural preamplifier isolates the critical analog audio circuitry from the control section with a two-chassis approach to provide the purest signal paths possible.
