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I couldn't resist! After (briefly) having a NAC 52 in my system a couple of years ago, I got 'the hunger' again and this is the result. It's an exhilarating listen!
I have been a busy box swapper over Christmas, and this is the crowning glory: the most stunning preamplifier I have ever heard in my life! 'Pure' is the operative word here. It has a wonderfully unforced, natural and organic sound with a freedom from grain and artifice that I have never heard before. It makes other preamps sound coloured, crude and veiled. Surprisingly, it also handles dynamics with aplomb, something that you don't normally associate with passive preamplifiers. (This is a TVC preamp) It doesn't get much better than this folks!
KT
My latest reference system, a Parasound P/LD-1500 Line Drive Preamplifier and a HCA-1200MKII High Current Power Amplifier.
About 9 years ago I bought this NAP110 power amplifier together with a NAC42XO preamplifier. The preamplifier turned out to be in working order, but the power amplifier was not. I tried to fix it myself, but my skills were not good enough. In the end I converted it into a power supply for a NAC12 preamplifier, using an Avondale TPR2 module. That's how it's been working all these 9 years. However, recently a hi-fi audio designer unexpectedly offered me his services to repair this amplifier. It took him about an hour to make the repair, and some more time to reassemble the unit and order and install new capacitors in the power supply. And now the unit is back in business.
Thank you, Anton!
If you're interested, here's a link to the website of this audio equipment designer. You might like some of their products:
About 9 years ago I bought this NAP110 power amplifier together with a NAC42XO preamplifier. The preamplifier turned out to be in working order, but the power amplifier was not. I tried to fix it myself, but my skills were not good enough. In the end I converted it into a power supply for a NAC12 preamplifier, using an Avondale TPR2 module. That's how it's been working all these 9 years. However, recently a hi-fi audio designer unexpectedly offered me his services to repair this amplifier. It took him about an hour to make the repair, and some more time to reassemble the unit and order and install new capacitors in the power supply. And now the unit is back in business.
Thank you, Anton!
If you're interested, here's a link to the website of this audio equipment designer. You might like some of their products:
£8,995.
McIntosh MA352
The MA352 Integrated Amplifier is a hybrid design that combines the finest of vacuum tube and solid state audio design principles. The result is an eye-catching amplifier that enjoys the best of these two opposing audio philosophies all while reproducing music at the highest quality level.
An all-analog design, the MA352 has a vacuum tube preamplifier section that is powered by a pair of 12AX7A and a pair of 12AT7 vacuum tubes; its output stage is a direct coupled solid state amplifier that outputs 200 Watts per channel into 8 Ohm speakers or 320 Watts per channel into 4 Ohm speakers – enough power to properly drive virtually any set of loudspeakers. Dual scale blue Watt meters give an accurate readout of power output for both speaker impedances.
The MA352 has 2 balanced and 3 unbalanced inputs plus 1 Moving Magnet phono input with adjustable loading for connecting a turntable. It has gold-plated speaker binding posts to help prevent corrosion and ensure a quality signal is sent over your speaker cables to your speakers. A stereo preamplifier output is available for connecting a higher-powered amplifier; it can also be used to connect 1 or 2 powered subwoofers for added low frequency performance.
The MA352 is packed with numerous McIntosh technologies including:
The patented Power Guard® technology that monitors the output signal for over driving and makes real time micro adjustments to the input signal to prevent harsh sounding clipping that could potentially damage your speakers
Fuse-less short-circuit protection circuit Sentry Monitor™ that will disengage the output stage before current exceeds safe operating levels and then resets automatically when operating conditions return to normal
McIntosh Monogrammed Heatsinks™ which are connected to advanced high current output transistors that minimize thermal equilibrium lag (or warm-up) time
High Drive headphone amplifier with Headphone Crossfeed Director (HXD®)
A 5-band analog tone control allows for manual adjustment of your favorite recordings (each band adjustable by ± 12dB)
Home Theater Pass Through lets it be seamlessly integrated into a home theater system
Power Control to send power on/off signals to connected McIntosh components for easy system power up and shutdown
Data Ports to send remote control commands to connected source components
The unit sits on a stainless steel chassis polished to a mirror finish; vintage McIntosh-styled die cast aluminum name badges are affixed to each side. Blue output meters, control knobs, an illuminated logo, and a black glass front panel with direct LED backlighting complete the unit. It can be paired with an assortment of CD players, turntables, tuners, media streamers and speakers to complete your home audio system.
Just spent the last couple hours setting up new DV20x2L, after adding the Michael Lim stainless-steel shim to my RB-303 and busting out Don's protractor... let's see how it sounds!
Latest acquisition: Battery powered pre-amp - Crimson Elektrik 510. I'll probably use it as part of a 2nd system.
Bottom: VAC Statement Line Preamplifier ($80k)
Second from Top: dcs Vivaldi Master Clock ($19.5k)
Top: dcs Vivaldi DAC ($46.5k)
I've done my first ever tuberoll on Altima T5 V2.0
These GE5564W's are much smaller than the 6K4's.
The GE's sound a little tighter, but more bass. It's tricky to hear, but I'll swap after a couple of weeks and report back.
When opened up fully the GE's seem to deteriorate in holder the audio together.
Quick marketing speak:
The GE5654 is a dual triode vacuum tube that can be used as a preamplifier or audio amplifier. It is a military grade tube that can replace 6AK5, 6J1, or EF95 tubes. It is often used in valve amplifiers for high-quality sound.
Sutherland Engineering Ph3D battery-powered phono stage. The Absolute Sound's "Phono stage of the Year," and "Editor's Choice."
Specifications
Year 1975
Head Configuration
2 Head Design
Connectivity
DIN Input/Output Connector
Headphones
2 Mono Microphone Inputs
RCA Input/Output Connectors
Transport
Single Capstan Transport
Belt Drive (Capstan)
Mechanical Tape Loading
Auto Shutoff
Tape
Chrome Tape Capability
Ferro-Chrome Tape Capability
Normal Tape Capability
Manual Tape Type Selection
Display
3-Digit Mechanical Counter
Analog Needle Meters
Preamplifier
Individual Input Level Controls
Operation
Mechanical Transport Control
Memory Stop
Exterior
Top Loading
Orientation Right
Indicators
Tape Run Indicator
Peak Indicator
Record Indicator
Electronics
Peak Limiter
General
Stereo
Speed
1⅞ ips - 4.76 cm/s
Alternating Current (AC) supply 110 − 240 Volt
Materials wooden case
Dimensions (WHD) 440 x 230 x 105 mm
source from www.vintagecassette.com
Full analog preamplifier sold from 1990-1994. This unit uses a total of 22,000uf of filtration! More than many power amplifiers/receivers sold today.
Digitally controlled 5.1 channel audio preamplifier system to increase the gain of the multi-channel PC sound cards.
This preamplifier is an open hardware project. All source codes, KiCAD design files, and compiled binaries are available on the jayakody2000lk.blogspot.com/2021/11/51-channel-preamplifi...
QUAD mono Hi Fi system, from the Acoustical Manufacturing Company, circa 1957, including a QUAD II Power Amplifier, FM Tuner and the QUAD ESL electrostatic loudspeaker, seen on display in the National Museum of Scotland, Edinburgh.
This image appears in the Edinburgh Style pool.
After a wait of just over four months, my M1 RIAA has arrived, along with another set of 1m AN UK Lexus interconnects!
Sutherland Engineering Ph3D battery-powered phono stage. The Absolute Sound's "Phono stage of the Year," and "Editor's Choice."
National Mexicana, S.A., was founded in 1967 by Matsushita Electric of Japan and the mexican Grupo Industrial Guindi, locating the manufacturing plant in 22 Toluca Boulevard, Naucalpan de Juárez, Estado de Mexico. At the end 60´s and during 70´s National Mexicana, S.A., manufactured several models, from pocket to table top radios and some with turntable.
This particular radio was released in 1969 under Modelo 113 (KAMPESINO) and seem to be produced at list during ten years. By design the base is likely to break easily, which makes difficult to find without damage. It has two ways power supply (designed DUAL MATIC by National Mexicana): 115-135 VAC or four "D" batteries; also has leads to connect external antenna.
This one is in pristine condition and has its cardboard box, instruction manual, warranty and transparent plastic bag wrap. The chassis has one integrated circuit TBA570A (Conversor, F.I, Detector, Audio Preamplifier), two silicon transistor BC328 in Audio Power, one diode 1N4548 (Estabilizer) and two diodes A-7 as Rectifier.
A Stunning Sound Experience.
The MC451 Dual Mono Amplifier joins the MC901 in offering the ultimate solution to bi-amping a loudspeaker. Like the MC901, the MC451 uses our Hybrid Drive™ technology that combines a separate vacuum tube and solid state amplifier onto one single chassis to produce the best possible sound performance from a bi-ampable speaker. Unlike the larger MC901, the MC451 has a more conventional McIntosh form factor and size, allowing it to fit into home audio systems, racks, and furniture more easily. Adding a pair of MC451s to your stereo system will allow your prized speakers to perform like never before.
A pair of MC451 Dual Mono Amplifiers powering a home audio system with bi-ampable XRT1.1K speakers.
The MC451 is comprised of a 150 Watt vacuum tube amplifier and a 300 Watt solid state amplifier, which is more than enough power to drive virtually all speakers.
The vacuum tube section drives the speaker's midranges and tweeters, while the solid state section drives the woofers. The 150 Watt vacuum tube amplifier is powered by four KT88 output tubes which are located under a removable wire cage, plus two 12AT7 and one 12AX7A signal tubes; it uses our patented Unity Coupled Circuit output transformer to deliver its full 150 Watts into almost any speaker regardless if it has 2, 4 or 8 Ohm impedance.
Similarly, the 300 Watt solid state amplifier delivers its full 300 Watts into a 2, 4 or 8 Ohm impedance speaker via our Autoformer™ technology.
The two amplifiers in the MC451 are designed to work together in a synergistic relationship and are specifically engineered to assure that each only amplifies its intended frequencies. The large but quiet toroidal transformer generates enough power so that neither amplifier robs power or performance from the other. All of this results in easy bi-amping with unparalleled performance and sound reproduction from your speakers.
Bi-amping your speakers with the MC451 is easy. No longer do you need fiddle with two separate amplifiers, an external crossover, and a lot of trial and error to properly configure the two separate amplifiers with often times only so-so results. The MC451 solves these hassles thanks to its internal, adjustable crossover. The MC451’s crossover tailors the output frequency range of each amplifier section to the attached loudspeaker. Simply set the CROSSOVER POINT knob on the back of the MC451 to the loudspeaker’s crossover point, then frequencies below the crossover point will be sent to the solid state amplifier and frequencies above it will be sent to the vacuum tube amplifier.
This adjustable crossover allows you to optimize the performance of both amplifier sections to your speaker's specifications and to your listening preferences. Gain levels for the vacuum tube amplifier can be adjusted from -6dB to +3dB. A direct feed can also be connected to each amplifier section, thus bypassing the internal crossover.
The MC451 features our DualView™ Power Output Meter. The DualView meter features two of our traditional, fast responding mechanical meters stacked above and below each other in a single meter window; one meter is dedicated to the 150 Watt vacuum tube amp and the other to the 300 Watt solid state amp. Each meter operates independently of the other and displays the real time power reading of each amplifier section.
McIntosh MC451 Amplifier
In addition to everything already mentioned, the MC451 comes with a multitude of other McIntosh amplifier the technologies:
Power Guard® that monitors and adjusts the input signal in the 300 Watt solid state amplifier section in real time, then makes inconspicuous volume adjustments to prevent harsh sounding distortion and potential speaker damaging clipping.
Power Guard Screen Grid Sensor® (SGS). The 150 Watt vacuum tube amplifier section features our Power Guard SGS® technology. Power Guard SGS helps prevent premature vacuum tube failure by monitoring the screen grid current in the KT88 output vacuum tubes. If the current becomes too high, a circuit in Power Guard SGS is activated which then dynamically attenuates the input signal in real time to keep the vacuum tubes operating at safe levels.
Sentry Monitor™ observes the output current and shuts the amplifier off if it ever exceeds safe limits.
Power Control that can send power on/off signals to other connected McIntosh components for easy system power up and shutdown.
Our patented, gold-plated Solid Cinch™ speaker binding posts that easily and securely attach the speaker cables.
A McIntosh Monogrammed Heatsink™ that is connected to advanced high current output transistors to efficiently cool the solid state amplifier section.
Our Power Management System that will turn the entire unit off after a set amount of time when no input signal has been detected.
The uncompromising fit and finish of the MC451 is highlighted by familiar McIntosh design cues. The front features a signature black glass faceplate with three clear windows that allow viewing of the vacuum tubes, the DualView meter, two rotary control knobs, an illuminated logo and lettering, and built-in aluminum handles. The top is highlighted by a series of block diagrams printed on glass inserts outlining the circuitry and specifications of the unit. All of this sits atop of stainless steel chassis that's been polished to a pristine mirror finish.
The MC451 amplifier can be combined with a variety of preamplifiers, turntables, CD players, media streamers, speakers, and other specialty products to form a complete home audio system designed for bi-amping loudspeakers. Contact your local dealer to learn more.
My Kenwood C1 Restomod project. Basically a recapping and also component upgrade. Credit where credit is due: I followed the path that Leestereo took: audiokarma.org/forums/index.php?threads/kenwood-basic-c1-...
Power Amplifiers Model 520 (top) and Model 530 (bottom left) with Preamplifier Model 510 Preamplifier (bottom right).
Note the larger, black heatsink on the more powerful Model 530 mono power amp.
Top left: MBL 1621 cd transport ($31.5k).
Top Right: MBL 1611 processor ($32.7k)
Bottom Right: MBL 6010 D preamplifier ($30k)
Highly recommended component isolation system. Used in conjunction with one another, my system has experienced a profoundly noticeable drop in the noise floor, with corresponding improvements in bass, midrange and treble. IMHO they help get you closer to the music by letting your components perform free of vibration and unwanted resonance.