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Many of us "of a certain age" had our first real hi-fi experience as a result of building dynakits. They were well-designed and, in kit form, cheap enough for a student or newly-wed to afford. The instruction booklets were well-written and illustrated. Darn near fool-proof. My first project was a Dynaco ST-35 tube amp that cost $45 including the tubes! A few years later I stepped up to the ST-120 and although some would argue the ST-35 was a "sweeter" little amp the 120 was pretty ground-breaking in its day. I eventually sold both (along with a PAT-4) but a couple of years ago I decided to get a used ST-120 to restore. CSP member John O'Hanlon helped me find some replacements for the big capacitors but the amp had other issues so I put it aside until a couple of weeks ago. I was looking for mods and upgrades (the 40+ year old design does have shortcomings) when I stumbled across a gold mine! http://www.updatemydynaco.com/ is a great site that offers a load of upgrades and improvements for the ST-120. Long story short: I ordered every possible upgrade (the "Full Monty"), leaving only the original chassis, power cord, binding posts and transformer. I opted to spend an extra $10 for the amp modules used the AkitikA GT-101 power amplifier. The difference between those and the regular ST-120 replacements: 0.1% versus 1% gain setting resistors, 10,000 uF output capacitors versus 3300 uF output capacitors. I also bought the new heat sinks (very nice but unnecessary), power supply upgrade, power supply and C12 caps and a blue LED mod for the power switch (purely cosmetic). The prices were very reasonable IMHO (total was under $200). I installed new RCA jacks and new feet that I had on hand but those are also available on the site. Delivery was FAST. All of the parts are high quality and the new printed circuit boards are well-made and clearly labeled. Instructions (available on the site) are as clear and complete as the original Dynaco manual. Best of all: The owner/designer Dan Joffe provides super-fast helpful tech support (I had made one bone-headed goof). So today I finished the amp and after bringing it up on a Variac (just a precaution) I gave it the real test: Powering the AR-3a's. The 3a's are supposedly power-hungry and at 4 ohms they pose a tricky load. I played a variety of music: Jazz, Rock, Classical (including organ) at decible levels WAY higher than normal. They sounded great. And the amp wasn't stressed at all. The heat sinks got barely tepid and there was no hint of clipping. According to Dan, the updated modules put out more than 50 Watts, but a shade less than 60 Watts into 8 Ohms and nearly 90 Watts into 4 Ohms. I plan to take the amp to my favorite tech for testing but to my ears it's all good. A few photos below of before & after, and the amp being auditioned. IMHO the updatemydynaco kits are true heirs to the Dynaco legacy and Dan Joffe may be the latter day David Hafler. And the tech support is incredible. If you have a tired old ST-120 do yourself a favor and update it with one or more of these modules. Don't have an ST-120? The AkitikA GT-101 provides the chassis and a modern torroidal transformer. Updatemydynaco also sells some modules and upgrades for the PAT-4 preamp, SCA-80 integrated amp and the mighty ST-400. Makes me sorry I sold my old PAT-4! I have no connection with this outfit--just a really satisfied customer. -Kent
Hello People, A very dear friend of mine from Nashville, Tennessee is looking for a Amplifier for a a AR-2ax he bought recently. I'm trying to help him find an Amplifier at a reasonable price. He is looking for a simple but clean Integrated amp with or without a Phono (although that would be a bonus). Any leads, kind people? Regards, Sudhir
McIntosh MC252 Power Amplifier $3200 Voltage: 120V Cosmetic Description: 9/10 Excellent condition with no notable blemishes. What is Included: Amplifier, Remote, Manual, Factory packaging Functional Notes: Operational condition of this item is excellent, fully tested and no issues found. Overview Compact yet powerful, the McIntosh MC252 continues a tradition of classic McIntosh amplifier design. Cool and quiet in operation while rewarding to listen to, MC252 is the McIntosh value amplifier. With 250 watts per channel at 0.005% maximum distortion across the entire audio spectrum, the MC252 delivers a tremendous amount of clean power. McIntosh’s exclusive Output Autoformer ensures the amplifier will always deliver full power, without stress, to any type of loudspeaker. Whether the speakers used are 2, 4, or 8-Ohms, McIntosh Autoformers ensure that every bit of power is utilized. Superior, fuse-less short circuit protection is provided by the McIntosh Sentry Monitor circuit. Power Guard, an input/output comparator, responds within 1/1000 of a second to eliminate amplifier clipping. A polished stainless steel chassis, premium glass front panel with fiber-optic / LED frontpanel illumination and True Power Peak Responding Wattmeters lend a look of pure elegance to this powerful amplifier. Features Waveform comparison circuit continuously monitors both input and output signals to avoid clipping while preventing harsh sounding distortion. Fuse-less short-circuit protection circuit disengages the output stage before current exceeds safe operating level – resets automatically. Unique McIntosh Autoformer technology delivers the full rated amplifier output with the least possible distortion into loudspeaker impedances of 2, 4, or 8 Ohms. Swift, accurate Wattmeter response reveals program peaks so staying within the power limits of your loudspeakers is easy. The two 250 watt channels may be combined into a single channel of 500 watts. McIntosh exclusive output autoformers allow this 500 watts to be delivered into 1, 2, 4, 8, or 16 Ohm speakers. Specifications Power Output: 250 Watts at 2, 4, or 8 Ohms x2; 500 Watts at 4, 8, or 16 Ohms. Bandwidth: 10 Hz to 100 kHz. Sound to Noise: 112dB. Dimensions: 9 7/16” x 17 1/2” x 14 13/16”, 94-1/2 lbs SPECIFICATIONS: Power Output Stereo Minimum sine wave continuous average power output per channel, all channels operating is: 250 watts into 2 ohm load 250 watts into 4 ohm load 250 watts into 8 ohm load Power Output Mono Bridged Minimum sine wave continuous average power output is: 500 watts into 4 ohm load 500 watts into 8 ohm load 500 watts into 16 ohm load Power Output Mono Bi-Amp (Parallel) Minimum sine wave continuous average power output is: 500 watts into 1 ohm load 500 watts into 2 ohm load 500 watts into 4 ohm load Output Load Impedance 2, 4 or 8 ohms (Stereo Mode) 1, 2, 4, 8 or 16 ohms (Mono Modes) Rated Power Band 20Hz to 20,000Hz Total Harmonic Distortion Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is 0.005% Intermodulation Distortion Maximum Intermodulation Distortion if instantaneous peak output per channel does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz, with all channels operating is 0.005% Dynamic Headroom 2.0dB Frequency Response +0, -0.25dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 100,000Hz Sensitivity 1.6 Volts Unbalanced Input 3.2 Volts Balanced Input A-Weighted Signal To Noise Ratio 112dB below rated output Input Impedance 10,000 ohms Unbalanced Inputs 20,000 ohms Balanced Inputs Wide Band Damping Factor Greater than 40 Power Requirements 100 Volts, 50/60Hz at 8.0 amps 110 Volts, 50/60Hz at 7.2 amps 120 Volts, 50/60Hz at 6.6 amps 220 Volts, 50/60Hz at 3.3 amps 230 Volts, 50/60Hz at 3.3 amps 240 Volts, 50/60Hz at 3.3 amps Note: Refer to the rear panel of the MC252 for the correct voltage. Overall Dimensions Width: 17-1/2 inches (44.45cm) Height: 9-7/16 inches (23.97cm) including feet Depth: 14-13/16 inches (37.62cm) including the Front Panel and Knobs firstname.lastname@example.org
I am unloading my Adcom amps. 2 GFA5500's along with the very nice accompanying preamp GFP-565. I purchased these in the past 2 years to use with my AR3's, 9's and other larger current demanding speakers. They have been great and I have no complaints. They handled those speakers easily. Been using them in a passive vertical bi-amp configuration with the 9's and ADS L1590's. One of the amps has the original box. Both are cosmetically great with one having a dinged top right corner (more like a chip) that is frankly easy to ignore. The preamp is often considered one of Adcoms best ever and is a great match with the amps. I have the manual for it. The phono section is highly regarded and does sounds nice with my Denon DP62L turntable running through it. It is probably ready for a little deoxit on the volume control as I occasionally get a little scratch when adjusting it. Just have not got round to it. As far as pricing, individually I would like to get $400 for each amp. If you purchase both it would be $750. The pre is $225 on it's own or $200 if purchased with the amps. $900 if you go with all 3. All is plus shipping of course. I don't mind shipping and I have great shipping pricing (probably half of what you get) via UPS. I would add a few bucks for any shipping material I might need. Let me know and I can fill you in with any other details and photos.