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FS: Richard Marsh Headphone Amplifier
FS: Richard Marsh Headphone Amplifier
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Old 16th January 2018, 01:36 PM   #1
BamboszeK is offline BamboszeK  Poland
diyAudio Member
Join Date: Jun 2012
Default FS: Richard Marsh Headphone Amplifier

On offer: Richard Marsh Headphone Amplfier - fully finished unit.
Transistor kit and PCB bought from TechDIY, rest parts mostly from mouser so everything is genuine.
Input JFETs are 2N5457/2N5460, 2N5087/2N5088 and output 2SB649 & 2SD669 tightly matched by Jack. I've used only highest quality parts. All resistors are 0.1% 15ppm by Vishay or TE except higher wattage Panasonics ERG/ERX. Potentiometer is Alps RK27 10k. Electrolytics capacitors are Panasonic FM/FC and Chemicon KZH. Interial cabling is routed with Canare L-4E5C to gold plated connectors. The power supply is based at two TL1963A low noise regulators running at +15V / -15V. Due using same polarity LDOs in floating configuration difference between rails is marginal - like 5-10mV. This paired with 0.1% 15ppm resistors, tightly matched transistors and carefully set trimpots results in vanishingly low DC offset and distortion. I've measured 0.00059% THD (1V RMS, 274R resistive load) in my unit probably limited with testing rig.
The amplifier sounds really good. Clear, natural tone, deep and tightly controlled bass with great soundstage. Together with The Wire it is best amplifier which I ever heard.
Feel free to PM me if you have any questions.
Price - 230 EUR
If someone is willing to buy it in this week I can provide discount.
I'm located in Poland, willing to send anywhere in the world, just keep in mind that transformer is for 230V. Payment by PayPal or bank transfer in EUR/USD/PLN.
Shipping with courier in Europe would be about 16-24 EUR depending on country. Ask me for exact amount.
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Old 1st February 2018, 10:47 PM   #2
BamboszeK is offline BamboszeK  Poland
diyAudio Member
Join Date: Jun 2012
Bump I will consider every serious offer.
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