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Marantz 2250B opgraderet og renoveret
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13.000 kr.
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Varebeskrivelse
Mærke: Marantz
2 x 64watt i 8 ohm belastningstestet, begge kanaler drevet samtidigt, sidste billede.
Omfattende renoveret og opgraderet.
38 kondensatorer er udskiftet til Nichicon MUSE, Fine Gold Audio samt WIMA MKS film.
Heraf 8 tantalkondensatorer i signalvejen, som ofte giver støj og driftsproblemer.
Strømforsyningen er opgraderet fra 2x10000uf til 2x15000uf Nichicon Gold Tune Audio som giver bedre stabilitet og mere kontrolleret greb om bassen.
33 transistorer udskiftet.
Udskiftningerne forbedrer driftsikkerheden uden at ændre den oprindelige lydkarakter.
De nye transistorer er udmålt, og hvor kredsløbet kræver det, parvist matchet for optimal stabilitet.
De originale typer er kendt for støj og fejl med alderen og derfor erstattet med mere robuste og støjsvage alternativer.
Udgangstransistorerne er udskiftet med kraftigere typer og genmonteret med Kapton isoleringsskiver som giver bedre varmeledning end glimmerskiver med udtørret kølepasta.
Med årene tørrer kølepasta ud, hvilket kan give for stor termisk modstand og i værste fald afbrændt udgangstrin, et kendt problem på +50 år gamle maskiner.
4 trimmepotentiometre i udgangstrin udskiftet til mere robuste typer.
Højttalerrelæet udskiftet til Omron audiorelæ
Dette sikrer perfekte kontaktflader og stabil drift i mange år frem.
16 glødelamper for skala/metre, nålelys og indgange skiftet til varmhvide LED, samme farve som de gamle glødepærer og har meget lang levetid.
Lampehusene mørner med varmen fra glødelamper, derfor.
Omstillet til 240VAC for længere levetid.
Kalibrering af bias, DC offset og strømforsyning.
FM tuneren kalibreret, tager stereo helt perfekt med bare en stump ledning som antenne.
Alle potentiometre og omskiftere renset og smurt med DeoxIt
Knapper og forplade er nænsomt renset i sæbevand.
Det originale trækabinet har fået den gamle gulnede klarlak fjernet, pudset op og olieret med Skovgaard træolie.
Specielt for “B” modellen:
Bedre riaa, separate tonekontroller for hhv venstre/højre side.
Dobbelt balance potentiometer for bedre kanalseparation.
Alle billeder viser min Marantz årgang 1976, fra start til slut i processen.
En omfattende renovering som realistisk kan sikre mange års problemfri drift, deraf prisen.
Alt arbejde er udført af faguddannet elektronikmekaniker med mere end 45 års erfaring i analog elektronik.
Forsendelse mulig.
HENVENDELSE KUN PÅ 61518137, FAST PRIS, (English below).
Evt. kan Accuphase E-202 indgå som delbetaling.
Købere opfordres til at efterspørge dokumentation for udført arbejde, komponentudskiftninger og målinger.
Uden dokumentation er det ofte vanskeligt at vurdere omfanget af en restaurering.
2 x 64 watts into 8 ohms, load tested with both channels driven simultaneously, as shown in the last photo.
Extensively restored and upgraded.
38 capacitors have been replaced with Nichicon MUSE, Fine Gold Audio and WIMA MKS film capacitors.
This includes 8 tantalum capacitors in the signal path, which are known to cause noise and reliability problems with age.
The power supply has been upgraded from 2 x 10,000uF to 2 x 15,000uF Nichicon Gold Tune Audio capacitors, providing improved stability and better controlled bass.
33 transistors have been replaced.
These replacements improve long term reliability without changing the original sound character.
The new transistors have been individually measured and, where required by the circuit, matched in pairs for optimum stability.
The original transistor types are known to become noisy and unreliable with age and have therefore been replaced with more robust, low noise alternatives.
The output transistors have been replaced with higher rated types and refitted using Kapton insulating pads, providing better thermal transfer than mica insulators with old, dried out thermal compound.
Over the years, thermal compound dries out and can cause excessive thermal resistance and, in the worst case, output stage failure – a known problem in equipment more than 50 years old.
4 adjustment trimmers in the output stages have been replaced with more robust types.
The speaker protection relay has been replaced with an Omron audio relay, ensuring clean contact surfaces and reliable operation for many years to come.
16 incandescent lamps for the dial, meters, pointer and input indicators have been replaced with warm white LEDs. They provide the same warm colour as the original lamps while offering a very long service life.
The original lamp housings tend to deteriorate from the heat generated by incandescent lamps, which is another reason for the conversion.
Converted to 240VAC operation for longer service life.
Bias, DC offset and power supply calibrated.
The FM tuner has been calibrated and receives FM stereo perfectly with only a short piece of wire used as an antenna.
All potentiometers and switches have been cleaned and lubricated with DeoxIT.
The knobs and front panel have been carefully cleaned by hand using mild soapy water.
The original wooden cabinet has had the old yellowed clear lacquer carefully removed, then refinished and treated with Skovgaard wood oil.
Special features of the “B” model:
Improved phono stage, separate tone controls for the left and right channels and a dual balance potentiometer for improved channel separation.
All photos show this actual 1976 Marantz, from the beginning to the end of the restoration process.
This is a comprehensive restoration intended to provide many years of reliable operation, which is reflected in the price.
All work has been carried out by a qualified electronics technician with more than 45 years of experience in analogue electronics.
Shipping possible.
CONTACT ONLY ON 61518137. FIXED PRICE.
An Accuphase E-202 may possibly be accepted as part payment.
Buyers are encouraged to ask for documentation of restoration work, component replacements and measurements.
Without documentation, it is often difficult to determine the true extent of a restoration.
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Sidst redigeret: 21.8.2026 kl. 15:32 ・ Annonce-ID: 24176146
