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I am working on an 18. The stereo light would not come on. I tried adjusting the threshold but no joy. I could tell someone had adjusted L501 as the bees wax was gone. I tweaked it a bit and the stereo lamp came on. Being a tuner noob I don't know what L501 is doing. Is there anything critical...

I have one that the coil has gone high resistance. Has anyone had luck with repair service or replacement? Tony

I am having issues with a Luxman RX-102 tuner. No FM without mute off, no signal meter or stereo indicator. So far I can see that I have voltage for signal strength to the input of R726. It is basically 0 at the out of R726. It does change when adjusting VR702. The FM shares the same signal...

Cap 527 is a tantalum. The first picture is of two boards from different amps. It looks to me that the blue one is plus to the left and the tan one the dot says the plus is to the right from what I read. The board layout shows the plus going to the signal shield and the schematic shows the...

Has anyone ever replaced them with modern? Original is a Sigma 6 Volt DC 1 amp. Coil is 400Ω. Pulls in at around 5.1 volts and draws .015amps. Tony

Has anyone come up with a good sub for 2sc830 outputs? Type Designator: 2SC830 Material of Transistor: Si Polarity: NPN Maximum Collector Power Dissipation (Pc): 25 W Maximum Collector-Base Voltage |Vcb|: 50 V Maximum Collector-Emitter Voltage |Vce|: 50 V Maximum Emitter-Base Voltage...

I bought an HP 8903 Audio Analyzer from Ray Gianelli. Vary easy deal. It was great to finally meet. Tony

Dose anyone know a replacement for L308. I think it is a .15uh variable choke. The one in my unit had something all up in it. I cleaned it up and I can almost get the tuning adjusted but it freaks out when I get it almost dialed in. Any help would be appreciated. Tony

Tinman came through with a great HP 334A. Well packaged and shipped quickly. Thanks Tinman. Tony

I have a 26 with blown 2SD257s. KSC2334Y look like they should work. Has anyone tried them? Any other ideas? Tony

I am working on a 1200 that had both amps at the rail voltage. Little Diode is the only place I can find 2N5961s at about $40.00 for ten. I read a post from 2009 by EchoWars stating that ZTX694B was also a good sub. I did not see anyone report the successful use of the ZTX694B. If anyone knows...

Does anyone know where I can find a clean copy. The free copy is hard to make out the board pictures. Tony

Ray is great to deal with. Does a fantastic job with packing as well. Thanks Ray Tony

I pickup a pair of DQ-10s from Steve a fews ago. As alway easy to deal with and he is happy to show all of his cool collection. Thanks Steve Tony

I started working on this 15 sometime ago http://www.audiokarma.org/forums/index.php?threads/marantz-model-fifteen-repair.645700/. I ordered some parts then never got back to it. Well I got it back together and it plays music and runs cool. However the bias will not come up and I have ~+6 volts...

I bought some Sylvania 6L6GC from Ryan. I am very pleased with the tubes. Shipping was fast and well packed. Tony

Marantz Model 18 SN# 18-5591 Before It takes some modification but I think this switch https://www.mouser.com/ProductDetail/979-100.1201 worked out pretty well. First I tweaked the terminals and trimmed the bakelite to make it fit so that on and off were in the correct position. Then I...

I have a shorted MC34004BP looking for opinions on a substitute. link to data sheet https://pdf1.alldatasheet.com/datasheet-pdf/view/12068/ONSEMI/MC34004BP.html Thanks Tony

Don't assume that because Marantz boards have the same numbers that Marantz used the same voltage to feed that board in all units. Some one gave me a 2010 that looked like the house it was in had a fire. Black all over the boards and the plastic inside some of the knobs had melted. The tuner was...

I bought a Marantz 2325 from ccheath. It was a very smooth transaction. It was also the very best packing job I have see. Do not hesitate in dealing with ccheath. Tony

I am at a standstill and don't know where to look next. The issue is when the unit is turned on there is a hum for a few second. Then the relay opens closes and then it plays fine. The voltage on the right channel goes up until the relay opens then goes near zero and plays well. Driver board...

Just an FYI. https://www.cepro.com/article/thiel_closes_speakers_coherent_source_service?utm_source=CEPWeekly&utm_medium=email&utm_campaign=content&eid=343805877&bid=2004633 Tony

I picked up an 18 with no transformer. I have a shorted transformer from a parts unit that I would like to have rewound. I was hoping to hear from someone that had a rewind turn out well. Tony

I picked up a new to me Hameg HM203-6 Oscilloscope from Tinman. It is great, very clean. It took a lot of work to get the unit out of the packing but it made the trip in perfect shape. Thanks Tinman Tony

I picked up an 18 (18-3012) from @nolasally and it needs some work. What I know so far Scope is dead Voltages to the scope board are good One of the fets Q1201/4 had been replaced with a depletion mode mosfet. Scope driver board done. Found bad vertical trim pot. Scope is now working...