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Marantz SR18 I would like to know if you can sell me 4 resistors .1ohmx2 5watts(bias resistor) it seem that it's verry hard to get Thank's

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Re: marantz SR18 - Audio & Video Receivers

Buy the part from Marantz.

Posted on Jan 12, 2008

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Integra 7.8 display bad

The bad resistor is on the ps board that drives the display, well on mine at least. The resistor is supposed to be 10 ohms at 1/8 watt "i think" i replaced it with a 1/2 watt resistor. Either way its R9310. the board is right behind the display on the right side just behind the volume knob. when open and looking from the back you see it just fine. it's not hard to get out. fairly simple to fix. integra-7-8-display-bad-otccdugj0mk41z1tpuysbqy4-5-0.jpg integra-7-8-display-bad-otccdugj0mk41z1tpuysbqy4-5-2.jpg

Jul 20, 2014 | Integra Dtr-7.8 Receiver

1 Answer

How much can you sell 2 of the following? I need to replace 2-100 ohm 2 watts resistors in my Kustom Profile_one unit. You recommended replacing with 2-130 ohm 2 watt metal oxide resistors. Currently one...

It sounds awfully like the resistors are close to breakdown voltage, I would Suggest that you do replace them with the resistors specified, because using anything else in a high voltage product is a fire risk, now who was it that suggested replacing them with higher ohm resistors? was it a service tech or was that right out of a manual or was if from the manufacturer themselves?
Anything to do with resistor replacement, as yo sound like you know, should be taken very carefully, because if you use the wrong resistors, you risk losing the components after the resister due to a higher voltage or sometimes even causing them to stop working due to a lack of current...
Be very careful and please go back to the manufacturer to get the exact resistors quoted from them and make sure you have it in writing from them so that if something fails you have at least done what you could.
Hope this helps, need any more advice, just ask!
***Please remember that advice on electrical appliances needs to be made by a licensed technician that had experience with that specific product otherwise you risk voiding the warranty or sometimes even risk your own life when concerning high voltage products***

Nov 23, 2010 | Audio & Video Receivers

1 Answer

Could you please tell me what the value of the resistor should be for the tuner section of rh750 tuner/amp (philips) thank you mark

Try an on-line search for "Phillips RH750 service manual". The only information I've found so far is a forum comment that it was made for a limited market (Australia?). If the fried resistor was in an amplifier, you could just look at the other channel for the matching part, but we must work with what we have.

One important peripheral item is to check the parts connected to the resistor for shorts. It could just be a slightly over-driven part finally succumbing to years of moderate overheating, or it might be a catastrophic failure due to another part breaking down inside.

If you can't find the service manual or schematic, you may have to reverse-engineer the circuit - trace it, map it out, measure the power supply voltage, then calculate what the resistor should be for proper biasing. If it was a carbon composition resistor, make sure you replace it with a low-inductance type - that can be critical for proper performance in a radio tuner.

If the resistor is part of a section using an integrated circuit, try to find the data sheet and application notes for the chip. A lot of designers just copied the suggested application circuits in these, so all you would have to is correlate the parts and possibly run through a couple of design equations.

You could also post on the forum linked above and ask whomever it is who owns one of these to take a look inside and tell you what the stripes are on his R142. He may want do it just to know whether his unit is headed for the same failure.

Nov 18, 2010 | Audio & Video Receivers

2 Answers

Marantz SR-18EX; Front left channel crackles

The f-l channel of the sr18, & sr18ex & sr19 is a common failure location due to the heating and cooling over the years. The crackling an/or distortion, is most commonly due to the amplifier going into a high idle, or d.c. offset that can no longer be controlled by the adjustment potentiometers on the board. usually the two 2sc3200 transistors become unstable, and as well a 47mfd and a 470 mfd elect. caps nearby. Also distortion is caused by one or more of the zener and germanium diodes all grouped near the big dual ceramic white resistor. The amp block is held in by six screws. first remove the cross bracket, then cut the cable tie free from the hole on the board. Ten screws hold the top board on, the pull the boards apart from the connectors. before replacing it, resolder ALL of the connector pins to BOTH boards.

Apr 20, 2009 | Marantz SR-18EX Receiver

2 Answers



friend of mind had the same model # and he give me the color band for the resistor

Nov 18, 2008 | Yamaha HTR-5560 Receiver

1 Answer

I baught an amplifier kit from maplin. its a 200w power amplifier. the problem is now when i turn it the two of the resistor gets hot and they are 5W 0.47ohm resistor. can you please help me with this...


Have you checked and set the bias current for the output stage. These 2 resistors will get hot if the bias is too high. Is it the firsy time you have fired the amp up? Operating in this condition may cause the output transistors to fail. If the output transistors are damaged,you would also experince heating of these resistors. Get back to me please and let me know if you have set bias


Nov 08, 2008 | Audio & Video Receivers

3 Answers

Marantz part for SR18
0.20 US each

Feb 02, 2008 | Marantz SR-18EX Receiver

4 Answers

Marantz SR 7200

It is likely that the PA stage has developed an offset voltage in the output stage. The faulty amplifier channel can be found by progressively disconnecting the collectors of the of the power transistors until the protection fault disappears. Once the faulty channel is found the the cause of the offset has to be traced to the faulty transistor or resistor. Don't forget that if you can smell smoke or burning then there are likely to be components(esp transistors) that have been damaged by the fault.
I had a Luxman unit that destroyed 5 transistors in the output stage that was due to an open .5W resistor in the driver stage.
Good luck.

Jan 29, 2007 | Marantz SR-7200 Receiver

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