Quad FM4 Tuner

Quad FM4 Tuner


The Quad FM4 Tuner is another classic British design from the then Huntington based Acoustical Manufacturing Co. Ltd. The Quad FM4 Tuner was first launched in 1982 at the same time as the Quad 405-2 and was the successor to the very popular Quad FM3 Tuner. When the Quad FM4 Tuner was first launched, there were many concerns that Quad had developed an all digital tuner. The actual truth was that although the display was digital, the Quad FM4 Tuner was very much analogue under the case.

The Quad FM4 Tuner did use a digital chip but this was only to control the display and store the preset frequencies. One gripe many listeners had the with the Quad FM4 Tuner was the small number of presets options available - seven in all. The Quad FM4 Tuner was very simple in design with just a tuning knob, power button, seven yellow preset buttons and a red tune button. The Quad FM4 Tuner was a very sleek design like all Quad's previous equipment but beautifully made with a sound quality that won may people over as just being totally natural.

The Quad FM4 Tuner was a very easy tuner to live with with AFC and muting done automatically - all the listener had to do was use the dial to tune in a radio station, check the strength signal was adequate and then sit back and enjoy the music. As with any quality tuner like the The Quad FM4 Tuner, it was essential a good quality roof mounted arial was used and plugged into the 75ohm coaxial aerial socket at the back.

The Quad FM4 Tuner was finally discontinued in 1995 although by that time more than 37,000 units had been sold and given the superb build and sound, the Quad FM4 Tuner still command a premium on auction sites like Ebay.

Quad FM4 tuner Specification
Frequency Range: 88-108 MHz
Sensitivity: 2.7µV (mono) / 25 µV (stereo)
Output level: 100mV (30% modulation)
Mains Voltage: 220-240 or 110-120 AC (switchable at the rear)
Dimensions (WxDxH): 321 x 207 x 64 (mm)
Weight: 3 kg

This entry was posted on Saturday December 30th, 2006 at 11:16 AM and is filed under Tuners. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response.

36 Responses to Quad FM4 Tuner

Roy parker Says:
September 4th, 2007 at 11:06 AM

A recommended unit. I've been using mine for 10 years and it has never let me down. Beautiful and a design classic.

Ton van es Says:
December 22nd, 2007 at 12:17 AM

When all the presets are occupied, I cannot tune manually. I was advised to start tuning from a preset position. The manual can't give the solution. What shall I do, need urgent advice.

Mark packer Says:
May 2nd, 2008 at 10:15 PM

FM4 manual tuning.

Push the 'Tune' button, it will take you back to the last point you reached when manual tuning; probably the last station you set as a preset. You can continue manual tuning from that point.


Rik Says:
July 2nd, 2008 at 8:38 AM

I have a Quad FM4 (brown), and the battery
seems not working very well anymore.
The instruction manual says the battery
will be recharged when the tuner is switched on.
As I haven't had it for a long time I might
not have had it switched on long enough.
But should it not work properly again,
could you tell me where I can find a new battery,
and how can I replace it?

John flynn Says:
July 23rd, 2008 at 4:08 PM

Rik, remove the cover and check that the battery is not leaking, If it is then remove it you will have to use a soldering iron, New batteries are available from Maplins, CPC ,Farnel,RS components.
Good luck

Mark Says:
August 24th, 2008 at 7:51 PM

i have a Quad FM 4 (brown).
I've just heard a pop and a slight burning smell from the rear of the tuner.
Everthing still works and sounds great.
Should I be worried? Do i need to change a fuse? Or?
Any help would be much appreciated.

Dave Says:
August 26th, 2008 at 7:53 AM

Hi to you all.I am thinking of getting a tuner to add in to my hi fi set.Tuners I had in mind are Naim Nato 5,Meridian 504,Audiolad 8000T n Quad FM4(most from E bay).Would any one commend regarding which will be the best chose in term of dimensional sound,good bass n pinpoint imaging.If so,why?.Thanks

Howard Says:
September 2nd, 2008 at 5:03 PM

I have an fm4 which has 2 x faults, First fault is that the output is extremely low requiring the pre-amp (34) to be turned up to about 19 to hear anything at all. Second fault is the tuner display, which, works ok from about 107 down to about 98, then shows the frequency increasing exponantionally even though in reality it is heading further down the scale to 88mhz.

Any thoughts????

Kate Says:
September 19th, 2008 at 9:37 AM

I inherited my father's Quad setup including an FM4 tuner, but the user's manuals have been lost. I've been using the CD player for some time but have only recently started using the system for radio reception. I can't get it to save the preset tuning positions. When I think I've done so after a lot of fiddling, I find the settings are lost again next time I switch on. Is it the internal battery which should save this information?

Kalle Says:
September 27th, 2008 at 8:53 PM

Hi! Probably the internal battery, i had the same problem. Change the battery or let the unit be on, it takes very little energy. It´s a wonderful tuner with very good sound.

Frank Says:
October 14th, 2008 at 10:16 AM


The FM4 manual is available for free download as a PDF from a few places on the web. Try http://www.hifi-forums.co.uk/messages.cfm?threadid=149FD28A-5070-B652-0483626FCA155C5D or http://www.hifiengine.com/manuals/quad/fm4.shtml for example. You might need to register, but in the years I've belonged, they've never been a cause of spam for me.

Dave Says:
April 14th, 2009 at 11:13 PM

I am interested in hearing what others have to say about the quad fm4 vs. Naim NAT01 and NAT05 as I am in the market for a good tuner.

Alex Says:
May 17th, 2009 at 5:01 PM

I put it in the warehouse for a couple of years, I turn it on, the display works but the memory buttons and the tuner led(red) don't work. I try to turn the dial button, the display stays at 87.50. I open the cover, the battery is leaking and the circuit board has a lot of black marks. Do you think the ic mp4480 is already damaged by the leaking. Thanks

Adrian Says:
May 23rd, 2009 at 10:16 PM

Alex, 17th May. Are any of the pins on mp4480 ic discoloured in any way? If not, then the chances are that the ic is ok. Clean off the circuit board only with cotton buds soaked with water and hope the print is not seriously damaged. Don't overdo this as you will cause short circuits on the board, then dry off the board thoroughly. If the print is damaged, repairs can be made, but because it is a radio as opposed to an amplifier, this has to be done carefully. You could pack it off to Quad in Huntingdon, Hunts and they will sort it.

This advice goes for everyone else with Quad gear. Quad should be paying me comission for all the work that I might be getting them and no, I don't work for them.

Alex Says:
May 27th, 2009 at 5:43 AM

Thanks Adrian, since I have two FM4, I swap the I old mp4480 and it is ok, I also clean the dirt with contact cleaner. It still can't solve the problem. I think it have to send it back to quad to fix it. Any way thank you for you help.

Alex Says:
May 27th, 2009 at 5:50 AM

Hi Adrian,
Thanks for your advice, I think quad can fix it.
Many thanks,

Mark a. urquhart-webb Says:
June 3rd, 2009 at 7:55 PM

Hi, I have an FM4 I bought for 30 quid in an auction at the factory where my mum worked. WhenI got it home, I found that it was 'Prototype 1' so valued it as a bit of history.
My mum worked on soldering Quad boards for 20 years and the quality was always very high - no flow soldering, neat hand-soldering and right-angled wire paths - it's a pleasure to look at the internals.
I switched it on recently but the buttons were not working so I suspect I need a new battery. Thanks for the tips!

Max Says:
June 10th, 2009 at 1:55 PM

Mark - I can better that! I used to work for Quad, & I also have a lab prototype FM4. On mine, the front panel is machined from solid aluminium, as it was the prototype for the diecastings used in production. It doesn't look obvious, but next to a diecast panel you can see the draw is less and some of the radii are sharper.

It still works fine, and gets used from time to time if there's anything left worth listening to on Radio 3!


John Says:
July 11th, 2009 at 4:26 PM

Have had an FM4 from around 1995.Excellent performance without problems until recently , when it suddenly went off.

The power loop through to the amp is working [ First thing I did was check the fuse in the back of the tuner ] but there doesnt seem to be any power getting into the tuner itself. No display appears.

If the power loop is still working , could it still be the PSU in the tuner ?
Took the lid off , no evidence / smell of a failed component.



Dave lees Says:
August 2nd, 2009 at 8:47 AM

Hi it is posible that the N1 suppressor has failed this puts a short accross the mains it is a 0.047uf with a 100 ohm resistor change this and replace the fuse (under the power socket) it may work . I have had 2 of these go on both mine and my brothers FM4

David smith Says:
August 21st, 2009 at 5:44 PM

I just started working on one of these where the battery had leaked badly. I've cleaned the board which just shows a little damage. Display works (stuck at 87.1) but buttons don't (similar to those described above). Also, the 12 volt regulator is running very hot. I suspect there is a short or heavy draw somewhere in the circuit.

Tune volts high and low are 8.0 and 1.8. does that sound about right?

Any info on the MP4480 chip and how to test?


Neil Says:
August 23rd, 2009 at 6:37 PM

My FM4 has blown the suppressor N1. Can you suggest where I might obtain a replacement in the UK? Both CPC and RS do not seem to have a 0.047uf/100R version.

Neil Says:
August 28th, 2009 at 9:46 AM

RadioSpares do have the 0.047uF/100R suppressor, and they are the original Rifa item. The RS code, for anyone else interested, is 206-7847. The item description is PMR209MB5470M100.

Lion (dutchman in spain) Says:
November 22nd, 2009 at 3:37 PM

My FM4 blew it´s second fuse in short time of use. I found the N1 in a bad state and the battery too. Then I found Neil´s remarks in this forum. I ordered the battery at Strikalite´s in the UK and the suppressor at RadioSpares here in Spain; I had to order 5 of them. Thanks for the hint, Neil.

Chi-si l㪠Says:
July 28th, 2010 at 9:57 PM

Bonjour, J'ai un FM4 acheté neuf il y a environ 20 ans. Il est très peu utilisé, peut-être 10 fois.
La semaine dernière, je l'ai mis en marche, toutes les lumières s'allument mais rien ne fonctionne. La mollette bouge, quelques graduations s'affichent, mais y a pas de son.Dois-je changer la batterie ou le fusible?

John Says:
February 26th, 2011 at 4:21 PM

I also have an FM4 which will not tune. I have removed the leaking battery. I am ordering a new battery. There are also signs of leakage around C11. Anyone know its value or, better, can email a circuit diagram or any other suggestions.

Alex brown Says:
May 28th, 2011 at 1:45 PM

I have the batteries available for £7.99 inclusive of postage, cheaper than most other suppliers.

Nigel Says:
July 17th, 2011 at 4:26 PM

I have an FM4 which was working perfectly yesterday but sadly now will not. When initially turned on two of the LED's light briefly and then the previously stored channel LED lights up. The display is permanently searching for a signal (the aerial is fine). Seems as though the AFC has gone. Switching to manual tune does not work either - continues searching.

Anyone with ideas?

Antonio ramos Says:
September 6th, 2011 at 4:40 PM

tune all stations but do not hear any som.Todos indicators work ok.

Gervais cote Says:
October 5th, 2011 at 11:34 PM

I'm looking for an analog fm tuner with best sound quality, no pre-select, no remote, only good music : is there something available like this on the market or should I keep my old Creek CAS 3040 tuner I bought in 1985 ?

Martin Says:
October 20th, 2011 at 5:54 PM

I would like an FM4 (brown/RCA) to go with my 34/306 setup, preferably one where the battery has not leaked. There are several on flea bay, but I would rather a straight sale.
There are two colours and two models, grey/brown and din/RCA connectors. If anyone has one on offer, email me on virgoprestige??yahoo.co.uk (retype the anti spam?? with @ okay?). Many thanks Martin (southern uk)

Richard Says:
May 10th, 2013 at 10:55 AM

I've just fired up my FM4 after a good few years of in operation. The battery had leaked and I've removed it and will replace but there was a bit of a mess on the circuit board which I've carefully cleaned up.
The tuner works fine except that the signal strength meter stays static at one segment on both channels.Could I have upset something on the board which has caused this fault and is there a simple repair?
Any thoughts.

Ray charles Says:
July 13th, 2014 at 9:16 PM

Done the Quad FM memory chip mod.
Components out and new chip in.
The resulting outcome being a disaster.
Station freq. jumping all over the place.
No latching on with the pre-sets.
Anyone with suitable info for me ?

Any thoughts welcome.


Jan z Says:
May 10th, 2015 at 12:22 AM

I bought my FM4 about 4 years ago, mint, boxed with all manuals and accessories on Ebay for £50 - but not working correctly - tuning scale erratic and memory not working, then popping and no sound. I decided it had to be salvaged! The battery had leaked over the circuit board as had some of the electrolytic capacitors. Checking the circuit diagram supplied, I bought a new battery and set of capacitors to replace all but those in the PSU - Quad service had done those. The job was a joy to do for an occasional solder dabbler and my FM4 works beautifully. It gets used daily and I love it!
My advice to anyone that has a failing FM4 - check the sources on the web and go at repairing it. Very satisfying!

Shark Says:
December 21st, 2015 at 5:10 PM

I own an FM4 and it has not let me down till recently (actually earlier today). I hooked it up after several weeks not using. It's dead. I checked the fuse but I don't seem to be able to power up the unit. Any thougts anyone. Appreciate your feedback.

Bernard harris Says:
September 18th, 2016 at 12:28 AM

I purchased a late grey Quad FM 4 Tuner, with only 7 presets on it. Worked perfectly, except I didn't like the nic-cad built in battery, because these batteries are very proned to leaking, and burning out the printed circuit board. There has been a 14-station preset internal module introduced by Quad in 2011 for these tuners. I was recommended to send my tuner to Amplabs of Worcester for servicing, as their reputation for servicing Quad equipment, is exemplary. They serviced my Quad FM4 tuner, changing old capacitors, checking other components, and installing the 14 station module, doing away with the internal nic-cad battery, altogether. Partnered with my late grey Quad 44 / Quad 405 II equipment, the tuner 'sang' like new. They also serviced my Quad44/405-2 to perfection, upgrading all old capacitors and other components. Sounds all so good now. I recommend Amplabs for servicing your Quad equipment, unreservedly.

Leave a Reply


Subscribe to RSS feed