Its not a normal condition, if you have differences in the temp on the cooling elements, there is something wrong in one channel, probaly the hot one, it may help to change caps, but if you start changing electrolytic caps, change all of them, if not bad now they will be in near future,

Check your supply, amp and endstage voltages. There is a good BM 4400 manual on site (for silver members)

Welcome to the forum, I'm sure one of our members, who knows more than me about BM 4400 will answer shortly.

You may also have an issue with the trimmers that regulae the voltage. In order to really perform a proper refurb you will need the service manual. All the instructions for electrical and mechanical adjustments can be found there.

BTW - You have one of the best sets B&O ever made. get a pair of S-75 or M-75 to round it out.

Kevin, welcome to Beoworld !
Thanks for signing up as a silver member, your support is greatly appreciated.

Your Beomaster will need a new idle current trimmer in the warm channel (red circle in the photo below).
It's a fairly cheap repair and the repairer should do both channels while in there.
The trimmers will need adjusting to factory specs as per the service manual after replacing.

If you have an electronic type soldering iron, a multimeter with a millivolt range and basic
electronic skills, you can do the repair yourself. The trimmers are 100 Ohms and standard
components, found in any electronic parts store.
It would also make sense to replace the capacitors, as Søren suggested. I can supply a capacitor kit
and I can also supply the trimmers but you may also be able to find the things locally.

The Beomaster 4400 is a wonderful receiver, easily worth repairing, I would recommend you
don't use it before repairs have been done.

Login to view image

Martin

Thank you all for the warm welcome and the great advice. I'll take the 4400 off line until I can get it sorted.

This is my first B&O receiver/amplifier, but I've been a B&O turntable owner since 1983 when I bought my first 4002.  I had that unit for many years until I sold it a year or so ago.  During that time it has served me faithfully and remained largely trouble-free.  When I sold it I immediately had sellers remorse.

The 4004 I recently acquired with the 4400 was in cosmetically fine condition, but needed a fair amount of work to get it back up and running properly.  I replaced the sensor arm micro bulb, the speed dial bulbs, fine tuned the sensor diaphragm, replaced the belts, lubed and adjusted the cueing mechanism.  Now it functions 100% like new, and I couldn't be more pleased.

Thanks again!   Kevin

Keiko5 wrote:

Thank you all for the warm welcome and the great advice. I'll take the 4400 off line until I can get it sorted.

This is my first B&O receiver/amplifier, but I've been a B&O turntable owner since 1983 when I bought my first 4002.  I had that unit for many years until I sold it a year or so ago.  During that time it has served me faithfully and remained largely trouble-free.  When I sold it I immediately had sellers remorse.

The 4004 I recently acquired with the 4400 was in cosmetically fine condition, but needed a fair amount of work to get it back up and running properly.  I replaced the sensor arm micro bulb, the speed dial bulbs, fine tuned the sensor diaphragm, replaced the belts, lubed and adjusted the cueing mechanism.  Now it functions 100% like new, and I couldn't be more pleased.

Thanks again!   Kevin

 

Kevin:

Welcome to Beoworld.  Now upgrade yourself to gold membership so you're eligible for the monthly prize drawing!  😁

Now, regarding this 4004 refurb you did:  Pictures, or it didn't happen!

Rich

PS  All tongue in cheek of course....

Rich wrote:

Kevin:

Welcome to Beoworld.  Now upgrade yourself to gold membership so you're eligible for the monthly prize drawing!  😁

Now, regarding this 4004 refurb you did:  Pictures, or it didn't happen!

Rich

PS  All tongue in cheek of course....

Here they are!  After receiving the advice from Dillen, I rotated the idle current trimmer clockwise a touch, from about 10 o'clock to 11 o'clock and it cooled off immediately!  I still want to replace some of the caps and the trimmer, but it is running fine now.  The BG 4004 is everything my 4002 was, but its in better condition.  You may notice that I applied clear screen saver film over the touch pads to save them from wear.  I couldn't be happier with the recent additions to our household!

Kevin

Beautiful pics, I want a BM 4400, and I'm jalues, and no more pics please😭, but change your caps and your trimmers, and enjoy for the next 20 years

Another question to BM 4400/4001 owners:  In some of the online images of the BM 4400, I notice that the FM signal strength meter is illuminated.  The meter on my unit doesn't light up.  I can't find a reference to a lamp in the 4400 schematics, and I can't see one when the unit is opened.  If there is one I'm guessing it is buried in the meter assembly.  Both my tuning arrows light up as does the stereo indicator lamp.  Should I also be getting light from the signal strength meter?  If so, how do I gain access to the lamp?  Thanks for any guidance.

Kevin

It's in the schematics, designated 0IL1 (Radicator).
It's possible that something has been changed in your Beomaster but
normally, the ON and signal level meter lamps are in series, meaning that
if one goes out, the other goes too.
So either the signal meter lamp is actually lit (only not bright enough to see in daylight)
or the lamp has blown and been bypassed
or the associated zenerdiode (D1) has shorted.

Two different types of lamps are used;
One is a wedge type (like the others), sitting in a plug-in socket at the side of the meter,
the other is an axial type sitting built into the meter and a bit harded to access.

Martin