I have aquired a beomaster 1001 made in 1973.

 After about an hours use it tends to get very hot on the rear underside of the unit.

 Is this normal for an old amplifier or shoud i take action.

Steve.

 .

Steve,

The Beomaster 1001 (and 1200) uses the bottom chassis plate as a heatsink.
If it gets warm within 5-10 minutes you need to get the amplifiers idle current checked, in this case the heat buildup will be more or less
concentrated around a pair of the transistors mounted underneath, at least to begin with.

Normally, after one hour of playing with good listening volume, the whole bottom plate will be "pleasantly" warm ie. not more than handwarm and not particularly concentrated. If it gets "very hot" as you describe, you should have it checked. Should be a cheap repair in that the symptoms are well-known, the components are cheap and fairly easy to reach.

Martin

My farther once owned the 1001 model and had the same problen you discribed. the intense heat even came though to the top panel. However mine tends to only get extreamly hot at the rear botton right hand side of the unit.

The main underside and and vents holes at the front side are not effected but are only slighly warm to the hand after an hours use.

Taking into account what you told me is it also posible that the power transformer could be responsible for this hot spot and the heat simply a direct result of the underside being made of metal? or should i still get the unit looked at?

Steve

The mains transformer is of an older type that consumes quite a bit of power itself so it will get hot. Furthermore it's shielded in a metal housing that will, at least to some extent, place an electromagnetic load on it so it will get a bit warm even if running alone. In your case I wouldn't worry.

Martin

Ok Thanks very much.

That's very helpful. Cheers.

Steve.