Help! Is my tuner overheating?!

Radio Road

Which tuner to get and getting the most from it. Thank God, for the radio!

Hello,
Few months ago I got a mint Kenwood KT-917 from eBay.
When it arrived, I hooked it to my amp and turned it on - everything worked flawlessly except for the DDL LED not being lit when a station is tuned.
Since I didn't have a rack that it could accommodate it, I didn't immediately start to use it.
Few days ago, I finally had time to build the rack.
I put the KT-917 in it and I started to listen to some music.
After some time I noticed that the tuner started to be quite warm.
After some three hours the top of its metal case got almost burning hot - when I had a palm of my hand on it, it didn't feel comfortable at all!
I had a sensation of almost being burned.
Even the tips of rotary controls were warm, as was the front glass...
Here is the pic of KT-917's initial placement in my rack:

.
.
I figured out that ventilation might not be sufficient, so I increased the space above the tuner like this:
The situation got much better - after few hours the tuner's top surface got quite warm, but not unpleasantly hot.
When I tried it in the open, out of the rack, after few hours it was only lukewarm.
So far I only had slim digital tuners and this is my first monster analog one, so I don't know if this is normal.
It has all this lamps inside and a huge transformer and capacitors that could find a place in some amplifier.
If this is normal, how these things were supposed to be used?
In what kind of rack?
If it should get so warm, why doesn't it have some ventilation holes on the top of its case?
The heat build up is so excessive even in my rack that has all four sides completely open. Shelves are connected only by three threaded iron rods.
Or maybe some aged components inside are over heating?!?
On the other side, the sound that this tuner puts out is awesome, that it is hard to believe that there is something seriously wrong with it.
Thanks in advance,
Aleksandar

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Topic - Help! Is my tuner overheating?! - Kuja 05:44:42 09/30/06 (5)

Re: Help! Is my tuner overheating?! - Kuja 16:50:16 10/01/06 (1)

Re: Help! Is my tuner overheating?! - George Mann 20:32:05 10/01/06 (0)

My rule of thumb for tube equipment is minimum of... - theaudiohiffle 19:22:39 09/30/06 (1)

SS tuner, maaate! - Timbo in Oz 20:16:47 09/30/06 (0)

If it has never been serviced? get it done, - Timbo in Oz 17:20:35 09/30/06 (0)

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