[Hallicrafters] Re Off Topic Repair Assistance Needed

[Duane Fischer, W8DBF]

Is there anyone in MI who could help me with repairs on a H. Scott LK-72b stereo
amplifier? It was completely gone through, electrolytics replaced and so forth.
Burned in for five days, no problems.	
	
Tubes were shipped separate from the amplifier. Everything was well packed.	
	
When I powered it on, I heard a mild hum from the right rear. Now I was kneeling
over this amp which was sitting on a wooden stool in my living room. No case on
it. The hum was not from a speaker, at least I don't think it was. Things
happened pretty fast. Within two seconds of power up, I heard a sharp pop, heard
a sizzling sound and instantly killd the power. My left hand was still on the
power switch at the time. Volume, also controlled by this knob, was at one
quarter. 	
	
I smelled smoke. 	
	
I immediately disconnected everything and took it outside, just in case. But
nothing else happened.	
	
There are three vertically mounted resistors in line with the rectifier tube.
The one farthest left beside the rectifier tube exploded, literally. Blew the
left side right off. No other signs of any damage. I have not removed the bottom
chassis cover and checked inside, however. 	
	
I wonder if the rectifier tube was damaged from normal transit vibration and
developed a plate to filament short? Because there was power for less than three
seconds, nothing had time to warm up and B+ was not yet present. 	
	
But what was the hum from? The large power transformer because of the dead short
in the rectifier tube? No, the fuse did not blow, by the way. 	
	
If anyone in the Genesee County, or adjoining counties, area with experience can
assist me, I would greatly appreciate it. Thanks.	
	
Duane Fischer, W8DBF	
dfischer at usol.com