[Amps] Basic Question Finding Passive Component Up in Smoke

[john starr001]

I shorted it right at the B+ and the supply caps, bleeders, etc are not near the point of the smoke puff which was around the tube sockets.  I guess I should power it up, use a lighbulb current limiter and see what happens? tnx john
 > Date: Tue, 9 Apr 2013 21:03:46 -0700
> From: k2vco.vic at gmail.com
> To: amps at contesting.com
> Subject: Re: [Amps] Basic Question Finding Passive Component Up in Smoke
> 
> Well, if you grounded the B+ on the plate side of the RF choke, you could have heated the 
> choke enough to make smoke without burning it out. It would probably be discolored in that 
> case.
> 
> Where did you ground the B+ and what was between that point and the power supply?
> 
> On 4/9/2013 8:41 PM, john starr001 wrote:
> > I am a beginner learning amplifier basics and decided to build a simple 6146 class C final CW rig with a 6CL6 driven crystal oscillator much like the Eico 720 or Globe Scout.  The power supply is a full bridge 600v B+ and 300v non-regulated screen supply.  I did something stupid and accidentally grounded the B+ supply.  So I blew the 3A AC line fuse but just before one of the components in the 6CL6 or 6146 circuitry went up in a cloud of smoke. I have visualized every cap, resistor and inductor and find no damage.  I have measured every resistor, directly or indirectly, in-circuit and all are to spec.  No open inductors and no shorted ceramic caps (all in -circuit).  I tested the power supply disconnected from the RF circuit and the supply, without load seems fine.  The 6146 and 6CL6 test fine as well.  I want to put it all back together again and test the voltages with the 6146 and 6CL6 removed but I am a chicken worrying about blowing up something else (like my transfomer
>   t
> >   he next time).   There was a obvious puff of smoke so something was lost.  I figure approaching this kind of problem must be routine for you guys working on amps so would appreciate learning what would be your next steps to find the bad part while minimizing further damage.  I thought the 6146 screen would burn up if the plate B+ were suddenly lost but it tests fine on my Hickock. tnx and 73john 		 	   		
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> -- 
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
> 
> 
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