[Heathkit] Troubleshooting HW-99

[W5VPU@aol.com]

Hello, Everyone.
I have an HW-99, a 50 watt "novice" cw (80, 40, 21, 10) transceiver which has 
gone dead on me. I asking for information. I bought this at a flea market six 
years ago and used it to get back into ham radio after an absence of 18 
years. Worked ok for several years, but then got RST reports of a hum/rasp on 
transmit. I replaced the power supply filter caps. Used it a short while; 
receiver worked ok, but it blew the house current fuse on transmit and entire 
radio went dead. I checked the caps I replaced, and they appear to be ok and 
not shorted. Still shows 12 and 30 volt power at appropriate spots, but no 
receive or transmit. 
I have considered the following actions: (1) Following the manual's small 
troubleshooting guide in sequence; (2) checking each point receiving voltage 
as shown on the schematic (I am unsure about checking transmitting voltages 
until I can get receive working). After that I would then have to wonder if I 
blew the final, or ?????
I became inactive when we used tubes, and to get myself acquainted with 
current solid-state design and practice, I built a Ten Tec Model 1253 
regenerative receiver about three years ago. I have installed some boards 
into a couple of transceivers I recently bought. I'm not intimidated by 
radios, but most of my building/repair experience was in the 1940s through 
the 1970's on tube radios.
Anyone have anything happen similar to my experience with the HW-99?
Anyone suggestions for troubleshooting sequence or details, and repair (other 
than just selling it for parts)? I'd like to get it going again, for my own 
sense of accomplishment if for no other reason. 
 Thanks a bunch.
Raymond, W5VPU

    
    



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