[TV MAN]

After the transformer repair, here's what happened next.

   

Full horizontal! Yay! Here's what things looked like after some adjustments.

   

Then again in about 5 minutes. Getting dim and bloomed like in the 1st power ups. Gets worse when I raise the line voltage. A check of the HV revealed a solid 5kv when 1st powered up, then gradually dropping down to about 3500v. I'll check into that later. Probably that HV filter cap in the cage that I haven't gotten to yet. Have to pull the big tube to get the screws out. May clip it and see if that is the culprit.

   


Next, I fired up the B&K 1077 and injected a signal in the antenna. I found the tuner IS passing the signal, although pretty weak. Washed out video, no horizontal hold (vertical seems solid), contrast control has no effect. Next I injected a signal into the 1st IF stage.

***NOTE - VERY IMPORTANT: Mr Anderson mentions in his video that since this is a live b- chassis, you must use an isolation transformer to prevent damaging test equipment or worse. I noted that, but what I DIDN'T think about was how I was powering the chassis for testing. I ran the filament circuit off the power line through a 150w dim bulb for protection, mainly in case I shorted something I wouldn't chance burning up something or worse, blowing the 7JP4 heater! I have been powering the B+ from a variac through an isolation transformer. I can control the voltage and monitor the current easily. So, I connected the B&K and flipped the switch. FULL brightness on the dim bulb! A dead short! Then I realized what I'd done, and the dim bulb did its job, saving my test equipment, picture tube and alerting me that something was wrong! You can never be too careful, and even seasoned guys like me can make mistakes. Please learn from my mistake.

That said, the results of this test were the same. Weak, washed out picture, retrace lines, no H hold. I injected video into the 1 video amp, better but still no H sync, finally the video output grid. The result is below. The video looks solid, NO H sync whatsoever. On the good, vertical sync is solid, and I get sound (with hum) at the tuner and video IF.

     

Alright, is the problem in the video amp? I have sync issues too. So, time for some voltage checks. Plate of the video out? Perfect. Full 85v. Grid? Fine to a little high. Screen grid? Ah ha! Should've been 120v, I had about 80v. Checking the 1st video amp, plate was low too. I knew my B+ was at a full 130v, yet on the other side of that 1K resistor was only 80v. I also noted that while not smoking, I could see wet looking wax. Do you see the culprit in the schematic below? Uh huh. C2, 40uf. Probably leaky. I also noted that the same B+ line off that cap also feeds the horizontal oscillator, which is very likely wrecking my H sync. Anyhow, I spent the next evening studying replacement of that can. Not gonna happen (without a bunch of work)! That baby is buried! But I did find I can clip the pins off and relocate the replacements in a nice open part of the chassis, and down in the power supply area. I'll jump back later in with the results. But I bet that wakes up my video and hopefully the H sync.