#31
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Yes, I replaced those micas and the one coming from the tuner.
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#32
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Might be a good attack to take a spare 1500 pf and bridge the replaced ones one at a time. (?)
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#33
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The micas in the IF stages are all 270pf. Are you saying to bridge each one with a 1500pf one?
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#34
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Sorry, I meant the 1500 pf bypass caps that are everywhere. Did you replace any of them? If not, that is even more reason to look for trouble with one of them.
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#35
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Quote:
Thanks. |
Audiokarma |
#36
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OK, I jumpered each 1500pf bypass cap with some clip leads attached to a 1500pf mica cap. It wasn't as hard as I thought it would be. Still no joy. I'm suspecting the tuner.
Anymore ideas I could try? |
#37
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Even though the IF tubes test ok, I would try swapping them out to see if the symptoms change.
jr |
#38
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Quote:
I take it you found no hot spots that changed the behavior when touched. How does the picture react as you turn the Picture control up and down? Do the streaks move? Or is there only a contrast change? |
#39
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Another question: what do you get if you disconnect the input signal? Can you get snow without streaking?
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#40
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OK, I swapped out each one, one at a time with another NIB RCA 6AG5 that tested like new. Still no joy. Basically the same with each swap out. Good idea though.
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Audiokarma |
#41
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When I disconnect the mica capacitor going to the 1st stage IF, the streaking goes away, but I also don't just get snow. I get some lines that I go away with the H. adjustment on the back. But never get any snow. When hooked back up, the streaking is there with the picture.
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#42
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I think he meant test pattern gen to tuner not tuner to IF...
If you have a B&K analyst or another set that uses the same IF freq, you could inject a signal into the IF and check it's function.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#43
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OK. I'm uploading a video of what I have and what happens. It'll be ready shortly. I appreciate everyone's help.
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#44
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#45
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I didn't understand what it was you disconnected in that video. I did intend for you to disconnect the antenna input, not the IF.
Anyway, I think the next thing I would try (after disconnecting and reconnecting the antenna) is removing/swapping the RF amplifier (V1). |
Audiokarma |
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