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#1111
11-11-2022, 11:26 AM
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Quote:
no video is not "normal operating conditions", so until there is normal operation of the RF-IF to video input, and the AGC feedback loop is normal, the .4v will always be abnormal. The sound det is taken from the plate 3rd If, via C43, if V7 is not in the right state, it can clamp down on it.
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#1112
11-11-2022, 11:31 AM
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Quote:
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#1113
11-11-2022, 11:42 AM
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As electronic m had said if you have sound the video is with it so I guess what I’m saying is that could there be something in the sound that could knock out the video at the 3rd IF because test point b says all is ok from there but before that is v3 and sound.
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#1114
11-11-2022, 11:55 AM
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It all has to do with response curves, it's all a delicate balance that has to factor in many things, including temperature, resistors, capacitors, coils, even tubes fit into this, which is why one never tries to align with old tubes, always new ones, and it's a long exhausting process, you change one thing one one end, it will change something on the other, so you keep going around and around, over and over until you get it as best as you can.
IF alignment is very frustrating.
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#1115
11-12-2022, 08:26 AM
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And, as already said, the alignment shape changes with AGC (and hence signal) level.
It behooves us now, who use modulators and coax, to align so that its spot on at the signal level we expect to actually have. I disagree that its always hard. Its hard for sets that don't have shielded coils and really good bypassing, like the Pilot 3" sets and the Hallicrafters 7" electrostatics, both of which seem to oscillate if I follow instructions. Also as I've said before: I've seen exactly two tube TVs that got to me with even mildly passable alignment: A TT5 and a TRK12.
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#1117
11-14-2022, 01:42 PM
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I have to wonder if there are chassis that are really sensitive to tubes particularly in the IF now I have a zenith in v1 and a sylvania in v2 I have 5 lindal 6eh7 tubes only one of which I had tried but found that the zenith actually gave more then the lindal so I’m not sure if I may have all lousy tubes wish I could rule it out and not just believe the tube tester. I know lindal tubes they say are not good but I didn’t try the other 4 of them either.
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#1118
11-14-2022, 02:01 PM
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Are the all NOS tubes?
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#1121
11-14-2022, 02:58 PM
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The reason why I ask is I tried the rf cable from the tv tuner and tried it on v2 and I was surprised that there was a picture present with not much contrast but it was very stable no vertical or horizontal issues so I’m looking into dirty tube socket or pin’s.
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#1123
11-15-2022, 10:24 AM
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Take a look at the voltages in the general area that it's hooked to in the schematic, add 100v, as a general rule.
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#1125
11-15-2022, 11:24 AM
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As long as it can still fit in the same space the old one came from, and the farad rating is the same as the old, larger voltage really can't hurt.
__________________
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