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#1066
11-08-2022, 07:52 AM
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Sorry....
When doing this, it may be smart to put a 1K or so resistor in series with pin 2 or 3...... disconnect pins 2, & 3 of L4. Take your tuner subber and ground pin 2 of L4, and using your coupling cap attache the tuner subber to pin 3 and see if a signal makes it to the screen..... Without a plate voltage there I'm not sure if it matters to leave V1 in for this part, or take it out. ..
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Yes you can call me "Squirrel boy" 
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#1068
11-08-2022, 11:47 AM
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Mica caps tend to be more stable than ceramic disc, and since you have already crossed the threshold of no return and removed the caps in L4, might as well put 2 new mica .001 caps in. provided they are up to the voltage rating.
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#1070
11-08-2022, 01:00 PM
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Taking them in and out like that would have upset any alignment there may have been in the coil, if size was a problem, rather than putting the old ones back, new ones like this may have been better.
https://www.mouser.com/ProductDetail...mqNqg61Q%3D%3D
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#1072
11-08-2022, 01:26 PM
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That clear pic form several posts ago from v2 pin 2 I can’t get back since I changed the 22 ohm resistors which were around 28 ohms. This is what I get wire off L3 v1 pins 2 and 7 and v2 2 and 7. Agc didn’t do anythin
Last edited by timmy; 04-24-2023 at 04:16 PM.
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#1073
11-08-2022, 01:34 PM
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Quote:
the old ones were Z5U, had a pretty big spike. https://www.allaboutcircuits.com/upl...captypes_1.JPG i guess the red one was on pin 1 and the yellow RMC on pin 2? RMC= higher voltage.
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#1075
11-08-2022, 01:56 PM
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Quote:
Pin 4 of K1 ( test point C / C18) is the ground ref point for that circuit, if removed, it would cause a drastic rise at all other points including the grid of V1.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#1076
11-08-2022, 02:11 PM
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Quote:
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#1078
11-08-2022, 02:38 PM
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More likely than not, the first few stages are out of tune, be it from age, or from someone messing with it, for some reason or another, it can't pass a signal, and nothing short of someone with an alignment setup can get it back to working the way it should again.
You could try the steps that Squirrel boy mentioned, like on the top of this page, unhooking the primary of L4 to feed in the subber direct, this can help find what is out of tune, however, trying to tune without the right equipment is pretty much impossible, and you pretty much end up making it worse if you try. At this point you have pretty much confirmed that you do indeed have an IF problem, and the best way forward is to rig for direct A/V input until you can find someone with the correct equipment and knowledge near you to align it, the chances of there being a fault in the IF is low, but there may be, but when alignment is attempted with the right equipment, any faults will be quickly found.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#1079
11-08-2022, 02:43 PM
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Or if I mark the trap and rotate it left and right and see if I get anything because at this point I’m looking at either the 3 coils before v1 or the trap and if none of this gets any results then possibly the 39pf 800pf 56pf 150pf caps.
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Linear Mode
