peter
Tinkerer
Retired, collector of vintage radios and test equipment for restoration and repair.
Posts: 97
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Post by peter on Sept 17, 2021 23:28:23 GMT 12
I've moved on from the radio to fixing my heathkit IG 18 sig gen (amplitude pulsing up and down) - narrowed it down to the regulator transistor in the power supply. Found suitable replacements on line 2N3439 AND the price of $15.00 postage to send them within NZ. I kid you NOT - extortionating so and so's!!
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peter
Tinkerer
Retired, collector of vintage radios and test equipment for restoration and repair.
Posts: 97
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Post by peter on Sept 17, 2021 23:30:05 GMT 12
Check the continuity of the output transformer primary. A tell-tale sign of an open circuit primary is the screen grid of the output tube glowing red hot. Thanks for the suggestion but there is very faint output and no problems with the output transformer - probably a tube giving up the ghost.
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Post by harryorgans on Sept 18, 2021 11:13:11 GMT 12
I've moved on from the radio to fixing my heathkit IG 18 sig gen (amplitude pulsing up and down) - narrowed it down to the regulator transistor in the power supply. Found suitable replacements on line 2N3439 AND the price of $15.00 postage to send them within NZ. I kid you NOT - extortionating so and so's!! Did you try element14? they have a few options and in my experience their shipping is fast and reasonable. Not everyone is these days - I bought a $45 tool last week and had to pay $15 extra to have it shipped from Christchurch to Masterton!
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Post by Radiotech on Sept 19, 2021 2:39:42 GMT 12
I've moved on from the radio to fixing my heathkit IG 18 sig gen (amplitude pulsing up and down) - narrowed it down to the regulator transistor in the power supply. Found suitable replacements on line 2N3439 AND the price of $15.00 postage to send them within NZ. I kid you NOT - extortionating so and so's!! I just had a look at the circuit diagram for the IG-18. The power supply series regulator transistor is nothing special. You can replace it with a TIP41C from your local Jaycar store, part # ZC2291 - cost = $2.90.
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peter
Tinkerer
Retired, collector of vintage radios and test equipment for restoration and repair.
Posts: 97
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Post by peter on Sept 19, 2021 3:39:53 GMT 12
I've moved on from the radio to fixing my heathkit IG 18 sig gen (amplitude pulsing up and down) - narrowed it down to the regulator transistor in the power supply. Found suitable replacements on line 2N3439 AND the price of $15.00 postage to send them within NZ. I kid you NOT - extortionating so and so's!! Did you try element14? they have a few options and in my experience their shipping is fast and reasonable. Not everyone is these days - I bought a $45 tool last week and had to pay $15 extra to have it shipped from Christchurch to Masterton! Yep they were the one who wanted $15 to ship 5 transistors to me!! No way!
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peter
Tinkerer
Retired, collector of vintage radios and test equipment for restoration and repair.
Posts: 97
|
Post by peter on Sept 19, 2021 3:42:16 GMT 12
I've moved on from the radio to fixing my heathkit IG 18 sig gen (amplitude pulsing up and down) - narrowed it down to the regulator transistor in the power supply. Found suitable replacements on line 2N3439 AND the price of $15.00 postage to send them within NZ. I kid you NOT - extortionating so and so's!! I just had a look at the circuit diagram for the IG-18. The power supply series regulator transistor is nothing special. You can replace it with a TIP41C from your local Jaycar store, part # ZC2291 - cost = $2.90.
Thanks for that - I just took what a youtube person said without looking up the specs myself as he did it (checked specs) and showed the replacement in the video.
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Steve
Society Members
vintageradio.co.nz
Posts: 732
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Post by Steve on Sept 19, 2021 9:31:25 GMT 12
** OFF-TOPIC ** IMAGE ROTATION SOLUTION **
Hi John - JPG photo files contain image and colour information, and stuff called EXIF data. EXIF (Exchangeable Image File Format) contains all kinds of info, like the date of the photo, GPS data if you have that functionality in the camera, size, zoom, quality, and - as you've found, rotation. This is because camera phones can take photos any way up - but you want them to display the way they were taken - so the camera records the orientation of the phone at the time the photo was taken, then applies that rotation any time you view that photo (the photo display software in your phone is, therefor, said to be 'EXIF-aware').
There are a couple of ways I can recommend to fix this before uploading images here, and its a problem only because the software behind these forums does not seem to be EXIF-aware.
The complex way (unless you are used to real photo editing software) is to open the image (I use GIMP photo editor so these instructions are for that, but Photoslop is probably similar- I refuse to use it any more due to their monthly ransom demands) and follow these steps: 1. When it says there is rotation data, what do you want to do - say "Keep original rotation" - the photo will open in whatever orientation your camera actually was in when you snapped it. 2. Choose IMAGE - TRANSFORM - ROTATE (left, right or 180 degrees, whatever it needs) which will properly align the photo. 3. At this point you can do other fixes: - IMAGE - SCALE IMAGE to resize (1024 wide might be a good option for uploads here - not too big, not too small) - COLOR - LEVELS - AUTO INPUT LEVELS to auto-fix washed out images (doesn't always work, click CANCEL if it doesn't, or manually manipulate it) 4. Then FILE - SAVE AS, and for JPG images one of the options that will come up is to untick "Keep EXIF data" - which contains (among many other things) the rotation information. Untick this. 5. If I care about the original, often I will just put "_sm" at the end of the existing filename to indicate to me that its a modified copy of the original - so IMG1029.jpg would become IMG1029_sm.jpg - this way you don't over-write the original with its higher detail.
The simpler option works if you still have the trusty old Windows Photo Viewer (not installed by default in new Windows 10 installs, but its still there, hidden, from memory - and can be reactivated - Google it) Open the photo in that, and because it is EXIF aware and will display the photo in the same (expected) orientation as your phone or camera did - but if you then rotate it with one of the rotate buttons and close it then the EXIF rotate data will get overwritten. Open it again, rotate it back where it should be (assuming its not now in the correct orientation), and close it again, it will now be in the original expected orientation again, but the rotate data is gone.
There are many ways to do this in reality - those two are the ones I use - mainly GIMP because I'm always dealing with images I need to fix for the site. GIMP is great and does much of what Photoshop does, but its open source software (free to use). It has its quirks, and I've got my differences with the developers but overall its a solid tool. I'm actually doing a video tutorial of how to do some basic stuff in GIMP at the moment as part of a dial reproduction video - I might slip something about the EXIF info into it.
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Post by Radiotech on Sept 29, 2021 10:13:15 GMT 12
I just had a look at the circuit diagram for the IG-18. The power supply series regulator transistor is nothing special. You can replace it with a TIP41C from your local Jaycar store, part # ZC2291 - cost = $2.90.
Thanks for that - I just took what a youtube person said without looking up the specs myself as he did it (checked specs) and showed the replacement in the video. Ok. The Youtube person was probably overseas, and they have all sorts of weird and obscure parts available that we never really saw here. I repair equipment on a daily basis and subbing out transistors and other parts is a necessary routine when one lives on a small island at the bottom of the world.
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