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Modifications: Heathkit IG-18 Audio Generator
http://tronola.com/html/ig-18_mods.html
To summarize the versions, we have: IG-18 - Heathkit's original audio generator based on discrete transistors and stabilizer bulb. IG-18SL - Tronola adaptation of IG-18 using the HP-339A oscillator circuit. IG-339A - Dick Moore's version of IG …
The Heathkit IG-18 Sine-Square Audio Generator - YouTube
https://www.youtube.com/watch?v=TJ9yz0Qh_uU
In this video, we'll take a look at a piece of vintage Heathkit testequipment, the IG-18 Sine-Square Audio Generator. I'll discuss thehistory and features of...
www.heathkit.nu
http://www.heathkit.nu/heathkit_nu_IG-18.html
www.heathkit.nu. The Sine/Square Wave Audio Generator IG-18 came on the market in 1969 and was produced until 1975. The assembled version IGW-18 was replaced by the SG-18A in the early 70's. They were replaced by the IG-5218 in 1977 and was produced until 1990.
Heathkit IG-18 THD Modification Manual
http://www.d8apro.com/IGA-18-1.pdf
Heathkit IG-18 THD Modification Manual ... generator. We have left out the changes that are controversial and/or require major ‘hacks’ to the PC board. We are of the opinion that any modification must have a major impact to the kit, ... Connect the IG-18 to an Audio AC Meter (If an AC Voltmeter is not available, simply read the output on ...
THD Improvement kit for IG-18 series audio generator …
https://shop.heathkit.com/shop/product/thd-improvement-kit-for-ig-18-series-audio-generator-test-equipment-complete-kit-iga-18-1-17?category=26
We evaluated the designs, and Heathkit now offers a complete new kit incorporating the best electronics to help you get the best possible performance from your Heathkit IG-18. Highly compatible. This upgrade can be performed on the IG-5218, SG-18, and the SG-5218. Confirm your desired kit format. Our upgrade kit is available in two formats:
THD Improvement kit for IG-18 series audio generator …
https://shop.heathkit.com/shop/product/thd-improvement-kit-for-ig-18-series-audio-generator-test-equipment-meter-buffer-board-only-iga-18-2-4
THD Improvement kit for IG-18 series audio generator test equipment (meter buffer board ONLY) - IGA-18-2 ... Lots of articles have suggested improvents to the Heathkit IG-18. But until now, no one offered a complete kit to make these modifications easy for the DIY'er. We have incorporated the best of those published ideas and now offer a ...
Re-greening the Heathkit IG-18: IG-18 #1 - Tronola
http://www.tronola.com/moorepage/IG-18-1.html
The IG-18's weaknesses: As chronicled by Reg Williamson, writing in the Audio Amateur magazine in 1971 (a PDF of the article is here-- search for "IG-18 Mod"), the original IG-18 had many problems. Reg was the first I'm aware of to "green" the IG-18, and his comments and mods led Heath to make some design changes after the article appeared, and ...
Heathkit IG-18 Audio Generator - Page 1 - EEVblog
https://www.eevblog.com/forum/testgear/heathkit-ig-18-audio-generator/
Heathkit IG-18 Audio Generator. Bought this for the approximate price of a decent metal case and some switches. Surprisingly still worked, seems to be mid-late-60s or something like that. It's not exactly a low distortion generator by todays standards (about -65 dB THD), but back in the day it was probably pretty good for a DIY kit.
LOW DISTORTION AUDIO GENERATOR. - Angelfire
http://www.angelfire.com/electronic/funwithtubes/IG-18_Mod.html
LOW DISTORTION AUDIO GENERATOR. Modifying a Heath IG/SG-18 for ultra low distortion. Additional notes as of July 11, 2013. I bought and assembled the IG-18 kit before I got married. Sue and I were married in June of 1971 so the unit is most likely 43 years old and possibly 44. ... When I made the original mods I was using a Heathkit IM 5258 ...
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