Incredible quality... can't find this anywhere, although I think now Heathkit offers printed versions for a fee.

It's incredibly great, this awesome website helps me to repair a piece of measurement gear history. The manual is superb quality, the website owner is a very helpful guy. Thank your really so much !!!

greate that you helping others with this page, greate

Thank you very much for HEATHKIT IO-18 you are miraculous !

Superb Quality, Thank you, This manual is essential for IO-18 repair. Excellent website !

Thank you so much. I'm excited to have found you. Now to work!

Heathkit IO-18 download is perfect -thank you for prompt help!

Downloaded perfectly first time. Very many thanks for this file, and for this website, which is helping me to have a greast time restoring vintage kit.

Excellent quality pdf, thank you for the service. (I built an IO-18 in 1971 which is now lost.)

When my Heathkit IC-4802 Computer Oscilloscope bit the dust I found this model on EBay ... having found the manual here it is priceless ..Thank you

On a whim, I bought this scope on ebay, I have not yet received it but am looking forward to restoring it, and this manual is a really great start. Thank you - David

Great website, extremely helpful, Many thanks indeed, Ian

Got a good download in 1 try. Thanks for the service!!

Thank you - For keeping us old techs and the old equipment alive! - Jack

Absolutely fantastic website! Many thanks for the manual - I have rescued an IO-18 from the bin and now it has a chance of working for the first time in its life! No problems with the download - all pages intact. Thanks again. Clive

FILE WILL NOT DOWNLOAD COMPLETELY