Mod 122C too...it is also an exceptionally stable instrument. I have a 577D1 as well, and it takes a couple hours before it is fully stable. I also have a second Type 575 with Mod 122C, equally as clean, but it's not so good functionally. I will be getting to it in the repair queue, possibly this winter when it's more fun to have toob gear heating the lab. ![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif.pagespeed.ce._hfWAz_QHO.gif)
Wow...two pristine 400V 575 ... and me just a crusty 200V one. Oh well... still so happy to have at least one example of the beast, regardless of specs or condition !
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/xgrin.gif.pagespeed.ic.QVVz6XIT20.png)
577 only one I saw for sale here was a year ago and teh guy wanted 2500 Euros for it... not even powered up / 100% unknown condition, yeah right !!!
![Banging Head |O](https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif.pagespeed.ce.8iLbFYV4Bc.gif)
I also gather these are a nightmare to work on, have plastic bits that break, and known weak points on unobtainium parts.. can't remember the specifics but quite scary especially given the price of the thing !
![Scared :scared:](https://www.eevblog.com/forum/Smileys/default/scared.gif.pagespeed.ce.oZptHNcbsD.gif)
My 575 was only 150 Euros, 15 times cheaper than a 577 and it's all bullet proof stuff, or fairly easy to repair at least. It's a boat anchor after all, it does come with its advantages...
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/xgrin.gif.pagespeed.ic.QVVz6XIT20.png)