This is the reason I rotate my scopes to the test rack on a regular basis. I was going to put the Type 321A on test but when I powered it up I was greeted with this mess. No sweep. So today on the bench for troubleshooting.
![](https://imagizer.imageshack.com/v2/xq90/923/lkqW7T.jpg)
I figured another one of the germanium 2N2207 transistors had gone tin whisker short so armed with nothing more than the 87 set to ohms went to work. And in 5 minutes found the problem. Q183 in the pix. That 2N2207 had a tin whisker short back when I first got the scope and was replaced by me. Well, I should have checked my solder work a little more closely. The top lead (emitter) cold solder joint and had pulled away from the terminal strip.
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/xfacepalm.gif.pagespeed.ic.EBDwh1hCfo.png)
Do I kick myself in arse now or later?
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif.pagespeed.ce._hfWAz_QHO.gif)
Oh well.
Works great with good solder joints.
![Roll Eyes ::)](https://www.eevblog.com/forum/Smileys/default/rolleyes.gif.pagespeed.ce.XcUK202Yqt.gif)