Tektronix 464 oscilloscope repair, channel off screen/large offset and other issues

The trusty Tek 464 suddenly lost channel one, it turned out that the channel was still there but way off screen to the negative. It also had some other faults which are inconvenient but don't make it unusable, therefore i just lived with it until now, Since we had to go into it, we addressed most of these as well. This episode shows the fix of the non working channel, the following episode covers some of the other issues and a rather surprising performance test. The Tek 464 is a 100MHz analogue storage scope which utilizes a variable persistance CRT, that means everything is done with the CRT, no digital electronics involved whatsoever. The CRT actually writes and stores everything in real time. List price in the 1978 Catalogue is $4120 plus $125 for option 07 (12V DC supply option ). Being a Tek scope from the good old days (made in 1978) it well exceeds the specs, as we show in the next episode. (c) 2020 www.dynoguy.co.uk