Heatsinks and ULA chips.

[Nick]

Tek. 2465B: Yes, seriously impressive spec.

It all went wrong for the U800s when in 1994 Tektronix sold off their internal manufacturing of the hybrid chips to a Maxim-Tektronix joint venture, imaginatively called "MaxTek" - the Maxim (later) ones are the ones that fail - the earlier (Tek-made) ones are great.

In 2000, MaxTek gave up making the chips as they didn't like doing the small production runs and so insisted that Tektronix did a last "one-time-buy" - this effectively killed off the whole 24xx analogue 'scope range. Tektronix then bought the business back... http://component-solutions.tek.com/about/

Below is an old photo of my test bench from 2003 - there is a Tek 2340A digital storage scope, and fully kitted out Tek 7904A (loved that 'scope!) and a Tek 2465A (now replaced by a Tek 2465B).