27-07-2015, 02:56 PM
Perhaps, perhaps not. I rather doubt that Tek designers would make that kind of design decision. I base this comment on the HT delay relays found in many of their scopes. HT isn't applied to the bulk of the circuitry until the valves are warmed up.
My best guess is that the 6U8A was a standard item in the Tek stores while the 6U8 was not. As a designer of fairly low volume kit I was always urged not to proliferate different parts unless it was genuinely necessary. This sort of rule doesn't apply to high volume production, where if you can shave 0.5p off the cost of a unit by using a slightly different part then that's good value engineering.
My best guess is that the 6U8A was a standard item in the Tek stores while the 6U8 was not. As a designer of fairly low volume kit I was always urged not to proliferate different parts unless it was genuinely necessary. This sort of rule doesn't apply to high volume production, where if you can shave 0.5p off the cost of a unit by using a slightly different part then that's good value engineering.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
