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Old 19th May 2014, 12:48 pm   #15
kalee20
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Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,061
Default Re: GZ34 data sheet discrepency?

Quote:
Originally Posted by Synchrodyne View Post
As long as the characteristics changes brought by the improvements did not disqualify the improved versions from applications for which the original versions were recommended, redesignation would not appear to have been imperative. Apart from lack of back serviceability, another trigger for redesignation would be that the improved version was intended to suitable for applications beyond the reach of original, i.e. what might be called lack of forward serviceability.
What I'd have been worried about in that case, is a design engineer using the 'new' data sheet, with the improvements, designing-in a GZ34 in an application which really does need the new ratings, , and then at some time in the future an 'old' type GZ34 being plugged in.

Sounds a recipie for disappointment.

When Mullard/Philips improved the PCL85, they rebranded it as PCL805 to guard against this happening. You can use a PCL805 in circuits designed for PCL85, but not the other way round. I've even seen valves laballed 'PCL85/PCL805'.

Maybe this thinking wasn't around in the GZ34 days?
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