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Old 20th April 2003, 03:23 PM   #11
EC8010 is offline EC8010  United Kingdom
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tubetvr,

thanks for looking. I eventually found it under "obsolete" in my 1957 GEC book. and since it appears to be a KT61 on a Loctal base, and I do have the data for KT61, I am now sorted.
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Old 21st April 2003, 03:25 PM   #12
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Default A final word...

...I was just checking an old Brimar manual for another tube and came across the KT81 and, lo and behold, it is listed as an equivalent for the 7C5, a tube with completely different operating characteristics. I think this sums up what has been said about the problems of relying on equivalents listings.

Even the 'Brimarizing' section of the manual didn't make clear about playing fast and loose with equivalents. Annoyingly the manual has a very good CV equivalents listing which I've used in the past, but now will have be careful with!
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