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Post by dicky on Dec 10, 2011 12:27:59 GMT
Hey you guys, There are no markings on these valves, can anyone identify them from their construction/layout? All I know is they are not 6922 (or equivalent) as they measure very differently - with the tester set to measure 6922. I see there are several valves that are the same size and with the same pin configuration. Could they be ECC83s? Regards,
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Deleted
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Post by Deleted on Dec 10, 2011 15:04:22 GMT
measure Ohms between pin 4 and 5 next measure between 4 and 9 and 5 and 9. If this is half the value of 4-5 it's a 12V tube. a shield between the halves is oftebn connected to 9 as well. 9 must be connected to ground preferably.
6922 only show a resistance between 4 and 5 If 9 measures nothing to 4 or 5 it is probably only connected to a screen in between the halves.
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Post by PinkFloyd on Dec 10, 2011 15:33:28 GMT
ECC82 by the looks of them.
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Post by dicky on Dec 11, 2011 10:07:33 GMT
Thanks for the replies, chaps. I've measured the resistance as suggested and I get: 4-5: 2.2 ohms 4-9: o/c 5-9: o/c So they must be 6922 or do ECC82's have the same resistances? They seem to work well enough (in an X10-D) but when I put them on a valve tester (AVO CT160) set up to measure 6922 valves they measure nothing like any of the other valves I have. Maybe they're just worn out (although they seem to have identical performance.)
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Deleted
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Post by Deleted on Dec 14, 2011 18:57:39 GMT
It's not an ECC82, nor ECC81, ECC83 Most likely an ECC85 (or 6AQ8 = B719 = 6L12) ECC85 has a screen connected to pin 9 between both halves and is 6V type so all hints point in that direction ...
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Post by dicky on Dec 14, 2011 19:20:32 GMT
Thanks, Frans. I'll look up the parameters for ECC85's and see how they fare.
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Post by PinkFloyd on Dec 14, 2011 20:08:35 GMT
It's not an ECC82, nor ECC81, ECC83 Most likely an ECC85 (or 6AQ8 = B719 = 6L12) ECC85 has a screen connected to pin 9 between both halves and is 6V type so all hints point in that direction ... I have an ECC82 (Marshall) that looks pretty identical but bow to your superior knowledge
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Post by dicky on Dec 16, 2011 12:21:46 GMT
Well, it seems they are ECC85s after all. And they measure very well too - 100%/10.4mA @6ma/V.
The thing is, the anode voltage is 250V compared to 90V for ECC88. So, can they be used in a XCAN V2 or X10-D? They 'work' in the X10-D - but I guess not optimally.
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Post by dicky on Dec 16, 2011 16:54:57 GMT
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FauDrei
Been here a while!
Posts: 489
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Post by FauDrei on Dec 16, 2011 17:15:21 GMT
You guys are nuts.
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Deleted
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Post by Deleted on Dec 16, 2011 19:20:17 GMT
You guys are nuts. You have to be in this hobby !
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XTRProf
Fully Modded
Pssst ! Got any spare capacitors ?
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Post by XTRProf on Dec 18, 2011 10:05:11 GMT
Can't you guys see his avatar?
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