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ECC32 Tube Addicts - Page 7

post #91 of 102

My pleasure.

post #92 of 102
Quote:
Originally Posted by Oskari View Post

 

That YK is a date code; Oct. 67 like the stamp on the box, I think. DA indicates Mullard manufacture at Blackburn. The tube is unbranded. The British Services were not interested in brands, just the produce. [http://www.tubecollector.org/cv-valves.htm]

 

You know your stuff =)

 

Here's a shot of the top of the original box --

 

cv181jog.jpg

post #93 of 102

When testing ECC32s, which tube type should I use for the settings?  My B&K doesn't have setting for ECC32s.  I know the heater is 6, but what about the senstivity to check the gm.

post #94 of 102
I use the 6SN7 sheet, but you have to use a little math and guess at the right sensitivity setting, and then read the transconductance.
post #95 of 102
Thread Starter 

David some B&K circuits cannot measure a 6SN7 properly.

They use 19mA, whereas the proper current is 9mA.

What that means is they undervalue the 6SN7.

So if a B&K shows a good reading for a 6SN7 you can be rest assured it's excellent.

 

For the ECC32 I would expect a 70% of a 6SN7 value to mean a NOS tube.

post #96 of 102

Stavros, your math works well.  My pair reads 20/20 which is about 70% of 30 which is what I usually get with an NOS 6SN7.

 

Thanks guys.

post #97 of 102
Thread Starter 

Hi David, you are most welcome.

Any chance of a photo please?

 

Do they have the 1185 XXX date codes?


Edited by rosgr63 - 6/16/12 at 11:03am
post #98 of 102

Yes.  Here's a photo.

 

What can you tell me about the tube?

 

 

 

 

ECC32.jpg

post #99 of 102
Thread Starter 

This is the military CV181 version, with 1185 A3 date code.

 

Brown base wire getter, very nice sounding tube.

Can I see a slight cathode boil off mark?

post #100 of 102
Mullard, I assume?

No, that is just the light and flash. The tops are clear.
post #101 of 102
Thread Starter 

Mullard

post #102 of 102

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