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The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)
May 21, 2022 at 9:03 PM Post #2,191 of 4,231
triod750 said:
Looking for tubes?

https://www.ebay.ie/itm/284365833934?hash=item42358646ce:g:CG0AAOSwhVJg6JZz

https://www.ebay.ie/itm/284365876532?hash=item423586ed34:g:ERAAAOSwYZtg6KGC

https://www.ebay.ie/itm/284641403224?hash=item4245f32158:g:8LwAAOSwaT1h~5zb

You can save on combined shipping...
Click to expand...
The latter two are actually not a bad deal. Especially the second auction as I don't believe those are 6C5G. I think they are mislabeled 6J5G. The 3rd auction is about the going rate these days for NOS 1949 GEC 6J5G - but perhaps there should be a discount for buying 10 :)
 
May 21, 2022 at 9:31 PM Post #2,192 of 4,231
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May 21, 2022 at 10:28 PM Post #2,194 of 4,231
May 21, 2022 at 10:44 PM Post #2,195 of 4,231
triod750 said:
Looking for tubes?

https://www.ebay.ie/itm/284365833934?hash=item42358646ce:g:CG0AAOSwhVJg6JZz

https://www.ebay.ie/itm/284365876532?hash=item423586ed34:g:ERAAAOSwYZtg6KGC

https://www.ebay.ie/itm/284641403224?hash=item4245f32158:g:8LwAAOSwaT1h~5zb

You can save on combined shipping...
Click to expand...
The second one is actually GEC L63. They are definitely different than the Cossor 6C5G rebrands Langrex has. The seller sent me an offer for 385 GBP a few months ago when a group buy fell through. Even with shipping at 65 GBP + tax it comes out to roughly $62 USD per tube / $124 USD per pair. If someone is interested in trying to organize another group buy I’d be in for a pair. They’ve been up for sale forever so maybe the seller would negotiate down further...
 
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May 22, 2022 at 10:37 AM Post #2,198 of 4,231
May 22, 2022 at 10:38 AM Post #2,199 of 4,231
The mood seems to be going towards the L63 types.... I have a pair ST shape, used, and I was quite disappointed with the sound.

I have a pair of Raytheon 6J5WGT and these are rather good - very clear.

The one I'm liking is the CV6. I have box plates, not round plates. Not so keen on the E1148 though and even less on the 7193.

Anyone still using CV6?
 
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May 22, 2022 at 6:48 PM Post #2,201 of 4,231
I have a pair of these as loaners and have tried to love them in different combinations without success. They have left me cold.

1653259158708.png


Now I have found a pair that is changing my feelings. With these as output tubes both the violin and grand piano sounds natural.

1653259610804.png


(Both photos borrowed).
 
May 22, 2022 at 9:07 PM Post #2,202 of 4,231
maxpudding said:
I like the lead caps :dt880smile: Did you experience any microphonic/feedback noise with the 7193/2C22 tubes in your amp?
Click to expand...
No microphonic issues at all. Very quiet too. I was expecting a little more noise with the exterior leads like that, but no such problem.
 
May 23, 2022 at 1:46 PM Post #2,203 of 4,231
The truth, the whole truth and nothing but the truth about tube date and manufacturer coding?

"The letters in the box containing the arrow are the date code,
the first two being the year and the latter two the month or in
an alternative scheme the week using calendar date format.
They show the date when the lettering was applied which may
not be the same date as when the valve was manufactured.
In the other box the first letter is the approval status and the
second the qualification level. There may be one or two letters
following the oblique stroke. These show the valve supplier;
being defined as the place where the pumping process was
completed i.e. the electrode assembly could have been
manufactured elsewhere or even by another manufacturer.
This scheme was often used by members of the BVA for
commercial valves and by semiconductor manufacturers e.g".

From http://www.vmarsmanuals.co.uk/newsletter_articles/cv_valves
Don't remember where I got it from.
 
May 23, 2022 at 2:32 PM Post #2,204 of 4,231
triod750 said:
I have a pair of these as loaners and have tried to love them in different combinations without success. They have left me cold.

1653259158708.png

Now I have found a pair that is changing my feelings. With these as output tubes both the violin and grand piano sounds natural.

1653259610804.png

(Both photos borrowed).
Click to expand...

Very nice to be able to find out they did not have synergy with your amp...as loaners, rather than to find out, after having purchased them :wink:
 
May 23, 2022 at 3:07 PM Post #2,205 of 4,231
triod750 said:
The truth, the whole truth and nothing but the truth about tube date and manufacturer coding?

"The letters in the box containing the arrow are the date code,
the first two being the year and the latter two the month or in
an alternative scheme the week using calendar date format.
They show the date when the lettering was applied which may
not be the same date as when the valve was manufactured.
In the other box the first letter is the approval status and the
second the qualification level. There may be one or two letters
following the oblique stroke. These show the valve supplier;
being defined as the place where the pumping process was
completed i.e. the electrode assembly could have been
manufactured elsewhere or even by another manufacturer.
This scheme was often used by members of the BVA for
commercial valves and by semiconductor manufacturers e.g".

From http://www.vmarsmanuals.co.uk/newsletter_articles/cv_valves
Don't remember where I got it from.
Click to expand...
It has to be added that some date codes on tubes are neither manufacturing dates nor shipping dates but instead the date when the warranty on the tube expires. Go figure…
 
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