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post #736 of 1139

Sound meters like everyone else. Is that what you mean? :confused:

post #737 of 1139

A few weeks ago I was alerted by GrindingThud (Thanks!) for a copper radiators 6AS7G that I've been looking hard for sometime now.

 

I was under the impression that it was a 1948 Ken-Rad as the seller mentioned.

 

Today as I was cleaning the pins I noticed the base had a faint logo.

It's a Cunningham 6AS7G with date code B3C.

 

 

Processed By eBay with ImageMagick, R1.1.1.M2b

post #738 of 1139

That great Stavros!

 

My pair is labeled by GE in nice GE boxes. GE did made some tubes for RCA in the early 20's!  Your looks exactly like mine with the wire insulation and the way the copper was cut. There is quite a history between Cunningham, GE and RCA. It may be possible that your tube was made before 1925 but I think it may be too early. RCA did not make their own tubes until latter. The copper radiators 6AS7G's  has to be one of the earliest 6AS7 made.

 

You can get the Cunningham Radio Tube Data Book on Amazon for $20 which covers 1923 to 1924

 

http://www.vacuumtubesinc.com/TubeTidbits/TheFoundingofRCA.aspx


Edited by john57 - 5/6/13 at 9:03am
post #739 of 1139

Thanks for the great link John.

It was James Cross who sold me the tube, it's a small world.

post #740 of 1139
Quote:
Originally Posted by john57 View Post

It may be possible that your tube was made before 1925 but I think it may be too early.

 

Yeah, too early. According to Sibley's Tube Lore the type was registered in 1946.

post #741 of 1139

What is the difference between the RCA 6AS7G with the small red logo and the larger lettering logo? And, the large gray lettering for that matter.


Edited by dminches - 5/6/13 at 12:02pm
post #742 of 1139

Different production years, the red logo been the newest.

post #743 of 1139
Quote:
Originally Posted by Oscar View Post

 

Yeah, too early. According to Sibley's Tube Lore the type was registered in 1946.

From what I can tell since Cunningham and RCA were suing each other RCA had to make any tubes that Cunningham demanded until 1925 by court agreement. After a bit of more digging I find that Cunningham was making unlicensed tubes outside of the agreement and RCA sue again and by this time World War II started. The government need all the tubes and they allow Cunningham to make tubes until the end of the war and Cunningham folded. That is as far I know. I do not have the Sibley Tube Lore book since it is about $185 and I am not a tube historian but a tube buff!smile_phones.gif


Edited by john57 - 5/6/13 at 12:51pm
post #744 of 1139
Quote:
Originally Posted by john57 View Post

I do not have the Sibley Tube Lore book since it is about $185 and I am not a tube historian but a tube buff!smile_phones.gif

 

That's a crazy price! I didn't pay anywhere close to that. The book must be out of print.

 

How did my name got anglicized? confused_face_2.gif

post #745 of 1139
Quote:
Originally Posted by Oscar View Post

 

That's a crazy price! I didn't pay anywhere close to that. The book must be out of print.

 

 

 

The book is out of print for some time. Looks like that only the first edition was printed in 1996 The lowest I seen so far is $174 and goes up to over $600

It must been the forum auto word checker of sorts. If I click on the new name it goes back to your old name. This happens to my cousin all the time.


Edited by john57 - 5/6/13 at 2:55pm
post #746 of 1139
Quote:
Originally Posted by john57 View Post

The book is out of print for some time. Looks like that only the first edition was printed in 1996 The lowest I seen so far is $174 and goes up to over $600

 

Insane. Mine's a 1996 copy but came with Supplement 3 dated 2002.

 

It must been the forum auto word checker of sorts. If I click on the new name it goes back to your old name. This happens to my cousin all the time.

 

Weird. Thanks for the explanation.

post #747 of 1139

I payed $70 for my Tube Lore a couple of years ago when Oskari told me about this book.

post #748 of 1139

I am sure my copy was only somehing like $15 in late 96, early 97! Good book.

post #749 of 1139

http://www.ebay.com/itm/271197264430

 

I wonder why they are bidding $680 for 8 tubes that aren't even 2399/5998/421A. they're "normal" 6AS7G, sure they have the nice copper Chatham grids but are people that easily fooled? (I paid $20/tube for these a while ago)

 

What am I missing (besides that they're supposed to be "matched")?


Edited by Ultrainferno - 5/7/13 at 5:38am
post #750 of 1139

I saw them a few days ago, tube prices are getting out of hand.

 

BTW some traders have dual ID's and bid to raise the price of their items.

To be clear I am not suggesting this is what's happening in this auction.

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