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Old 29th May 2004, 06:06 PM   #1
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Default Difference between CK6528 and 6528A ?

Hi there.

I ned your help regarding some tubes. I have been offerede to by some Raytheon CK6528, NOS NIB 12 Pcs. When searching the web there is some talk about the 6528(A) being great for OTL and SE amps. It`s a quite cool tube with exelent data. The desige is werry ruged and they are quite heavy. It compares to a pair of 6080 +. The simple question is - what is the difference between Ck6528 and 6528A.


PS the seller has more and i might be able to by more from him, so if annyone os you are interested in some of these - let me know.

911jensen@ofir.dk


Thanks in advance for your time and advice.
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Old 29th May 2004, 06:36 PM   #2
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You are probably FINE with those tubes. The "CK" prefix is something Raytheon added to their products, both vacuum and SS. To nail things down completely, do some research to determine if there are any important differences between the 6528 and the 6528A.
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Old 29th May 2004, 06:42 PM   #3
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Hi,

Quote:
It compares to a pair of 6080 +. The simple question is - what is the difference between Ck6528 and 6528A.
CK is a prefix used by Raytheon so those are both 6528s.
They are actually more related to the 6336 and 6336A (the 6336 having carbon plates, the A version has zirconium coated graphite), the 6528 being sort of a higher mu version if you like.

Other than the plates and perhaps a controlled heater start-up I wouldn't know of any difference between the two.

For OTLs Hiraga and Taki recommend the A version, I don't recall quite why this was though but I can look it up later.
Maybe SY knows this?

Cheers,
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Old 29th May 2004, 07:15 PM   #4
SY is offline SY  United States
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These tubes are terrible. Don't buy them. Don't use them. Awful, awful. Send them to me for proper disposal.

Frank: I haven't experienced much/any performance difference between the regular and A versions. They look pretty identical, too.
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Old 29th May 2004, 07:34 PM   #5
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Hi,

Quote:
Frank: I haven't experienced much/any performance difference between the regular and A versions. They look pretty identical, too.
Naturally I have datasheets for the 6336A, NOT the 6336, for the 6528, NOT the 6528A...

I'll try to look it up once I'm in bed... surely there's room for one more book

Ironic how deliberately not mentioning this tube in one thread almost guarantees that only hours later someone else comes up out of the blue with exactly that...


Cheers,
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Old 29th May 2004, 08:08 PM   #6
SY is offline SY  United States
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That's why I never say the name of the tube I use for my preamp; bad juju.
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Old 29th May 2004, 09:03 PM   #7
jlsem is offline jlsem  United States
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Quote:
The simple question is - what is the difference between Ck6528 and 6528A.
Is there really a 6528A? I've never seen or heard of one, although I've seen plenty of 6528's, 6336's, 6336A's, and 6336B's.

John
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Old 29th May 2004, 09:05 PM   #8
SY is offline SY  United States
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I can take a photo if you like, but it looks just like the non-A.
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Old 29th May 2004, 09:34 PM   #9
jlsem is offline jlsem  United States
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Quote:
I can take a photo if you like, but it looks just like the non-A.
Could be a heater current change with resulting higher transconductance like the 6336A, although it's hard to imagine it getting any higher than it already is.

John
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Old 29th May 2004, 10:19 PM   #10
SY is offline SY  United States
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Well, I've used them interchangeably. There doesn't seem to be any heater current difference, and if the gm is different, it doesn't show up in use.
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