Difference between 5687, 5687WA and 5687WB tubes? - Page 2 - diyAudio
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Old 23rd March 2005, 09:13 AM   #11
sajti is offline sajti  Hungary
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JJ ECC99 is really nice for driver, or line driver.

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Old 23rd March 2005, 09:21 AM   #12
6h5c is offline 6h5c  Netherlands
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--- off topic ---

Yep, I have them driving my KT88's as a long-tailed pair with a true current source in the tail. Sounds excellent.

Greetings,

Ray.
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Old 23rd March 2005, 05:18 PM   #13
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Hi there...the funny thing is.....recently I've put some replacement clone 6550 tubes in my MI amp and thev'e sounded brill... later found out that they were earlier versions of Svetlana 6550B with eroded markings.....I enquired about them...never to hear a reply from Svet nor have they ever explained the differences between 6550WA/WB series.......nor has there been a spec produced for the masses to see.
Question...Has anyone got something in a spec about these tuebs ?

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Old 24th March 2005, 01:27 PM   #14
6h5c is offline 6h5c  Netherlands
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Default 6550 spec's

Hi,

Nope, I did some nosing around but could not find anything useful.
I know that the 6550 has a max. platedissipation of 35W and the 6550A is supposed to handle 42W, like the KT88. Also max. voltages are a bit higher.

Apart from that, the Svetlana website seems to be down, or have they simply moved? It used to be www.svetlana.com

Greetings,

Ray.
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Old 25th March 2005, 05:20 AM   #15
sajti is offline sajti  Hungary
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Default Re: 6550 spec's

Quote:
Originally posted by 6h5c
Hi,

Nope, I did some nosing around but could not find anything useful.
I know that the 6550 has a max. platedissipation of 35W and the 6550A is supposed to handle 42W, like the KT88. Also max. voltages are a bit higher.

Apart from that, the Svetlana website seems to be down, or have they simply moved? It used to be www.svetlana.com

Greetings,

Ray.

Try
this link !

sajti
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Old 25th March 2005, 08:04 AM   #16
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Default Re: Re: 6550 spec's

Quote:

Try
this link !

I've tried that link........dead ....no sign of life. I can only assume like alot of business in Russia have mysteriously disappeared, corrupt and untraceable. Someone must know better.

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Old 25th March 2005, 08:49 AM   #17
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That link works for me. Seems like svetlana har changed name to winged C
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Old 25th March 2005, 09:59 AM   #18
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The link works but there isn't anything on that site.

Quote:
Originally posted by Tekko
Seems like svetlana har changed name to winged C
Umm... sort of. The US distributor of Svetlana went under, and sold out to New Sensor (i.e. of Sovtek and EH fame) and a court battle ended with the US rights to use the Svetlana name owned by New Sensor. Hence, the original Svetlana valves (from the Svetlana factory in Russia) had to find a new name. So now there are two Svetlanas!

Well, that's how I think it happened.
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Old 25th March 2005, 10:20 AM   #19
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There sure are stuff on the site, just click "the rest of the world"
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Old 25th March 2005, 10:26 AM   #20
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Clicking on "Rest of the World" just gives me a message that the site does not provide a service to the US and Canada.
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