Vintage quad of Svetlana 6550C tubes. Test strong. - diyAudio
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Old 3rd February 2010, 08:40 PM   #1
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Location: western pa
Default Vintage quad of Svetlana 6550C tubes. Test strong.

Vintage 1997 Svetlana 6550C power tubes. Pulled from an Audio Research power amp, but test like new.
Svetlana Electronic Devices printed on front. Stylized S logo. Date codes 51 97. Twin angled getters. Rectangular holes. No original boxes. Tested on Hickock 532 mutual conduction tester where 5000 umhos is considered new on roll chart.
Test results:
tube 1= 6250
tube 2= 6250
tube 3 = 6250
tube 4 = 6000
Have 8, but am keeping 4. I am running them in a home brew kt-88 single ended amp. They sound great in this triode application. Original Svetlana 6550C have a reputation for great sound, and ruggedness.
Do a search at Audio Asylum tube forum for more info on these tubes.
$75 + actual shipping charge.
Thanks,
mg16
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Old 11th February 2010, 04:58 PM   #2
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Join Date: Feb 2010
Quote:
Originally Posted by mg16 View Post
Vintage 1997 Svetlana 6550C power tubes. Pulled from an Audio Research power amp, but test like new.
Svetlana Electronic Devices printed on front. Stylized S logo. Date codes 51 97. Twin angled getters. Rectangular holes. No original boxes. Tested on Hickock 532 mutual conduction tester where 5000 umhos is considered new on roll chart.
Test results:
tube 1= 6250
tube 2= 6250
tube 3 = 6250
tube 4 = 6000
Have 8, but am keeping 4. I am running them in a home brew kt-88 single ended amp. They sound great in this triode application. Original Svetlana 6550C have a reputation for great sound, and ruggedness.
Do a search at Audio Asylum tube forum for more info on these tubes.
$75 + actual shipping charge.
Thanks,
mg16
I have an Audio Research VT-200 amp. All the four quads are currently 6550C's with a Circled " C" printed on all the tubes. Are the tubes you have for sale the same as these in terms of sonics? They sound like they may perhaps be an earlier Svetlana version than the tubes in my amp. A tube in one of the quads in my amp has drifted in terms of emissions about 10% from the other three so this quad is not matched very well and I am considering replacing this quad. Could you e-mail me a photo of the tubes to jackweston@comcast.net Thanks. Jack
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Old 4th April 2011, 04:06 AM   #3
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Join Date: May 2007
do you still have these tubes for sale ?
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