winged c 6550c is not good for ref 5se??


I ordered 3 of svetlanan SED winged C 6550c from 'Upscale audio' last week and it was not shipped until today, so i call them to find out what is going on here.
They told me they didnt send it because " This tube is not going to work well with your audio research amp and it will failed almost every time".
Is it right?
brandon1103
Hi veerapaneni,In my system the GE 6550a sounds the best.On excellent recordings,the sovetek is great,but can sound thin on some music.The winged c is a good tube,i can understand why some people like this tube.On older cds,the GE comes into its own with,tone,good bass,air,soundstage,etc.After xmas,ill have to try a tung sol black plate.
After xmas,ill have to try a tung sol black plate.
http://app.audiogon.com/listings/tubes-tung-sol-matched-quad-6550-black-plate-from-1960-2014-11-23-accessories-07022-fairview-nj
Looks like the seller dropped his price. Great tube. My only concern if you would be interested in these would be are they black or grey plates. The date code indicates grey plates. There are 3 versions of the black plate. The oldest had a 3 getters on the top. Most common are the ones that have a single getter on top and 2 getters on 1 side. The last had a single top getter and a single getter on each side like the ones in the picture. I had all 3 types. The picture looks like black plates but pictures can be deceiving. I found a pair on ebay the seller said were grey plates and the plates looked grey but they were the most common black plates due to the getter arrangement. The sound difference between the black and grey plate is very close with the black plate being slightly warmer sounding.
You're welcome Misternice. Something I did find is when I owned Dynaudio C1 and C1 Sig's the TS 6550 black plate sounded fantastic. The *EAT KT88 and TS KT120 sounded horrible. But when I upgraded to Raidho the TS are too warm sounding and the KT150's are better but far from my favorite. Right now with the Raidho's D1 or D2 the Ei KT90 is my favorite. May need to try the EAT KT88 again.

* With my amp the Octave V70SE and now the V110 I have had horrible luck with the EAT tubes. I've been told the EAT was designed with a 450V plate voltage (although rated at 600V) and the Octave is 540V for the V70SE and low power for the V110. Out of a quad and pair I lost 3 within 60 hrs. Out of a quad of KR Audio KT88 (really EAT) I lost 1 in less than 20 hrs and still have 6 left. But that said I did buy the tubes used from a great reliable seller. The EAT KT88's were the most linear/detailed/clearest sounding tube for the short time I could listen to them.
The issue isn't with the Preamp, it's with the Winged C 6550. Don't use them! The last of those tubes that came from the factory before the plant burned down were awful tubes. Use a 6550WE. That is what ARC is using now.