Vacuum tube ! And Warnings


To all out there who have Vacuum tube Amplifiers .
my friend just bought his first tube amp , it came with EL34 power tubes he wanted to get a bit more punch . He ordered on EBay  6550s I told him I would assist in fine tuning the bias.
he plugged them in we turned it on and a huge transient goes through one of the speakers and a surge through one tube . I shut it down waited 5 minutes then turn it on bias has a built in meter ,I checked they were over 90 +milliamperes maxed the meter. should be around 50. I removed them , he is sending back.the story here is many Ebay sellers don’t even test them they just get them from Russia and state as a match quad ,and runin for 24 hours . Never buy from anyone that doesnot  personally check them .
viva tubes, and upscale Audio are good , Jim mc Shane is good.
for vintage tubes, Brent Jesse recording, and Vintage tube services   I recommend. 
audioman58
I tend to disagree as there are some long term excellent dealers on eBay. The trick is finding them, that’s all. I bought a whole bunch of tubes on eBay about 6-8 years ago , everything from Chrome Domes to Badboys to WWII Tung Sols, always had great results. 
stereo5
"I would never buy tubes off eBay. That was the first mistake."


In the last 12 months, I've purchased around $1k worth of NOS tubes from sellers on Ebay. Zero problems. Years ago, when I had an amp that used 6C33 tubes, I purchased at least $500 worth from sellers in Russia and the Ukraine. Zero problems. I always purchased from sellers that had 100% positive feedback.
I have had 2 bad experiences on eBay. Not for tubes, but for other audio equipment.  In one case, it was an Acrolink cable that never materialized after waiting 9 months.  The other was on an amp that arrived broken (not from shipping) and had a very hard time getting a refund.  Too many amateurs selling on eBay so now I avoid at all costs. 
agree with Stereo5 on why would anybody buy tubes off of Ebay ?   

if you knew your friend was going to get tubes, why not suggest getting them from a tube dealer that would have the tubes matched / tested ???

there was another thread recently about someone getting tubes from Ebay and they are all shocked that they were junk.    duh.....