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Old 6th June 2013, 06:38 PM   #1
b3nny11 is offline b3nny11  Yugoslavia
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Lightbulb NOS GU-81


I just wondered how much does one NOS GU-81 vacuum tube cost.
i found a Man who has new tubes and he's selling them for 2000 RSD that's around 17.5385 EUR
so i think that's a preatty good deal. isn't it?
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Old 7th June 2013, 12:44 AM   #2
roline is offline roline  United States
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Are you going to make an amp that runs on 1 to 2KV B+ ??
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SO many tubes, SO little time!!!
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Old 7th June 2013, 02:27 PM   #3
b3nny11 is offline b3nny11  Yugoslavia
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i tought more of a tesla coil. i just wondered how much does one cost.
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Old 7th June 2013, 02:35 PM   #4
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''GSTube.com''. Tubes, sockets etc. Search result for <u>gu-81</u>

gstube wants 64 USD for one tube. 17.5 Euros seems like a good price for a big tube, to me.
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Last edited by ethermion; 7th June 2013 at 02:36 PM. Reason: grammar
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Old 19th June 2013, 10:17 AM   #5
AJT is offline AJT  Philippines
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i bought a bunch of tubes from this guy....
they were all good...
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Old 19th June 2013, 03:06 PM   #6
b3nny11 is offline b3nny11  Yugoslavia
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Talking have fun reading this... -_-

lool pardon me not beeing online... well the tube arrived 11.06.13 and it even bigger as i immagined. i was blown away when i unpacked it! it's massive! i found a audio amp schematic from a german guy... elo.maanders GU81 Tube Amp / Röhrenverstärker Trafo+Anodenglühen - YouTube
and wired the tube up with the stuff i got... but not quite the voltages you see there... the max voltage i got from the transformer was ~670V the output transformer was some from a 3 w amplifier but it had some power itself... i used this Visual Analyser to generate frequency... the max voltage i messured with the multimeter was 2.7v @ 100Hz everything more or less was under 2.7v i used a 130W speaker and it just worked a treat... the sound quality was aswesome the bass was good but the higher frequencies just too loud until the bass kicked in..! no buzzzing or somesort of!... i was pretty amazed. i had it on for like an hour and the room just got too hot i had to turn the fans on it's pretty crazu how much heat can generate one tube... and yes i got shocked 3 times... i accidentaly touched the Top grid3 connector. it allso burned some hair on my arm the second time!
i'm getting more of these tubes pretty soon!
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Old 24th June 2013, 05:47 PM   #7
hpeter is offline hpeter  Europe
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GU-81M Pentode - Röhren: Odd Ball
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Old 24th June 2013, 05:51 PM   #8
hpeter is offline hpeter  Europe
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Quote:
Originally Posted by b3nny11 View Post
well the tube arrived 11.06.13 and it even bigger as i immagined. i was blown away when i unpacked it! it's massive!
same to me happened when saw in person my glass toys
i was like -what the f** am gonna do now with this beast ?!?!
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TASCAM US200 -> JJ ECC803/6L6 headamp -> Beyers DT990pro 250Ω # ..intrigued by screen drive & G1 FB sound
https://plus.google.com/photos/10110...12393782517569 ____ http://youtu.be/iL9809xtif4
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Old 24th June 2013, 06:04 PM   #9
b3nny11 is offline b3nny11  Yugoslavia
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slovensko, hmm... tato stranka je z tyzdna na tyzden zaujimavejsia!
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Old 24th June 2013, 06:06 PM   #10
hpeter is offline hpeter  Europe
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TASCAM US200 -> JJ ECC803/6L6 headamp -> Beyers DT990pro 250Ω # ..intrigued by screen drive & G1 FB sound
https://plus.google.com/photos/10110...12393782517569 ____ http://youtu.be/iL9809xtif4
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