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Old 4th December 2008, 06:46 PM   #11
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Thanks for the information on the sockets. I also had to use a lever to extract the GU50's from the socket. I wanted to test the rest of a batch I had bought, but never did it due to fear of messing to much with the valves and eventually breaking them...

Great info on the feedback! I have open baffle speaker and have been reading for a while on the benefits of a transconductance amplifier to feed them. Pentodes without feedback seemed to be the ideal solution, but I was scared off by the comments about odd harmonics and the like produced by pentodes...now I know that at least you have had good succes with feedbackless GU50 in pentode. Thanks!

About the sockets... I will not sell them due to this project above that one day should be accomphished.

Sorry that I can't be of more help to your original question, but thanks for the several answers yoy gave throughout the thread.
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Old 4th December 2008, 08:10 PM   #12
beamnet is offline beamnet  Netherlands
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whenever you are in the neighbourhood of zwolle, drop by and comelisten...

My amp used to be kt88, but in my opinion GU50's really have much more life to them. Probably it's not äudiophile" but yet...
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Old 6th December 2008, 08:29 PM   #13
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Quote:
I'm strongly suspecting the Tung Sol New Edit 6550 isn't made with properly outgassed materials.
Do the svets seem to last a long time?
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Old 7th December 2008, 12:52 PM   #14
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Hi Beamnet (used to know your real name, but forgot it...)

Thanks for the invitation.

Erik
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Old 7th December 2008, 01:25 PM   #15
beamnet is offline beamnet  Netherlands
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The name is Bas, the alias is from a long time ago when I used to maintain www.geocities.com/beamnet
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