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Single tube, Single ended, 20W, impossible?
Single tube, Single ended, 20W, impossible?
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Old 3rd April 2012, 12:01 AM   #31
MelB is offline MelB  Canada
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My that's some coincidence. I just built a GM-70 amp. Insanely nice tube. And very cheap. That's a hammond 18v 5 amp trans for it's filament supply. Ya 60 watts for the filament. It's just like a light bulb. This is my first iteration. Just using a Hammond 300-0-300 transformer gives me 810v on the plate. The power supply is designed for max 1200v though. I will switch in a 400-0-400v Hammond after some more testing. Should get about 1050v on the plate. I'm stopping there.
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Old 3rd April 2012, 12:11 AM   #32
Wavebourn is offline Wavebourn  United States
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Single tube, Single ended, 20W, impossible?
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My that's some coincidence. I just built a GM-70 amp. Insanely nice tube. And very cheap. That's a hammond 18v 5 amp trans for it's filament supply. Ya 60 watts for the filament. It's just like a light bulb. This is my first iteration. Just using a Hammond 300-0-300 transformer gives me 810v on the plate. The power supply is designed for max 1200v though. I will switch in a 400-0-400v Hammond after some more testing. Should get about 1050v on the plate. I'm stopping there.
I would put a mirror between tube and transformer. Too hot and too close.
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Old 3rd April 2012, 01:04 AM   #33
Adipocere is offline Adipocere  United States
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I would put a mirror between tube and transformer. Too hot and too close.
No no no! That will just reflect the heat back to the tube's plate! The endbell won't be hurt by a little heat.
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Old 3rd April 2012, 01:17 AM   #34
MelB is offline MelB  Canada
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It's a lot further away than it looks in the other picture. It is not a problem at all.
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Old 3rd April 2012, 01:18 AM   #35
Wavebourn is offline Wavebourn  United States
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Single tube, Single ended, 20W, impossible?
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No no no! That will just reflect the heat back to the tube's plate! The endbell won't be hurt by a little heat.
It depends on how much is "Little". And how "cheap" is transformer for such an amp.
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Old 3rd April 2012, 01:19 AM   #36
Wavebourn is offline Wavebourn  United States
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Single tube, Single ended, 20W, impossible?
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It's a lot further away than it looks in the other picture. It is not a problem at all.
Sure, I see now how far it is, how anode is oriented, and how shiny is the bell itself.
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Old 1st June 2017, 05:43 PM   #37
vdi_nenna is offline vdi_nenna  United States
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Is this tube capable of what you are asking? Maybe it requires a driver stage?
www.thetubestore.com - 6C33C-B Audio Tubes

I was once looking for the same thing. There's a Glass Audio article by Erno Borbely out there for a 15w SE with this tube, but I believe it's two stage. I have it if you'd like a copy.

PM me, if interested.

Vince
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Old 1st June 2017, 07:32 PM   #38
davorin is offline davorin  Croatia
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QE08/200 is good tube for ~20W output power in single end topology (A1).
QE08/200-D3a Se-ClassA-Triode connected
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Old 1st June 2017, 07:34 PM   #39
211hojbjerg is offline 211hojbjerg  Denmark
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Hi All,
in LA Vol. 8 you can find a 100W SE tube amp base on GU81 output tube. 0,02%@100W.

best regards
Karsten
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Old 1st June 2017, 08:18 PM   #40
leadbelly is online now leadbelly  Canada
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Single tube, Single ended, 20W, impossible?
Why would you revive an old thread and still not address OP's request fully?
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