Hi,
I almost finished my second tube amp. It's a 5F6A bassman. I bought parts from Ceriatone, and also based my build upon his layout:
http://www.ceriatone.com/images/layo...one_100508.jpg
I doublechecked all connections, so I put it on. But only for 1 second, because there is an enormous loud squal making me almost deaf. (I'm not exaturating)
I also saw some blue glow in my power tubes.
My volume controls are at zero.
I found this page on R.G. Keen's website: Squeals
But I'm not sure if we're talking about the same kind of squeal?
So, I should first change the preamp tubes. Mine are brand new JJ's for the ECC83 and 6L6 and Sovtek for the rectifier and EH for the 12AY7. Aren't these tested at the factory?
Maybe you guys know what the exact problem can be?
Also, here are some pictures of my build (if it is useful, I will try to make some more decent pictures):
http://members.lycos.nl/carrejans/amp2/amp001.jpg
http://members.lycos.nl/carrejans/amp2/amp002.jpg
http://members.lycos.nl/carrejans/amp2/amp003.jpg
http://members.lycos.nl/carrejans/amp2/amp004.jpg
http://members.lycos.nl/carrejans/amp2/amp005.jpg
http://members.lycos.nl/carrejans/amp2/amp006.jpg
http://members.lycos.nl/carrejans/amp2/amp007.jpg
Some remarks of my build. I soldered the 1 Ohm resistors of the power tubes to a screw of there socket. I also soldered the ground of the speaker jack to the same screw (not to my main star ground point)
I don't have the "E" connection at my power transformer, like on the Ceriatone layout.
I doublechecked all my wiring, but it looks all the same as at the ceriatone layout. Maybe there is a mistake in that layout?
There is a 5E7 labelling at the output transformer. Are they the same?
Another question: how should I use the bias pot? First at zero?
I hope we will find the solution.
Thank you...
I almost finished my second tube amp. It's a 5F6A bassman. I bought parts from Ceriatone, and also based my build upon his layout:
http://www.ceriatone.com/images/layo...one_100508.jpg
I doublechecked all connections, so I put it on. But only for 1 second, because there is an enormous loud squal making me almost deaf. (I'm not exaturating)
I also saw some blue glow in my power tubes.
My volume controls are at zero.
I found this page on R.G. Keen's website: Squeals
But I'm not sure if we're talking about the same kind of squeal?
So, I should first change the preamp tubes. Mine are brand new JJ's for the ECC83 and 6L6 and Sovtek for the rectifier and EH for the 12AY7. Aren't these tested at the factory?
Maybe you guys know what the exact problem can be?
Also, here are some pictures of my build (if it is useful, I will try to make some more decent pictures):
http://members.lycos.nl/carrejans/amp2/amp001.jpg
http://members.lycos.nl/carrejans/amp2/amp002.jpg
http://members.lycos.nl/carrejans/amp2/amp003.jpg
http://members.lycos.nl/carrejans/amp2/amp004.jpg
http://members.lycos.nl/carrejans/amp2/amp005.jpg
http://members.lycos.nl/carrejans/amp2/amp006.jpg
http://members.lycos.nl/carrejans/amp2/amp007.jpg
Some remarks of my build. I soldered the 1 Ohm resistors of the power tubes to a screw of there socket. I also soldered the ground of the speaker jack to the same screw (not to my main star ground point)
I don't have the "E" connection at my power transformer, like on the Ceriatone layout.
I doublechecked all my wiring, but it looks all the same as at the ceriatone layout. Maybe there is a mistake in that layout?
There is a 5E7 labelling at the output transformer. Are they the same?
Another question: how should I use the bias pot? First at zero?
I hope we will find the solution.
Thank you...
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