Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: deaftone on April 26, 2017, 01:53:10 pm
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Hello guys,
First of all thank you for the opportunity to improve my Blues Junior. Can't wait to fire it up!
I was looking for a similar topics but didn't find anything related.
My BJ Conversion is almost finished and the only unclear issue to me is the connection of the original international power transformer. Since this business might be very dangerous i have that someone could verify what i understand from the BJ schematics.
I don't have an original board which makes thing a bit difficult to me. So... The Export Power transformers has a lot of input wires and options .. 100, 120, 230 and 240 volt.
From the original BJ schematics (2005 model) for 240 V option i understand the following:
1. Violet wire goes to the switch (fuse side)
2. Black wire goes to the switch
3. Blk/grn and blk/yel have to be connected (according to the connection between points P9 and P10 on the board)
4. The rest of the input wires has to be untouched and isolated.
All these are marked on the attached screenshot.
I will be very grateful if someone can approve or disapprove it. Thank you :)
Anton.
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Welcome.
Your mark-up appears correct for 240V.
Bonus if you have a lamp-limiter for initial start-up. If something IS wrong, it is better to see the lamp glowing brightly than the transformer glowing brightly.
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Thank you!
I will definitely use the current limiting lamp before i start it up.
Best
Anton