Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Thisismyname on April 29, 2022, 10:28:17 am
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I'm rebuilding a friend's late 90s Blues Deluxe into a AB763 Bandmaster and using that circuit to tweak to his tasts. Essentially, he just wants a BF style circuit with a SS rectifier using 2 6L6. It'll be a single channel with the trem circuit.
However, I'm not 100% sure if the stock B-Dlx power transformer will be compatible with this circuit. I will include specs for both trannies.
First picture, D-Dlx. Second picture, Bandmaster.
The B-Dlx has 427v at the B+ and the Bandmaster has 440v, as per the 60s schematic. The B-Dlx has a relay circuit off of the bias supply.
What would be the best way to make this work?
Thank you for any and all help! 🙂
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I don't see any problems.
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So you're saying I can just build the complete Bandmaster circuit using this PT without any changes?
Sorry, my OCD makes it very difficult to be 100% sure of something.
Also, what are the factors that determine this relationship?
I can look into it more myself, I'm just not entirely sure which factors are involved.
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So you're saying I can just build the complete Bandmaster circuit using this PT without any changes?
Not exactly. You'll still need to build the PS like the Blues Deluxe because you must use a FWB rectifier and the separate bias winding is a bit different from the BM. But as far as the amp circuit, it will be the same.
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So you're saying I can just build the complete Bandmaster circuit using this PT without any changes?
Not exactly. You'll still need to build the PS like the Blues Deluxe because you must use a FWB rectifier and the separate bias winding is a bit different from the BM. But as far as the amp circuit, it will be the same.
On the Blues Deluxe schematic, keep the last two power tubes, remove the other two and slide everything up. Everything before your power tubes can be Bandmaster circuit but the power supply up to the filter caps to nodes X Y and Z on the BD will stay roughly the same as long as you are getting OK voltages for the bandmaster circuit. Those nodes become the B+ nodes for the new amp.
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[quote author=Thisismyname link=topic=28908.msg318216#msg318216 date
On the Blues Deluxe schematic, keep the last two power tubes, remove the other two and slide everything up. Everything before your power tubes can be Bandmaster circuit but the power supply up to the filter caps to nodes X Y and Z on the BD will stay roughly the same as long as you are getting OK voltages for the bandmaster circuit. Those nodes become the B+ nodes for the new amp.
What do you mean by removing 2 power tubes and keeping the other 2? The BD only has 2 power tubes.