Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => AmpTools/Tech Tips => Topic started by: pullshocks on March 22, 2021, 12:47:37 am
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Some of you on this forum have breadboards bigger than my whole house.
Here's a "kinda sorta" breadboard in an Judybox amp chassis I got years ago. It has a PT with 265-0-265 and 320-0-320 taps, and an available 45 volt bias tap, if I ever venture into fixed bias circuits.
My goal with this is to try a few different preamp circuits
The circuit board is in 2 layers. The longer, lower layer has a generic 6v6 push pull cathode bias power amp soldered in place.
The upper layer consists of 4 rows of terminal strips, one of which is wired up as a ground bus. Leads are soldered to the tube sockets and can be connected t the screw terminals. It will accommodate all the preamp circuits I had in mind (thank you DIY LC for helping me confirm that)
It takes a fair amount of time to wire it up initially, getting the leads bent to fit the spaces. But disassembly and temporary connect and disconnect is a lot quicker for me than desoldering and resoldering.
Once wired up, a lid can be screwed on the shell. and within reason, moved around like any other amp head. I wouldn't take it on a world tour, but the assembly is secure enough to move from the shop to a playing area for playing tests.
First up is the Benson Monarch.
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I like the approach.
With a similar goal in mind, I put together a set of pre-configured PCBs from Merlin's website. These boards are engineered well, BUT are a pain in the neck to tinker with as you have to dismount the board from the chassis in order to desolder any component.
In addition, it's a bit difficult to keep track of what trace connects where . . .
So, your idea is the winner. Merlin's idea -- and my implementation of it -- not so much.