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Tuesday, April 27, 2021

Making of 6CB5A Mono Amplifiers - Part 1

 Hi!

I just started assembly of 2 single ended 6CB5A amplifiers and will share the construction process.



Readers of my blog will know that I have a long history with the 6CB5A tube and always proposed it as an interesting alternative to the more mainstream tubes.



I have built numerous versions of this amplifier which uses a 6N7 as driver and a rectifier bridge with 6AX4 TV Dampers.



This time it is a fully fleshed out pair of mono blocks built in the floor standing tower style chassis, as used in recent amplifiers like the last Stereo 300B amp I built.




Once the bare metal plates arrive the assembly can begin. Here we see the 2 top plates which are mirrored to each other this time, and all the bits and pieces needed for the internals:



Mounting the tube sockets and some initial wiring:



The top plate with all parts mounted and wired:








The next level below the top plate carries the interstage and output transformers and some capacitors:



Below that another capacitor bank and filter chokes:



And on the bottom the mains power transformer and another 2 chokes:



All the sub assemblies of one channel:




Completion of the amps will continue when some missing parts arrive. Stay tuned for part 2 which will show the final steps of assembly and finished amplifiers.

Best regards

Thomas







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