![]() ![]() The choke worked in conjunction with two 16 uf 450 volt capacitors to eliminate the ripple in the B+ supply.Ī bit of Vox mojo was inadvertently created by the GZ-34 rectifier tube. The GZ-34 tube converted AC voltage voltage from the power transformer to rippled DC. The original design for the JMI AC-30 B+ power supply included a GZ-34 full wave rectifier tube and a choke. This allowed the chassis to act as a heat sink for the tube sockets. While some earlier versions of the AC-30 had tube sockets mounted directly to the main PC board, the tube sockets for the AC30C2 were fastened to the chassis. It bolted to the amplifier cabinet with four large machine screws. The AC30C2 steel chassis had a "C" shaped cross section. It included spring reverb, tremolo, an effects loop and output jacks for extension speakers. The AC30C2 was a two channel amplifier powered by three 12AX7 and four EL84 tubes. ![]() Let's take a look under the hood at what makes the AC30C2 tick. ![]() It defeated amps from manufacturers such as Mesa Boogie, Marshall, Orange, Peavey and Fender. ![]()
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