The high-voltage power supply uses an RC filter to smooth away ripple, whilethe low-voltage power supply uses an LDO voltage regulator to provide a stable andnoise-free voltage output. PCB FeaturesB+ and Heater Power Supplies On the 5687 All in One board, two power suppliesreside, one for the high-voltage B+ for the tubes and a low-voltage power supply for theheaters. This assembled board with a chassis, volume control, selectorswitch, power transformer, and a fistful of RCA jacks is all that is needed. Byincluding the necessary components for the heater and high voltage B+ power supplieson the PCB, the5687 All in One board makes building a standard-setting line stageamplifier a breeze. Theboard is 7 by 6 inches, with five mounting holes, which helps to prevent excessive PCBbending while inserting and pulling tubes from their sockets.Įach PCB holds two Aikido line-stage amplifiers thus, one board is all that is neededfor stereo unbalanced use (or one board for one channel of balanced amplification). In addition, the PCB is lovingly and expensively made in the USA. This FR-4 PCB is extra thick, 0.094 inches (inserting and pulling tubes from theirsockets wont bend or break this board), double-sided, with plated-through heavy 2ozcopper traces. OverviewThank you for your purchase of the GlassWare Aikido 5687 All in One 9-pin stereoPCB. There are too few tube-loving solder slingers left wecannot afford to lose any more. If you are not an experiencedelectrical practitioner, before applying the AC voltage have someone who isexperienced review your work. In fact, alwaysassume that the high voltage capacitors will have retained their charge even after thepower supply has been disconnected or shut down. Once the power transformer is attached, be cautious at all times. Warning!This PCB contains a high-voltage power supply thus, a real and lethal shock hazardexists. There are too few tube-loving solder slingers left we cannotafford to lose any more. If you are notan experienced electrical practitioner, before attaching thetransformer windings to the board, have someone who iswell-experienced in electronics review your work. In fact, even when the power supply is disconnectedor shut down, assume that power-supply capacitors will haveretained their charge and, thus, can still shock.
Once the power supply is powered up, be cautious at alltimes. Remember that the dangerincreases by the square of the voltage for example, 200volts is four times more dangerous than 100 volts and 400volts is sixteen times more dangerous.
Ideally, a variac should be used to slowly power up theregulator, as it is better to have a mis-oriented electrolyticcapacitor or a mis-located resistor blow at low voltages,rather than at high voltages. IntroductionOverviewSchematicsRecommended ConfigurationsTube ListsAssembly InstructionsĭANGER!This PCB holds a high-voltage power supply thus, a realand possiblylethal shock hazard exists.