Hi guys, it has come to my attention that at least a couple of you have experienced blown fuses when using the GZ32 rectifier tube with the Transporter. We confirmed the same here, depending on the tube. I have reviewed the datasheet and confirmed the reason. We are using a cap-input filter with the Transporter, rather than a choke input type. All of the preamps and outboard supplies for the player mods use a choke-inpu filter.
If the first thing that the rectifier sees is a capacitor at its output, there is a large inrush current as the rectifier tube charges the capacitor. The larger the capacitor, the larger the inrush current. We are using a pair of 100uf-450V caps in series from B+ to ground, resulting in a net 50uf capacitor as load to the rectifier. The GZ32 recommends a max 60uf cap, but that is dependant of the resistance of the coil windings and input resistor value. The GZ34 and 5U4 have similar recommended limitations, but they perform flawlessly. As a result, I would simply recommend AGAINST the use of the GZ32/5V4 tubes in the Transporter.
The only thing that may happen, if the GZ32 rectifier is used, is that the 3A SB fuse may blow and need to be replaced. This does not in any way damage the unit or tube, but does require removal of the lid of the Transporter to access 3A SB fuse on the mod tube board. It is a 5x20mm size fuse.
Thanks,
Dan W.