Just looking at the powersupply , all the switches and sockets are good quality , all the wires are heat shrinked where they meet the teminals ,
The LT is regulated in the usual way but theres an aditional passive RC smoothing stage so the regulator doesnt have to drop too much voltage , HT has 6 stage RC smoothing , 22uf 400v , all the electrolytics are 105c rated , theres a pair of zeners at the end of the chain .
The polar patern switch is white ceramic and feels very solid , .125w resistors make it very neat and tidy .
The PCB is through hole plated so should be easy to rework or repair if the need arrises .
Transformer has 9.5v and 175v windings .
The grounds from the PCB , mains socket and upper part of the enclosure are all starred to a common point on the chassis , the common chassis connection at the XLR sockets does create a small ground loop ,the wire connecting the XLR's ground to the pcb might not be required as long as there good contact between the metal xlr housing and chassis , the paint might need to be scraped away in the vicinity of the
mounting screws and toothed washers and nuts added at the back ,
The finish on the case work of the mic is nice , the PCB is marked BV-300a ,
Inside is the usual suspect Shuguang tube , I found these tubes often badly microphonic brand new out of a box , the one in the mic is no exception , swapping out for a decent UK/US/or EU made tube is probably well worth doing .
Finally the 7 pin xlr cable looks like it will last years , the connectors are a bit like the old Cannon type with grub screws ,
All in all Im very happy with my purchase , although I do plan to replace the electronics in the mic itself .
For the 210 euros you cant go wrong , the T.bone Retro PSU , is available as a seperate item from thomann for 69 euros . Actually I just checked Don audio ,their PSU box alone is over 150 euros, by the time you have the extra accesories like XLR connectors ,dial scale and other components your going to be spending well over 250 euros before your up and running .