the listing is for a used Tektronix  Transistor Curve Tracer Type 575 for spares or repair - item powers up - CRT graticule control alters light intensity but focus & brightness not working  - no green screen dot - removed covers - noted bad 6BW4 full wave rectifier (white at top) see photo 6 last valve on the right lower chassis rear - also same fault 12AU6 RF Pentode 50 Mhz & 6AU6A sharp cut -off Pentode upper chassis front see photo 7 fault easy to see - CRT support fine - the item would not function with problems found - all controls and switches fine clean inside  - the item was from auction - well worth repairing  - if further info required please email or mobile  07957238225 thank you