Hewlett Packard 524A Counter
I am looking for a service manual/schematic to add in restoring this unit.
A link tot he HP memory project Frequency counter page: http://hpmemoryproject.org/wa_pages/wall_a_page_11.htm
A pratical small lab bench frequency counter:
HP 524A Counter Panel Label
HP 524A Counter Two lowest Digits are done with Meters
HP 524A Counter Back side Open:
HP 524A Counter Tube Layout:
HP 524A Counter Tubes
HP 524A Tube layout:
HP 524A Frequency Reference:
HP 524A Transformer or inductor?:
HP 524A Counter Circuit Strips:
HP 524A Counter Power Supply:
HP 524A Counter Middle Section:
HP 524A Counter Bottom Section:
HP 524A Counter Top
HP 524A Counter Temp Gage
