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Products => Test Equipment => Topic started by: doktor pyta on May 16, 2014, 01:17:05 pm

Title: Tektronix 7704A voltage multiplier DIY replacement
Post by: doktor pyta on May 16, 2014, 01:17:05 pm

Some of theTEK 7000 series scopes use 21kV CRT high voltage to achieve high beam intensity.
 During years of exploatation HV part become defect- prone.
 The simple project contains PCB of 21kV voltage multiplier (similar to TEK 152-0493-00).
 The components should have parameters:
 Capacitors: 470pF...2,2nF /4kV
 Diodes: Irms>50mA RMS; Vr>4kV; trr<100ns
 The module must be well cleaned, dried in warm air, potted in urethane, silicone or epoxy.
 Use well insulated HVcable.
 It's better not to joke with 21kV.
 
http://rfscientific.eu/tektronix-7704a-voltage-multiplier-diy-replacement (http://rfscientific.eu/tektronix-7704a-voltage-multiplier-diy-replacement)

Title: Re: Tektronix 7704A voltage multiplier DIY replacement
Post by: David Hess on May 20, 2014, 06:05:58 pm

This looks interesting but I have not been able to access the linked web site and there is no parts list or construction details in the PDF file.  I assume it needs to be vacuum potted.