B+K 500 Testor Question

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just bought a B+K dyna quick 500 tester. It doesn't work. In checking it out
I noticed that the schematic says that the v-1 tube is and 83. My unit has an 8 pin socket with a 6ax5gt in it. It looks to be original. I have changed out the caps and rectifiers and the resistors tho not spot on are close to specs. Is there more than one version of this tester?
Any ideas? thanks for any help bob
 
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