Tektronix 434 s/n below 500000 faulty ps.

[johnmcgivern]

Sorry Craig, I am trying to check the frequency. I set 2 scopes tek434 and advance scope both with exact settings advance is bang on but the Tek seems to be more than twice the frequency shown on the advance with as I said the same settings.
Hope this makes sense using a HP 3325B set at 1000hz.