Aligning repaired IF transformer

[Zenith26kc20]

Here's a fun (OK, maybe stupid question, sorry but it's got me wondering). I repaired a IF from a AA5 and was going to rough it in, out of the radio, alignment wise, off the chassis to keep from tearing up foils in case the frequency was too far off and I had to remove it again. I measured the capacitors (110 and 120 pf) and replaced them. I connected it to my frequency generator and started sweeping it. It appears to be 100 KHZ too low. I checked the generator with a frequency counter and it is correct. To double test, I connected a good 10.7 MHZ to the generator and it checks low also. I've read about checking IF transformers and ceramic filters out of the circuit so I am wondering if I am missing something. It would seem the IF would go up in frequency out of the chassis as the input capacitance to the next tube grid would parallel the secondary resulting in a lower frequency. I've rebuilt other IF transformers and reinstalled them and once aligned worked fine.
Any ideas?