davideck, you are just saying that to demonstrate the FULL ability of the Toshiba's TBC, I need to turn off the JVC's....correct?
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I am saying that in order to verify ANY timebase correction capability of the XS34, the JVC TBC/DNR must be off. Otherwise, the JVC TBC will output stable sync such that no additional timebase correction is possible.
Timebase correction, frame synchronization, and MV removal are all independent operations. A particular TBC device may or may not provide frame synchronization. A particular frame synchronizer device may or may not provide timebase correction. Either device may or may not provide MV removal.
The JVC TBC/DNR is a good TBC with no frame synchronization or MV removal.
The XS34 provides timebase correction and frame synchronization but not MV removal.
The TBC-1000 provides frame synchronization and MV removal, but little if any timebase correction.
Originally Posted by davideck
Using the JVC TBC/DNR will prevent the Toshiba from performing any additional timebase correction, but that should not mess up anything. The Toshiba will just see a more stable signal with the JVC TBC/DNR than it would otherwise see without. Use whatever looks best on a tape by tape basis.
For some tapes, the JVC TBC/DNR may perform better than the Toshiba TBC. I've also had tapes where my JVC 7600 TBC/DNR jitters vertically, while another VCR plays back fine. In that case, its better not to use the JVC TBC/DNR.
Its nice to have TBC capability in the DVD Recorder because it benefits all VCRs without TBCs, including Beta and 8mm machines.