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Slip plate is a good substitute for aquadag...It is just a paint on conductive coating so dag flaking is not an issue for an unrestored non-working set. (were the set run with flaking dag there is risk of the fallen flakes causing shorts on the chassis, and if the flaking leaves dag islands or disconnects the ground connections for the CRT that could be bad) Any competent TV restorer knows to handle dag issues before power up.
If your repairman has a color CRT test jig most of those can be configured to work with these chassis (mine lacked settings/adapter listings for my 21CT55, but I reverse engineered those). Just need to set the jig yoke impedance selector to the correct setting for tube sets, and make adapters for the CRT and yoke connectors. Dynamic convergence won't work on the jig, but that is not important during the bench portion of the restoration.
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