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If it is not a transformer power supply type chassis then disconnecting the CRT usually disconnects power from all(or many) of the tube heaters(there are workarounds for that though).
If it is a black and white set and you plan on working on others like it then getting a test CRT (5AXP4 and 8AXP4 are fairly common/universal types) would probably be a good investment(you can often get one for under 15$ on Ebay).
Last edited by Electronic M; 08-26-2012 at 02:17 AM.
Reason: add something
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