545/Repairs: Difference between revisions
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Vintage dave (talk | contribs) (Vertical amp fuse warning and fix) |
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==Vertical Amp Fuse== | |||
Late-production 545A adds F1054 to protect the delay line when a vertical amp output is shorted to ground. However, if the fuse opens, all twelve 6DK6's will fry due to screen grid overheating. This can be avoided by rerouting screen resistor R1218 so it's powered by F1054. The fuse and resistor mods can be retrofitted to any 541/543/545/541A/543A/545A. | |||
[[Category:Instrument repair reports]] | [[Category:Instrument repair reports]] | ||
Revision as of 13:10, 10 October 2021
Fan mounts
See also the general article on Fan mounts .
Ken Chorney says:
Just wanted to add an alternative supplier for replacement fan mounts for the Tektronix 545 oscilloscope fan. Digi-Key currently stocks two part numbers which fit and work perfectly: RPC1597-ND and EAR1345-ND. Both are 1/2" length (same as original) and both have 8-32 male threaded ends (same as original). Both are slightly smaller in diameter (0.4" vs. the 0.5" originals) but this does not affect their fit at all and likely does not affect their function appreciably. I have installed three of the RPC1597-ND standoffs in my 545 and they fit and work perfectly.
Vertical Amp Fuse
Late-production 545A adds F1054 to protect the delay line when a vertical amp output is shorted to ground. However, if the fuse opens, all twelve 6DK6's will fry due to screen grid overheating. This can be avoided by rerouting screen resistor R1218 so it's powered by F1054. The fuse and resistor mods can be retrofitted to any 541/543/545/541A/543A/545A.