Got it out finally. Not much quality control on fuse dimensions. Sample size of 4 varied from 0.251 to 0.2535. Size made a large difference in insertion/removal force required.
Replacement fuse blew instantly with a loud band, which is good news. Indicates probably a dead short very close to power input. Much easier to troubleshoot than an overload somewhere causing ticking.
John
KK6IL
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On 4/8/2022 7:44 AM, n4buq wrote:
The fuse holders in the 7704A are a bit like some that are used in older HP gear where the fuses are held plastic cylinders that that are attached to an outer housing. Removing the housing exposes the fuses and the ends can be readily pushed (or pulled) as needed; however, the IDs of those plastic cylinders are very close to the OD of the glass. Once a fuse is pushed in place, it can be pretty difficult to remove it from those small plastic cylinders. I think the plastic cylinders have shrunk just a bit over time which exacerbates the removal process.
Thanks,
Barry - N4BUQ
