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L4-B Plate Tuning Capacitor
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Recently acquired a L4-B that had not been used in many years. Completed the usual mods in both pieces. When adjusting Plate Control Knob realized variable not always moving. Thinking May be old grease may be binding attempted to use some spray lubricant without much success. Where do I go from here?? Thanks, |
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Donald Go to??and buy a new veneer drive with the pointer. Works great easy to install. There was a recent article in Qst about this in March I think. Regards? Tim KD2SC
On Thursday, March 28, 2024 at 08:05:28 AM EDT, <kg2nv@...> wrote:
Recently acquired a L4-B that had not been used in many years. Completed the usual mods in both pieces. When adjusting Plate Control Knob realized variable not always moving. Thinking May be old grease may be binding attempted to use some spray lubricant without much success. Where do I go from here?? Thanks, |
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Donald, There could be several contributing factors here including but not limited to knob setscrew not tight, worn spot on the vernier drive, hardened lubricant in the vernier drive, drive coupling screws loose, capacitor tension adjustment (if present) too tight, lubricant on capacitor bearings hardened, etc. etc. ?A physical inspection might help. ?I've used replacement vernier drives from The Crystal Set Society. Please keep the group informed as to what you find. 73, Evan, ?K9SQG
On Thursday, March 28, 2024 at 08:05:23 AM EDT, kg2nv@... <kg2nv@...> wrote:
Recently acquired a L4-B that had not been used in many years. Completed the usual mods in both pieces. When adjusting Plate Control Knob realized variable not always moving. Thinking May be old grease may be binding attempted to use some spray lubricant without much success. Where do I go from here?? Thanks, |
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Check to see that the set screws on the knob and shaft couplers are tight and not slipping.
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On 3/28/2024 8:05 AM, kg2nv@... wrote:
Recently acquired a L4-B that had not been used in many years. Completed the usual mods in both pieces. When adjusting Plate Control Knob realized variable not always moving. Thinking May be old grease may be binding attempted to use some spray lubricant without much success. Where do I go from here? --
73 de Mike, W1NR THAT was the equation. EXISTENCE!... SURVIVAL... must cancel out... programming! - Ruk - |