[Hammarlund] SP-600JX14 problem - main tuning capacitor sync

[Bill Cotter]

Thanks, Al. I will remove the front panel and check the 
relationship between the dials, stop pin and three-screw slots.

73 Bill N4LG


At 10:34 AM 11/16/2024, AW wrote:
>Hi Bill,
>         It sounds like the previous owner didn't get the new 
> paper dials on properly, or didn't move the dial to correct the 
> error.  The dial has 3 slotted holes at it's center, and is held 
> on place by 3 screws thru a disc.  They can't be accessed unless 
> the panel is off, or at least possibly loosened and moved 
> back.  (I hope that makes sense.) There might be enough 
> adjustment available to get it right.
>         At the lower end of the band, the dial should indicate 
> zero on the logging scale, with the freq. dial right on the left 
> end of it's scale. And the stop pin on the stop.
>         Shouldn't have to (don't) mess with any gearing.
>         Take a look at Andy Moorer's instructions.  As he says, 
> re: the manual, "The instructions are often more confusing than 
> helpful.
>   <https://www.hammarlund.info/GearTrainAlignment.html>
>73,
>Al, W8UT
>
>
>
>On 11/16/2024 9:59 AM, Bill Cotter wrote:
>>Hello everyone,
>>I have a nice SP600JX14 I am restoring to work with my globe King 
>>500A transmitter. I have the RF deck and side porch recapped with 
>>0.01 600VDC disc ceramics and all out of tolerance resistors 
>>replaced. After reassembling the RF deck on the chassis, I 
>>noticed something strange.
>>When the main tuning dial is set to the bottom of the band and 
>>the logging scale is set to zero, the main tuning variable 
>>capacitor is not fully meshed. It is all but about 10-15 degrees 
>>meshed. The stop pin is resting against its stop, as expected. 
>>When I rotate the main tuning to the highest frequency, the dials 
>>do not reach the expected end point and the stop pin does not 
>>reach its stop. I assume the main tuning variable capacitor has 
>>reached its end point.
>>It appears that the main tuning variable capacitor is out of sync 
>>with the dial indicators. The previous owner refinished the front 
>>panel and applied new dial scales to the dial plates, but he 
>>never disturbed the gearing behind the dials.
>>Any thoughts on how to correct the not-fully-meshed main tuning 
>>capacitor problem? I have all the digital copies of manuals with 
>>gear set exploding diagrams and tear down/reassembly directions, 
>>but I haven't come across the synchronization procedure.
>>Thanks in advance.
>>73 Bill N4LG
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