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LK 5xx Variable Cap Plates

 

Rebuilding another LK cap here and another Plate Tuning cap with nasty pits and therefore....arcing. Any info to secure those rotor and stator plates appreciated.
Rich
k0zx
 

Rich-
I had same problem on LK800C.
Replaced the tune cap with a vac variable and turns counter, problem solved.
Don't know how much room there is to work in the 500 series, but?
it was easy in the 800.

Tom
K0SN

On Mon, Jan 22, 2024 at 7:38?AM Rich k0zx <k0zx.co@...> wrote:
Rebuilding another LK cap here and another Plate Tuning cap with nasty pits and therefore....arcing. Any info to secure those rotor and stator plates appreciated.
Rich
k0zx
 

Now that's a very adventuresome solution there, well done....unfortunately space is available only for this cap, so probably not the best for this 500. Tnx for the idea tho
rich?
 

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Can you just obtain a new capacitor from Ameritron and modify the shaft to fit.

I use the plate side air variable capacitor out of the al80b, which is also used in a couple other models. I remove the plastic phenolic shaft and cut off the now exposed spline . I then use a shaft coupler to extend the 1/4 shaft extending out of the capacitor.?

New capacitor is under 40 bucks?

I used to rebuild the capacitors years ago, set plate gaps and hi pot. Not worth it when a new one is so cheap. Even after replacing plates , you still could end up having an intermittent connection issue between the plate shaft and end plates.

I would add a nice 50 ohm series glitch in series with the plate b+ . I like the Kanthal type resistors. And a spark gap for the Newley replaced capacitor .?

73 Scott Kb1sel?

Amp guy llc
Amprepairguy.com
YouTube Amp repair guy
203-892-4119

On Jan 22, 2024, at 10:36 AM, Rich k0zx <k0zx.co@...> wrote:

?Now that's a very adventuresome solution there, well done....unfortunately space is available only for this cap, so probably not the best for this 500. Tnx for the idea tho
rich?

 

¿ªÔÆÌåÓý

Here¡¯s a video showing the mod?



Amp guy llc
Amprepairguy.com
YouTube Amp repair guy
203-892-4119

On Jan 22, 2024, at 11:04 AM, Amp Guy Llc <kb1sel@...> wrote:

?Can you just obtain a new capacitor from Ameritron and modify the shaft to fit.

I use the plate side air variable capacitor out of the al80b, which is also used in a couple other models. I remove the plastic phenolic shaft and cut off the now exposed spline . I then use a shaft coupler to extend the 1/4 shaft extending out of the capacitor.?

New capacitor is under 40 bucks?

I used to rebuild the capacitors years ago, set plate gaps and hi pot. Not worth it when a new one is so cheap. Even after replacing plates , you still could end up having an intermittent connection issue between the plate shaft and end plates.

I would add a nice 50 ohm series glitch in series with the plate b+ . I like the Kanthal type resistors. And a spark gap for the Newley replaced capacitor .?

73 Scott Kb1sel?

Amp guy llc
Amprepairguy.com
YouTube Amp repair guy
203-892-4119

On Jan 22, 2024, at 10:36 AM, Rich k0zx <k0zx.co@...> wrote:

?Now that's a very adventuresome solution there, well done....unfortunately space is available only for this cap, so probably not the best for this 500. Tnx for the idea tho
rich?

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