remote control volume solution for Jolida 502B?

If I am interpretting your question correctly, your Jolida does NOT have it's own remote control to adjust volume and that's all you need - Yes?

In that case, you should consider a Placette Audio RVC that comes standard with a remote control, is very reasonably priced and EXCEEDINGLY transparent.

Another option would be a Bent Audio passive unit that uses a transformer to adjust volume instead of the Placette's Vishay resistors.

Both products are well-regarded, simple designs, and are supported by two of the most accommodating people in the biz. Each will build to your specifications and back their products for the long-haul.

I have a Placette Active Linestage on its way to me as we speak. I got it used right here on the 'goN, and am really looking forward to receiving it.

Hope that helps.
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that gear is way out of my price range. how about the creek ohb-10 or ohb-12? anybody used these?

Depends how handy you are, or whether you're willing to pay a tech, and drill a hole in the faceplate for a remote detector. I recently researched the issue of adding remote to a non-remote unit (preamp) and came up with two things. You can contact John at Bent Audio and buy a step motor from him that runs a DACT stepped attenuator. Have a technically qualified person swap the existing Jolida attenuator for the DACT with motor. Cost will be around $300 for parts. OR you can get a Alps motorized attenuator kit (with remote) from Cary (or other sources). If I remember correctly, the cost is around $250. The Alps would be equal or better than the existing attenuator in the Jolida, though the DACT is likely even better. You need to make sure that the impedence of the attenuators is the same as the one in the Jolida. Heck, there are lots of people doing Jolida mods - someone should jump on this and offer it as a mod!

Creek OBH-10 will work fine.Check the used ads here.