JRC Receiver NRD-515 + NDH-518 Excellent Working Condition, Beautiful Item

This is a set of the JRC receiver NRD-515 and the memory unit NDH-518.
This is a one-owner unit that I purchased some time ago and have cherished and used for a long time.
It has been regularly maintained and frequency calibrated, is in good working order, and is a rare, beautiful item.
Currently, there are almost no crackles or contact failures with the switches or volume controls.

Below are some modifications and changes made.
Changes:
① The frequency display LED has been replaced with a green one that is easy on the eyes.
② The AUX crystal filter has been replaced with a custom-made 3KHz wide filter from Yakumo Tsushin (a company cooperating with Yaesu Musen) for Wide-SSB and Narrow-AM. Test results etc. are attached.
For this reason, a custom-made filter board is used.
③ All relays have been replaced with fully sealed types, the same as the later models, freeing them from contact failures.
④ Some deteriorated capacitors have been replaced.
⑤ A custom-made line filter has been added to the AC input.
⑥ An attenuator linked to the standby switch has been added to the antenna input to attenuate strong signals from the transmission monitor.
⑦ Both mechanical filters have been overhauled and are in good working order.

Accessories:
Instruction manuals (1 each), custom filter box and documents, catalog, original box.

I am listing this item because I am decluttering and hope someone will use it with care.

I believe it can still be used, but as it is an old item, it is being sold as is (junk).
No returns or complaints, please.

I would like to sell this to someone who understands and agrees to all of the above.