If anybody wants to try passive preamplification for not a lot of money, here's your chance. This is similar in operation to the passive pres from Tortuga Audio, but a lot less expensive. The unit is in very good condition, and is about as quiet as preamps get. The Tera Dak power supply was added separately. I'm asking $350.00 + shipping. I pay PayPal.

There is quite a bit of information on the internet about Lightspeed, but here's a little blurb from Stereophile:

George Hi-Fi Lightspeed Attenuator: $490 (Australian) $$$
Plain but superbly finished, the Lightspeed Attenuator from Australia is an optically operated passive preamp with one set each of RCA inputs and outputs. A wall-wart power supply or lithium-ion battery supply must be purchased separately. With the Lightspeed Attenuator in his system, ST heard greater transparency, openness, and transient articulation. “Puts your old active preamplifiers’ feet to the fire,” he snorts. “Can work if your interconnects are short, your power amp has enough gain, and your speakers are sufficiently sensitive. Worth having on hand!”

Back side.

Whew! That was close. Stop tempting me!