Mcintosh "Mac 1900" vintage integrated stereo receiver/amplifier, $15.

The term 'integrated' tells me that this McIntosh unit not only receives audio signals like a tuner, but also amplifies them like an amplifier. Radio signals captured by an audio receiver must be greatly amplified before they can power a pair of speakers, which is why units that are just tuners require an amplifier before they're of any real use. So, this unit receives and amplifies the signal, so that you can plug your speakers right into the back of it. If this were only a tuner, you'd have to run the output into a separate amplifier, and plug your speakers into the amplifier.

I don't mean to beat this one to death, but despite how important what you just read really is, few people are aware of any of it!

Lesson one here is that the McIntosh name equals expensive, high end audio equipment. And like anything else of quality, it will have buyers all over it on eBay. Whenever you see a piece of audio equipment with McIntosh on it, you should make every effort to buy it because you have bidders at the ready.

As I'm always saying here at auctionbandits, I'm no expert on audio equipment. And since I'd have to be an audio expert to know from experience the value of every piece of audio gear I ran across out there, I need a few shortcuts. So, when it comes to sizing up an audio receover, I've learned to look for just few things, and if I find them, chances are good that the unit I'm looking at is probably costly. Ifs it well made? I know this may sound silly, but you'll rarely find cheapo components inside an expensive, well made chassis. Likewise, good quality components aren't usually stuffed into an ungainly, tacky case. Not a universal rule, but a good start.

Then I look for physical size. The expensive receivers are usually physically larger than the less desirable models.
Next, I look for weight. Expensive receivers handle more power than the cheaper ones. The power supplies and transformers required to handle all that power weigh a great deal.
I look for heat dissipating fins on the rear of the unit. You don't see these fins too often, but when you do see them, you know you've got a powerful unit on your hands. Running a lot of power through an amplifier produces a lot of heat. The more powerful units often employ aluminum cooling fins mounted on the rear of the receiver to help get rid of this heat.
I look for lots of knobs on the front and lots of connectors on the rear. Expensive units are usually bristling with knobs, sliders and buttons on the front, as well as plenty of connectors on the back for hooking up extra speakers, auxiliary components and everything else you can think of.

Obviously, this is not a hard and fast rule, because some of most valuable stuff nowadays is the vintage equipment with barely a knob and a switch on it. But in general, it's a good place to start. If you'd like an example that embodies all of these criteria, do an eBay search for a "Pioneer SX-1980." This monster was Pioneer's flagship unit back in the audio heyday of the 1970's and sells on eBay today for about $1000. This is by no means an exhaustive rundown, because the world of audio stuff you're likely to run across out there is just too immense to encapsulate it here. But each time I get an item of interest, I'll present it right here and detail for you everything I can. This will help you develop the thought patterns you need to develop to take advantage of the opportunities out there in the world! This tuner sold on eBay for $455.

Photo of McIntosh MAC 1900 stereo integrated tuner