For sale is a classic Vintage original Crown IC-150 Pre-Amp with beautiful wood case for sale, here is an old review of this very very nice classic pre-amp
"The Crown IC 150 was a state-of-the-art preamplifier when it came out in 1971. It offered an unheard of level transparency due to its ultra-low noise levels.
This is a top-quality American-made preamplifier, listing for the equivalent of over $1,500 when new.
Crown calls this an Integrated Circuit Stereo Console because in its day, integrated circuits were the height of technology. Preamplifiers were often called consoles, as just like a broadcast console, because they are the control center for your entire home entertainment system.
Before you write this off as a goof, as anyone who can read a schematic will see (and contrary to the flowery press at the time), the IC 150 is an almost entirely passive preamp!
The IC 150 has an entirely passive input selector and tape monitor and recording system. The volume control and loudness compensation circuits are entirely passive. The Balance and Panorama controls are completely passive. Even the HIGH and LOW filters are completely passive. To get 12 dB/octave for the passive HIGH filter, the IC 150 uses one inductor in each channel to make a classic LC filter.
The advantage of passive circuits is that they add no distortion and no noise, and have unlimited dynamic range and output level.
The only active circuitry in the entire line-level audio path is a single LM301AN operational amplifier in each channel, which provides 20 dB of gain. The tone controls work in the feedback loop of this one op-amp. This simplicity is how Crown got this to work and sound so well.
How simple is it? Even with the phono preamp and all the relays and other control logic and power light, the entire preamp draws only an actual measured 2.7 watts from the wall — less power when ON than most modern HiFi gear wastes while it's off!
Each single op-amp is an 8-pin DIP with a socket.
The tone controls have separate left and right adjustments, popular back in the day. With mono records still in most people's collections, we boosted the bass and cut the treble on the right, and boosted the treble and cut the bass on the left, to simulate stereo. This put the violins on the left and the basses on the right.
The separate phono preamp board, mounted right at the phono input connectors, has several discrete transistors. It's also a gem, using 1% resistors and 2.5% capacitors for precise adherence to the RIAA curve. It also has rear-panel adjustable gain for each channel from 30 ~ 50 dB so your turntable's level and balance can match your other components.
It runs from regulated ± 18V supplies giving this Crown an output of 11.7 V RMS of hot, clean audio, not the wimpier ± 15 V supplies more popular today that limit their output levels to about 8 V RMS.
This preamplifier is made to commercial standards, with G-10 glass epoxy circuit boards and a mu-metal shielded power transformer. Please review all the pictures and ask any questions before you purchase. This is sold as is as described no returns. If this is going to be shipped it will be packed up very very well with good padding to insure it comes to you in the exact condition as shown.
Input Impedance
100 kΩ.
Output Source Impedance
600 Ω.
Crown says the tape outputs are also 600Ω, but since they are just hard-wired from the inputs, they will be the same as the inputs.
Output Slew Rate
4.25 V/µS.
Size
3 RU (rack units) tall = 5.25".
5-1/4 x 17 x 8-1/8 HWD.
Weight
10 pounds.
Add 6 pounds for the beautiful walnut veneer case, 10" deep.
Quality
Hand-made in Elkhart, Indiana, USA.
Power
Power cord is flexible 2/16 heater cord.
Power switch rated 25 Amperes.
Switched outlets rated 1,200 watts.
2.7 watts, measured power consumption. 2 W rated.
1/8 A fuse (1/16 when set to 240 VAC).
0 watts when off.
Power light is red neon.
Price, USA
1971: $1,550 list price, corrected for inflation in 2015 ($269 list price at the time). Cabinet: $199 including inflation ($33 at the time).
1975: $1,525 list price, corrected for inflation in 2015 ($349 list price at the time)