KLH Model 200 Vintage AM/FM Stereo

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Apparently very rare and also very cool mini system from KLH. 

From online reviews and forums this is widely considered the "Last Great Audio Product from KLH". Likely due to its very respectable 5WPC to 4" drivers in such a compact unit.

Perfect for a kitchen or den if you're lucky like we are to have great FM stations.

Features an included separate speaker for full stereo operation, plus an Aux/Tape RCA line-level input to connect a modern source like your PC or network streamer.

Working well and looking great!

KLH Model 200 Specifications
Tuner:
AM/FM

Rated Power Output:
5W + 5W
(RMS, Both Channels Driven, 4ohm/channel, 1kHz, 0.9 THD).

Tone Control Range:
±8dB, 100Hz (bass), 10kHz (treble)

FM Usable Sensitivity
14.5 dBf

FN Stereo Separation
30 dB at 1 kHz

Speaker - Each:
4" (100mm) diameter, 6ohm

Dimensions W x H x D:
Radio Unit:
12-1/8' x 5-7/8" x 8-1/2"

Right Channel Speaker Unit:
6" x 5-7/8" x 7-1/4"

Weight:
Radio Unit:
7 lbs. 4 oz

Right Channel Speaker Unit:
2 lbs. 12 oz

KLH Model 200 Vintage AM/FM Stereo (Table Top Radio) - Manual

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.