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Kenwood TK-140U

Solid State Automatic AM/FM Stereo Receiver (1968)

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Kenwood TK-140U


Tuning range: FM, MW

Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 50kHz

Total harmonic distortion: 0.5%

Damping factor: 23

Input sensitivity: 2mV (MM), 150mV (line)

Signal to noise ratio: 63dB (MM), 70dB (line)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 16.5 x 5.25 x 14.25 inches

Weight: 31lbs

Year: 1968



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Reviewed Apr 26th, 2018 by dartinker

Kenwood TK 140 U was the least reliable piece of stereo equipment that I've ever owned. Had it back to Kenwood on warranty 13 times in the few years that I owned it. Finally junked it. UPS charges were eating me up. Look elsewhere!



re: TK-140U and TK140X

I just found this website and for a guy like me it's GREAT!

First about the Kenwood TK140u. This was a cost-reduced version of the TK140X that came out a year or two before. Most notable its the shrinking of the physical size and heat-sinking of the transistors that drive the output transistors. I didn't see any reference to the TK140X here, so when I get time, I'll have to submit info - I have a factory manual and owner's manual on it. I'll have to check some other manuals I have too to see if this site has them. The TK140X I bought new and still have and it's an excellent receiver.
FYI: From December 1966 to June 1969, I worked in a repair shop for a company that had two, very small, corner stores selling component stereos, with a total of about 15 employees. From late 1967 to June 1969 I was their only repair guy, and I wass part time, while going to school. The company was called Sound of the Northwest when I started there, and while there, name changed to Sound of Music, and today the same company is called Best Buy!
I'm retired now after many years of designing medical products and old audio stuff is one of my hobbies.
What I do need is a source for the pilot light bulbs - they look like a 3AG fuse - need some for a couple Marantz receivers I have too - anyone know where I can get these?

re: TK-140U and TK140X

I've bought multiple lamp kits from AMK Products. Product quality is very good and all kits purchased had correct quantities of necessary lamps. https://www.amkproducts.com/Marantz_lamps.asp They offer fuse lamps as a separate SKU. The company also offers face plates, feet, screws and similar restoration hardware. I never use LED retrofits, because the appearance is less than impressive and originality is one of my goals. Best of luck with your projects.

re: TK-140U and TK140X


I had the same problem with the 3AG bulbs. I tried LED’s, but they didn’t have that “warm” glow, so I put in a pair of 6V wheat grain bulbs that fit just where the fuse bulb goes. The original bulbs were 8 volts though, so the two series wheat grains glow kinda dull.

You could also get the original ones at:


but these are 12 volt.

Although they are both 50 watt amps, I found that my tk-140u doesn’t drive my pair of AR-8’s as well as the sherwood s-7310 does. Maybe the bias is off? The tk-140 goes into clipping and saturation long before the Sherwood does. I wonder if both amps are rated in RMS? I will have to check them out into a load, and see what actually comes out.

God Bless,


re: TK-140U and TK140X

Hi Sam and Dave,

Parts Express sells the fuse lamps in incadescent and LED flavors. They have 6, 8 and 12 volt varieties.



This website is not affiliated with or sponsored by Kenwood. To purchase TK-140U spares or accessories, please contact the company via their website or visit an authorised retailer.