A buddy bought a very clean SX-780 on Ebay, and it had a defective STK0050 that had already been changed once. I convinced him we should go with the discreet modules, and once I got them installed, they worked perfectly. After adjustments, I measured about 52 clean watts per channel into 8 ohms. The modules sound great too!

Nice work on a great receiver. The new discrete modules are a godsend as a replacement for the STK 0050 Darlington modules. They are reasonably priced and the build quality of them is excellent.

If he wants a forever receiver, I would have done a total recap. They are decades over their lifespan. Love those STK replacements.

I just had this done to my 780. It sounds great.

Excellent work! I've seen several of these STK transplant kits installed now; they seem very well made, durable, and serviceable. Another great, classic receiver prepped for a long run, your customer is most certainly happy with the results. Thank you for your time

Best audio amp I have ever heard was a pair of Leak TL50 tube amps. Fronted by point plus stereo pre amps. KT88 tubes/valves give soft clipping on even harmonics distortion. Gives out presence like a live music event! Of course you need decent sized speakers like Tannoy Westminster’s which can shift air! Many guitar players like even harmonics distortion i.e. Fender , Gibsons etc!

Nice job Joe !! If i find one of these ailing but clean,and can pick it up cheap, it's nice to know this is a worthy repair.

Great video. I would like to see a video on your light bulb load box. Could you do a video on it?

YOUR NEW SUSCRIBER 😃 love vintage gear Hi from Baja California MÉXICO 🇲🇽😊

Have a SX 780 that eventually will need the STK transplant done, but not until my SX 980 goes down and cannot be brought back to life.

Good job. The aftermarket STK0050s are actually not bad and seem to work well without blowing up, but it's nice to have an alternative.

Hi, very nice work. One suggestion. Make a lock for your spinning base. She spins very easy witch is good, but when you are making measures or soldering it should be lock and steady. Because if loose you can make a short or a bad join. Thank you for your videos.

Now I miss my lights on the front face. Think I am down to one bulb on the right side . I bought my sx780 new and its never been serviced. It plays reasonably well yet.

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STK sound pretty good for the most part, but I will take discreet output devices over these everyday.

I believe those are original power packs, The paint falling off is most likely age. Now if someone would remake the FM integrated circuits.

I had an Akai PA-W04 amp with similar STK 0050-II, and the paint came off too. It could have been that way from factory. Would these STK replacements work for a STK0070-II. So with the suffix II behind the number. He is selling them without the type 2 suffix

Hey joe could you provide a link or name of seller you got the discrete replacements from? I have found some on various places on eBay but they’re the ones you have to build yourself and I would rather get a set that are already made and done professionally like the ones in your video for my pioneer 780. If you could let me know I would appreciate it

good evening, I really like watching your videos, I really appreciate it, could you please tell me how to easily calculate the power of the amplifier According to RMS, as you showed in the video, 21rms is equal to 51 watts, or something like that, thank you very much for any explanation, All the best

Hi. Any video on the LX-690 Pioneer?. Mine lights up but no click/relay. I changed the stk0039 with no result. Humm....

The new STK modules look just like the modules xraytonyb designed.

Where can I buy these modules?

I had one brand new in 1980. I also had a Marantz 2216B. Guess which one I kept? The Marantz, pioneer is absolutely pure junk.