Uploaded June 2026 | Updated September 2026, 2 weeks ago
OK, this one really surprised me!
I’ve always wanted one of one of those Pioneers from the early 70s that had the special speaker plugs which you had to find on eBay because they never came with the receiver as the original owner lost them!
Here we are today - my wife and son picked this Pioneer QX-8000A up at a garage sale. And it was a fair price, not .10 on the dollar.
Upon power up the unit just wanted to work. One dial lamp display light out, tuning indicator light out and one of the four amp channels was not putting sound out.
After a cleanup and assessment, I figured out that there was a problem with the preamp and the outputs for all four channels were good.
Played this quite extensively as-is for a number of hours but wanted to get the one channel repaired and also prolong its life.
So I recapped the power supply, the entire tone board, phono stage, and (4) amp driver boards. I did not swap the audio path transistors, perhaps I should but it’s just works so well as is, I didn’t want to go to that next stage. The original amp outputs are good, and obviously, I will never replace original outputs in any receiver — they always are golden retrievers when cared for.
This is a low hour unit and I could tell because of the power supply and the lack of char marks. And I looked at some other YouTube videos as I always do and saw other others just like it, which looked a a little toasty so I knew this one was young.
Anyways, after adjusting the DC offset and bias, it’s works flawlessly.
When you turn off all four channels and go to two channel mode, you’re not actually bridging the amp, you’re just providing some extra power to the two speakers you are running.
This really feels like 50 W per channel. Pushing HPM-100 speakers really well tonight.
This is my fifth quad receiver in the collection and I think I’m going to continue getting more. A lot of people don’t like quad, but don’t realize that you can get a real feature packed nice receiver and run it in the two channel mode. And if a channel goes out, you always have a backup pair!!
Highly recommended you get one of these if you come across one, you can thank me later. This is a hell of a receiver. It’s my son‘s and not mine at this point, but I would say it’s in my top 10 favorite receivers in the family collection. It’s quite special.
Welcome to summer. We might be a couple weeks away, but I don’t care it started!
OK, this one really surprised me!
I’ve always wanted one of one of those Pioneers from the early 70s that had the special speaker plugs which you had to find on eBay because they never came with the receiver as the original owner lost them!
Here we are today - my wife and son picked this Pioneer QX-8000A up at a garage sale. And it was a fair price, not .10 on the dollar.
Upon power up the unit just wanted to work. One dial lamp display light out, tuning indicator light out and one of the four amp channels was not putting sound out.
After a cleanup and assessment, I figured out that there was a problem with the preamp and the outputs for all four channels were good.
Played this quite extensively as-is for a number of hours but wanted to get the one channel repaired and also prolong its life.
So I recapped the power supply, the entire tone board, phono stage, and (4) amp driver boards. I did not swap the audio path transistors, perhaps I should but it’s just works so well as is, I didn’t want to go to that next stage. The original amp outputs are good, and obviously, I will never replace original outputs in any receiver — they always are golden retrievers when cared for.
This is a low hour unit and I could tell because of the power supply and the lack of char marks. And I looked at some other YouTube videos as I always do and saw other others just like it, which looked a a little toasty so I knew this one was young.
Anyways, after adjusting the DC offset and bias, it’s works flawlessly.
When you turn off all four channels and go to two channel mode, you’re not actually bridging the amp, you’re just providing some extra power to the two speakers you are running.
This really feels like 50 W per channel. Pushing HPM-100 speakers really well tonight.
This is my fifth quad receiver in the collection and I think I’m going to continue getting more. A lot of people don’t like quad, but don’t realize that you can get a real feature packed nice receiver and run it in the two channel mode. And if a channel goes out, you always have a backup pair!!
Highly recommended you get one of these if you come across one, you can thank me later. This is a hell of a receiver. It’s my son‘s and not mine at this point, but I would say it’s in my top 10 favorite receivers in the family collection. It’s quite special.
Welcome to summer. We might be a couple weeks away, but I don’t care it started!
