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Pioneer CS-801 Restore

Swaler61

New Member
Hey all,

Found a pair these at a local Savers (similar to a Goodwill) a week or so ago, and have been working on getting them back into shape. I've really enjoyed working on them!

As far as the drivers, only one was fried, one of the horn tweeters. I rewound it myself, first time for that! Used about 5 feet of 42awg wire, and it seems to work fine.

The squawkers and woofers were fine, the woofers just needed new dust covers, as it looked like a toddler punched them in. o_O

The cabs were in pretty good shape overall, just did a very light sanding, stained over any scratches, and then added a coat of paste wax. Done.

Replaced all of the electrolytic caps in the crossovers with films. I'm a long-time fan of the use of film caps for cathode bypass caps in guitar amps, and have done a lot of reading about ESR differences for film vs electrolytics in general. For applications in the signal path, I generally prefer films.

Binding posts updated also, really like the new over the old.

To me, the tone of these is very clean and accurate, and they remind me of the Klipsch Heresy 2's a friend of mine had many years ago. Don't misread me here, I'm not claiming these are as good as Heresy's, but they again sure are reminding me of them! Like the Heresy, these have a 12" woofer, horn squawker and tweeter in a similar size in an acoustic suspension setup, so there you are.

I'm really liking the tone of them so far, and I have less than $150 into them. :rockon:

As I mentioned in another post, I'm interested in seeing the difference in the crossovers used in the 801a's for comparison, so if anyone runs across an 801a manual, would love to see it.

Thanks overall to this forum for past posts from others working on these, it has been helpful!

Scottie
 
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Pics??
Hey all,

Found a pair these at a local Savers (similar to a Goodwill) a week or so ago, and have been working on getting them back into shape. I've really enjoyed working on them!

As far as the drivers, only one was fried, one of the horn tweeters. I rewound it myself, first time for that! Used about 5 feet of 42awg wire, and it seems to work fine.

The squawkers and woofers were fine, the woofers just needed new dust covers, as it looked like a toddler punched them in. o_O

The cabs were in pretty good shape overall, just did a very light sanding, stained over any scratches, and then added a coat of paste wax. Done.

Replaced all of the electrolytic caps in the crossovers with films. I'm a long-time fan of the use of film caps for cathode bypass caps in guitar amps, and have done a lot of reading about ESR differences for film vs electrolytics in general. For applications in the signal path, I generally prefer films.

Binding posts updated also, really like the new over the old.

To me, the tone of these is very clean and accurate, and they remind me of the Klipsch Heresy 2's a friend of mine had many years ago. Don't misread me here, I'm not claiming these are as good as Heresy's, but they again sure are reminding me of them! Like the Heresy, these have a 12" woofer, horn squawker and tweeter in a similar size in an acoustic suspension setup, so there you are.

I'm really liking the tone of them so far, and I have less than $150 into them. :rockon:

As I mentioned in another post, I'm interested in seeing the difference in the crossovers used in the 801a's for comparison, so if anyone runs across an 801a manual, would love to see it.

Thanks overall to this forum for past posts from others working on these, it has been helpful!

Scottie
 
Sure, here you go...
upload_2023-3-25_8-28-6.jpeg
As they arrived at my door


upload_2023-3-25_8-30-7.jpeg
Disassembly, getting personal...


upload_2023-3-25_8-30-36.jpeg
Reconditioning the finish a little


upload_2023-3-25_8-32-0.jpeg
Reassembly


upload_2023-3-25_8-32-47.jpeg
Upgraded crossovers, stayed with the stock cap values, but used films

upload_2023-3-25_8-33-24.jpeg
New dust covers. These woofers appeared to have been completely doped over, cone and dust cover, probably to slow any airflow for damping ("acoustic suspension"). Was thinking to dope the new covers like the originals were, but they seem to seal and slow airflow pretty well already so I left them. The surrounds look like the cloth type, they look and sound fine, so leaving them as-is. Was nervous originally as there was some coil rub, but the old punched in covers were deforming the coil. As soon as I got the old dust covers off, coil rub went away.

Wads of purple goo on the grills cleaned off (jelly beans?), and might touch up the scratches on the cone this week. The toddlers that did this are probably grandparents by now, right?

Sorry, don't have any pics of the tweeter rewind portion, pretty tedious.

I have new grill cloth too, but haven't done that yet. Besides, as my new/vintage man-cave speakers, I like the looks of them without grills anyway!

Scottie
 
Nice!! I had some Pioneers similar to that model. One had a cone-in-the horn midrange (I forget which model) and another pair looked similar to yours, with the same compression driver horn midrange. I still have a spare set of midrange horns and drivers actually. They're really neat! I wouldn't mess with the woofer surrounds either. Mine had plenty of bass with the original fabric and seemed air tight when I pressed them in gently. Love the wood cabinets on those older Pioneers! I had some issues with the level controls on my set, but I didn't mess with them much. I ended up selling them with some other gear, although I probably should have kept them! Sweet find
 
Last edited:
Thanks for the input! Wasn't sure what to expect from them sound-wise, but so far they're working really well for me.

Yeah, these possibly don't have the bass that a lot of folks want, but what is impressing me most is the clarity that I'm hearing in the mids that I haven't heard in a long time. Some of this might be due to my 60+yo hearing that isn't what it once was, too. Music-wise I'm a 50-60s rock and roll guy, with some classic rock and metal thrown in and they work fine for me there. But I have an acoustic music and jazz trio side, too, and this is where these things are really bringing it home for me, hearing stuff I haven't heard in a long time! Maybe because I've never had any speakers with mid horns before? Or maybe just the new film caps... ;)

Scottie
 
Thanks for providing nice clear images!

Cell phone pics, but didn't seem like there were any size limits. On some forums I've had to edit each one down, but I just threw them on here, and no problems.

Hopefully something useful for future reference? Who knows...
 
I had some issues with the level controls on my set,

Quick mention: The switch contacts on these were pretty oxidized, I gently fed in strips of 600 grit paper to clean the contacts and finished them off with contact cleaner. These switches would have been a bit of a pain to unsolder and take apart for cleaning. One of the mid switches wasn't making contact at all, which is probably why, along with bad caps, these speakers were at a thrift store.

Another little thing I noticed, the faston type tab connectors on these are a metric size somewhere in between 3/16" and 1/4" (6mm, maybe?), and one of the originals was cracked and barely hanging on. I don't plan on taking these apart very often, might be a good time to just solder the wires directly and get rid of future points of failure.
 
Cell phone pics, but didn't seem like there were any size limits. On some forums I've had to edit each one down, but I just threw them on here, and no problems.

Hopefully something useful for future reference? Who knows...

That's what I was thinking, might help someone in the future.
 
Sure, here you go...
View attachment 2838870
As they arrived at my door


View attachment 2838876
Disassembly, getting personal...


View attachment 2838877
Reconditioning the finish a little


View attachment 2838879
Reassembly


View attachment 2838880
Upgraded crossovers, stayed with the stock cap values, but used films

View attachment 2838881
New dust covers. These woofers appeared to have been completely doped over, cone and dust cover, probably to slow any airflow for damping ("acoustic suspension"). Was thinking to dope the new covers like the originals were, but they seem to seal and slow airflow pretty well already so I left them. The surrounds look like the cloth type, they look and sound fine, so leaving them as-is. Was nervous originally as there was some coil rub, but the old punched in covers were deforming the coil. As soon as I got the old dust covers off, coil rub went away.

Wads of purple goo on the grills cleaned off (jelly beans?), and might touch up the scratches on the cone this week. The toddlers that did this are probably grandparents by now, right?

Sorry, don't have any pics of the tweeter rewind portion, pretty tedious.

I have new grill cloth too, but haven't done that yet. Besides, as my new/vintage man-cave speakers, I like the looks of them without grills anyway!

Scottie
I am thinking about buying some cabinets with the speakers stripped out of them. I wanted to see if I can locate the midrange and tweeters in sizes that will fit the factory openings. Do you know the sizes of the midrange and tweeter openings in these CS-801’s?
 
Modrod,

Sorry, haven't looked at this in a while, and I don't seem to get notifications.

Still need to know those dimensions?

Scottie
 
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