Pioneer SX-1000 TD Dead Ceramic Phono Input

[vortalexfan]

Originally Posted by Electronic M

I agree the schematic is a little off.

But as someone who took a Japanese language course I can say your explanation is slightly wrong. Their page order (as well as comic bubble and newspaper column order) is backwards from ours, but the characters in their words/sentences read left to right (when not arranged vertically which is still common). Over a century ago they used to read their words/sentences right to left, but I doubt retirement age guys were designing solid state amps in the 1970s.

OK, but I'm still thinking that the "51" was supposed to be "15" (and maybe instead of reading as mV it was supposed to read as 1.5 V, but either way its working fine now.

[zeno]

Lets look at a few cartridges.

Pickering V15-AT2 AKA Pickering grey. The most common magnetic
used in add on and built in TT's in the 70's.
Tracking 2-5 G
Output 4.4 mv
resp 20-20K

Tetra is almost imposable to nail down due to shear numbers
BUT outputs start at 100 mv & go over 300. Most are custom built for specific models, not for general add on TT's.

SO a ceramic has 20 times MORE ++ than mags. Thats why it has to have a switch, most likely on the back to make it work right.

73 Zeno
LFOD !

[vortalexfan]

Originally Posted by zeno

Lets look at a few cartridges.

Pickering V15-AT2 AKA Pickering grey. The most common magnetic
used in add on and built in TT's in the 70's.
Tracking 2-5 G
Output 4.4 mv
resp 20-20K

Tetra is almost imposable to nail down due to shear numbers
BUT outputs start at 100 mv & go over 300. Most are custom built for specific models, not for general add on TT's.

SO a ceramic has 20 times MORE ++ than mags. Thats why it has to have a switch, most likely on the back to make it work right.

73 Zeno
LFOD !

There Isn't though, that's the thing, and it came that way from the factory. I think the stereo might of been designed to automatically switch the input type according to the kind of audio it detected.

[jr_tech]

Originally Posted by zeno

SO a ceramic has 20 times MORE ++ than mags. Thats why it has to have a switch, most likely on the back to make it work right.

If I am reading the blurry schematic correctly, it appears that there is no “ceramic” switch, but instead, a separate set of input plugs for ceramic cartridges that feed one set of the magnetic cartridge inputs through voltage divider resistors to reduce the voltage level.

jr

[vortalexfan]

Originally Posted by jr_tech

If I am reading the blurry schematic correctly, it appears that there is no “ceramic” switch, but instead, a separate set of input plugs for ceramic cartridges that feed one set of the magnetic cartridge inputs through voltage divider resistors to reduce the voltage level.

jr

That's exactly What I was trying to say, but I wasn't sure how to word it.

And like I said, I apologize for the crappy quality of the Schematic because my receiver when it was given to me came with everything except the original paperwork (it came with the original box and packing materials but the original manuals didn't come with it unfortunately so I had to just download the manuals from HiFi Engine which the quality of the scans aren't that great (about as good of quality as the Rider's Scans on Nostalgia Air.)

[zeno]

Well other stereos I have seen had a SW on the back.
The other possability is a production change. You could contact
jordan pier on U-tube. He is as good as they come with audio.

IIRC you said a Zenith worked OK. Probably has much less output
than a tetrad. The 2-G carts were only used on Zenith rigs, not
ever seen on add ons or other brands. So the phono amp can be
what ever the designers want.

73 Zeno
LFOD !

[vortalexfan]

Originally Posted by zeno

Well other stereos I have seen had a SW on the back.
The other possability is a production change. You could contact
jordan pier on U-tube. He is as good as they come with audio.

IIRC you said a Zenith worked OK. Probably has much less output
than a tetrad. The 2-G carts were only used on Zenith rigs, not
ever seen on add ons or other brands. So the phono amp can be
what ever the designers want.

73 Zeno
LFOD !

Yes, like I said the Zenith Record Changer was one I had salvaged out of a Junk Console I picked up off the side of the road about a year ago and I had a buddy of mine build me a wooden plinth for it so I could use it as a stand alone unit.

[zeno]

Originally Posted by vortalexfan

Yes, like I said the Zenith Record Changer was one I had salvaged out of a Junk Console I picked up off the side of the road about a year ago and I had a buddy of mine build me a wooden plinth for it so I could use it as a stand alone unit.

Looked around the internet & the Zenith 2-G carts are well respected.
Said to be as good as many magnetics. AND 2-G aint much weight !
It is a ceramic cart. The other odd ball was RCA used a cart with a
tiny amp built in. Things were $$ in the day.

Try this link to find out more !
https://www.youtube.com/watch?v=dDVDJh77B5A

73 Zeno
LFOD !