Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Feb Sun 18, 2018 12:26 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 73 posts ]  Go to page Previous  1, 2, 3, 4
Author Message
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Mar Tue 07, 2017 4:27 am 
New Member

Joined: Mar Fri 03, 2017 7:19 pm
Posts: 9
kirk, I second the west tec thing, I need a crystal with 3 volt output for a reverb unit I am working on, crystals have a short life in the hot humid climate, I had the crystal rebuilt twice with the piezo elements but no good ,west tec was one of the rebuilders, what I need is a phono crystal like used in early 78 record players, the kind that looks like the crystal rebuild in the video. but need the 3 volt out put, mounting not a problem. all I need is for somebody to tell me what number or make crystal I am looking for. perhaps somebody can help. thanks , Frank


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Mar Tue 07, 2017 3:10 pm 
Member
User avatar

Joined: Dec Sun 01, 2013 4:10 pm
Posts: 6576
Location: Long Island NY
I sent you a message with all the info you need Frank.

:)

_________________
No, I am not old.
I restore old things.


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Nov Sat 25, 2017 8:02 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3781
Location: WI 54812
OK, I'm a phono cartridge dummy. Would it work to wire one of those dual element cartridges in series for a hotter mono output, given you get the phase correct?


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Nov Sat 25, 2017 11:20 pm 
Member
User avatar

Joined: Aug Fri 09, 2013 1:01 am
Posts: 458
Location: Mount Arlington, NJ 07856
No, I kind of doubt that. The typical magnetic phono cartridge has about a 4 millivolt output. Double that and you have 8 millivolts. Nowhere near 3 volts.


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Nov Sun 26, 2017 12:30 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 12432
Location: Omak,wa,usa
Hello guys
this is something I have been putting off working on my phonos rebuilding them
anyway I ordered a few of those cheap ones from ebay but rebuilding them is a whole new thing for me I am like kevin :)
sincerely Rich


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Nov Sun 26, 2017 2:31 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3781
Location: WI 54812
tunerman wrote:
No, I kind of doubt that. The typical magnetic phono cartridge has about a 4 millivolt output. Double that and you have 8 millivolts. Nowhere near 3 volts.


I was under the impression they were stereo ceramic and 1.5v output?


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Nov Mon 27, 2017 2:20 am 
Member
User avatar

Joined: Aug Fri 09, 2013 1:01 am
Posts: 458
Location: Mount Arlington, NJ 07856
Oh, right. I was thinking magnetic cartridge for some reason. Perhaps that might work for mono recordings as mentioned. If there's any phase difference between the stereo channels, that might throw things off a bit. It would be an interesting experiment anyway. I just got rid of the only stereo ceramic turntable I had so no can try. :?


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Dec Thu 28, 2017 9:33 pm 
Member

Joined: May Fri 15, 2015 4:33 am
Posts: 260
Enthused by the idea of using cheap ceramic carts to refurbish old crystal ones, I spent a whopping $14.50 for ten carts from China. Shipping was included.
I had been working on a Webcor Lark - a one tube wonder from the 50's. The only ID on it is on the schematic, which states it is Model B135-1, B1035-1, F135-1 or F1035-1.
Originally I had replaced the old Astatic cart with a KCCA replacement kit, and it sounded OK, but I had problems getting the tone arm weight correct.
My Chinese carts arrived a few days ago, and using the ceramic carcass from one, I rebuilt the old one. After one or two teething problems, I have got it working, but the volume is very low. I am wondering if the problem lies in how I assembled the cart or whether I need to do anything to the amp?. In assembling the cart I used small amounts of RTV silicone to stick the parts together and give the thing some degree of flexibility.
Here is a pic of the cart, and also the schematic.

Bob


Attachments:
IMG_3071.jpg
IMG_3071.jpg [ 70.01 KiB | Viewed 251 times ]
IMG_3075 2.jpg
IMG_3075 2.jpg [ 135.07 KiB | Viewed 251 times ]
Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Dec Thu 28, 2017 11:10 pm 
Member
User avatar

Joined: Dec Sun 01, 2013 4:10 pm
Posts: 6576
Location: Long Island NY
It is the crystal. It is only .75 volts or so. Nothing close to the 3v you need to power these amps. A preamp is the only other route..
Buy an EV-88 or some other 3v crystal cart for the donor. I rebuild all mine with these 3v carts and mine work very well. They are $25.00 each though.

Kirk

_________________
No, I am not old.
I restore old things.


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Dec Thu 28, 2017 11:49 pm 
Member

Joined: May Fri 15, 2015 4:33 am
Posts: 260
Quote:

Post subject: Re: Rebuilding Crystal CartridgePostPosted: Oct Sat 22, 2016 11:47 pm

The results of putting a $1.79 dual ceramic cartridge internals into the Astatic L26 cartridge were surprisingly good. The tone is almost as good as a new pfanstiehl P 51-3. The volume is decent. Not as good as the P51-3, but a very inexpensive fix, which keeps the player visibly accurate.

Jeff



Aha! I got the impression from the above that it might just work - certainly it tracks correctly. Although that is not of great use if one can't hear the darn thing properly.

Bob


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Dec Fri 29, 2017 2:07 am 
Member

Joined: May Fri 15, 2015 4:33 am
Posts: 260
Quote:
Post subject: Re: Rebuilding Crystal CartridgePostPosted: Nov Sun 26, 2017 2:31 am
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3780
Location: WI 54812
tunerman wrote:
No, I kind of doubt that. The typical magnetic phono cartridge has about a 4 millivolt output. Double that and you have 8 millivolts. Nowhere near 3 volts.



Quote:
I was under the impression they were stereo ceramic and 1.5v output?



Guess before I either build a pre amp, or reinstall the KRCC kit, my question is are the ceramic carts from China really 1.5V ? And if so, I wonder why my sound is so low. Surely at 1.5V it should be halfway to 3V? In other words, at least 50% of 'normal' volume? How does one ascertain the voltage of a cartridge?

Bob


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Dec Fri 29, 2017 4:51 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4039
Location: Boston, MA USA
I thought the Chinese ceramic cartridges were 350mV. That's why they track relatively well.

-David


Top
 Profile  
 
 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Dec Fri 29, 2017 5:24 pm 
Member

Joined: May Fri 15, 2015 4:33 am
Posts: 260
Quote:
I thought the Chinese ceramic cartridges were 350mV. That's why they track relatively well.

-David


.35 V is less than a quarter of 1.5V, and less than an eighth of 3V so that explains the low volume!

How does one measure the voltage of a cartridge when it is just lying on there bench?

Bob


Top
 Profile  
 
Post New Topic Post Reply  [ 73 posts ]  Moderator: Alan Voorhees Go to page Previous  1, 2, 3, 4

All times are UTC [ DST ]


Who is online

Users browsing this forum: Pbpix and 7 guests



Search for:
Jump to:  






















Privacy Policy :: Powered by phpBB