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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 2:40 pm 
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Location: La Quinta, CA
easyrider8 wrote:
Here is a link to the inexpensive cartridges on ebay.
http://www.ebay.com/itm/Turntable-Phono ... 1842022084

Dave


Thanks Dave. How do I modify this 4 prong for use on my mono 78 phono?

Jeff


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 3:18 pm 
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Location: Long Island NY
You arent listening Jeff..
Those will NOT work...

Do you care about originality?
If not then use a Pfanstiehl P-51-3.. It will work but you will need to add a spring in the back to lighten it up.. (Chris Cuffs recommendation)

For originality, you will have to be very delicate. I broke 3 crystals doing rebuilds in the beginning... They are super fragile...
Here is the how to: Follow it exactly...

http://philcoradio.com/phorum/showthread.php?tid=1019

Kirk

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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 4:20 pm 
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Location: La Quinta, CA
OldRestorer wrote:
You arent listening Jeff..
Those will NOT work...

Do you care about originality?
If not then use a Pfanstiehl P-51-3.. It will work but you will need to add a spring in the back to lighten it up.. (Chris Cuffs recommendation)

For originality, you will have to be very delicate. I broke 3 crystals doing rebuilds in the beginning... They are super fragile...
Here is the how to: Follow it exactly...

http://philcoradio.com/phorum/showthread.php?tid=1019

Kirk



Are you saying that the cartridge Dave is recommending cant be used for parts to repair my original one? The Astatic L26. I would definitely like to keep it as original as possible.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 6:49 pm 
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The L26 is a 1.4 V cartridge. The one you are thinking about buying is less than half the voltage.
It will work but your volume will be low. If you want original then you have to rebuild your cartridge and you can find a 1.4 V crystal cartridge replacement to use as a donor from the voice of music website or eBay.

To use a four prong cartridge you have to twist the leads of the two top terminals and the two bottom terminals to make two terminals.

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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 7:48 pm 
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The cartridges I use are Electro-voice EV88's...
They are available from thevoiceofmusic.com.
Gary is the cheapest I have found...

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I restore old things.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 8:04 pm 
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Old Radioz wrote:
You can buy ceramic stereo cartridges on eBay for 2$ each, shipping included!

I bought two to rebuild some of my cartridges (I haven't touched a radio and phono in eons,
thanks to a collegue at work, I restored a phono and soon another nice Rogers radio for him).

These ceramic cartridges are just enough to rebuild cartridges for 45 players (about 1.2v)
a some Astatic and similar heavy 1.2V cartridges (I could share a list).
I've seen a seller offering a similar cartridge with an adapter to fit into 45 player for 45$!
With a bit of ingenuity, anyone can do it for about 2-3$...

Heck, at two dollars a pop, yielding two ceramic elements allowing for two cartridges rebuild, anyone can afford it
even for a learning purpose.

I can share an eBay link to those cartridges or search by yourself. Let me know.

Syl


FStephenMasek wrote:
Where do you find real crystals?


YES PLEASE! I for one would like to know what cartridge that you are using to do this!!

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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 9:35 pm 
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$24 + shipping.
And pray it does not self destruct.

Bless those that can accomplish this. I for one would not attempt it.

I like the old style 51-1,51-2. and 51-3 cartridges. They have since changed the body style.
The -3 is for 78 Stylus.
There is someone on e-bay selling the old style for $39.99
http://www.ebay.com/itm/Astatic-51-1-AM ... XQO21RoLR~

Last week he was asking $49.99

New Body Style
http://www.ebay.com/itm/ASTATIC-P-51-1- ... SwYlJW6mIS

I have them in the Philco Bing Crosby 46-1201 Phono's and they sound AWESOME.

I have a bunch of the old original Metal Cartridges from 40's. Syl rebuilt a couple for me when he was in the hobby. He was the only one that really rebuilt them with 3V + in output.

Bob T


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Tue 20, 2016 10:40 pm 
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Yup,
I get then in 5 packs from Gary... The EV-88 is the perfect donor but as I said.. I wasted 3 of them while learning...

I will change my opinion Jeff.. If the ceramic is 1.4 then it "COULD" replace yours. Does your player have a pre-amp or is the chassis a 2-3 tuber?
They will use a cart with less voltage. I assumed yours was a 3v cart from the info in the original post. Try the ceramic and see what happens.

If you really want original like you said then find a similar voltage crystal cart and rebuild it..

Kirk

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I restore old things.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Wed 21, 2016 4:20 am 
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Location: La Quinta, CA
OldRestorer wrote:
Yup,
I get then in 5 packs from Gary... The EV-88 is the perfect donor but as I said.. I wasted 3 of them while learning...

I will change my opinion Jeff.. If the ceramic is 1.4 then it "COULD" replace yours. Does your player have a pre-amp or is the chassis a 2-3 tuber?
They will use a cart with less voltage. I assumed yours was a 3v cart from the info in the original post. Try the ceramic and see what happens.

If you really want original like you said then find a similar voltage crystal cart and rebuild it..

Kirk



I need the cartridge, or the crystal, and the knowledge on how to do the replacement, for a Zenith 5R086 phono with a built-in 5C04 AM chassis. I ordered several of the little piezo elements, but after reading most of the guys comments, suspect that might be a waste of time. I then read the extensive Forum, with photos, on how to replace an original crystal into my cartridge. This is obviously a better way to do things. Ideally, I would like to find an inexpensive source for the crystals.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Wed 21, 2016 12:04 pm 
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That is the main issue,
If you look on this forum, I have done 3 different Piezo crystal experiments and videos.
I actually found a company that will make me the crystals but it is $5000.00.
I tried to raise money but got no interest. The only other issue is that they are just the raw crystal pieces.
You would have to add wires...

I tried for weeks to grow my own crystals and did experiments on here for that too.

The thing I found is that it is easiest to just buy the carts and use the donor crystals...

Search my username and piezo....

Kirk

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I restore old things.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Sun 25, 2016 3:17 am 
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Joined: Jun Mon 24, 2013 3:00 pm
Posts: 828
Location: Champaign IL 61822
I tried rebuilding a cartridge with the Radio Shack element.

It works fine in my RCA U-10 radio/phono, which has it feeding a
6SQ7 - 6F6 amplifier. Its not enough out for
a one-stage.

The key is getting the element to bend properly with side-to-side motion of
the needle. This means it mounts from the needle to the side, not
back, of the holder. My element was about 3/16 x 3/32 inch and
was attached with hot glue.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Sun 25, 2016 1:24 pm 
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Of course an element is better in a player with an amp. With a one tuber it will have to be a quiet room for you to enjoy the record...

Kirk

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I restore old things.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Sep Thu 29, 2016 2:13 pm 
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Joined: Jun Mon 24, 2013 3:00 pm
Posts: 828
Location: Champaign IL 61822
dtvmcdonald wrote:
I tried rebuilding a cartridge with the Radio Shack element.

It works fine in my RCA U-10 radio/phono, which has it feeding a
6SQ7 - 6F6 amplifier. Its not enough out for
a one-stage.

The key is getting the element to bend properly with side-to-side motion of
the needle. This means it mounts from the needle to the side, not
back, of the holder. My element was about 3/16 x 3/32 inch and
was attached with hot glue.


I got mad last night at the hum and buzz in this set and worked on it.
The hum was fixed by adding a 47 uF cap and 50 Ohm resistor before
the first "native" filter cap. The buzz was fixed by putting the wires
to the in-off switch in shrink-wrap tubing and wrapping it with aluminum sticky tape and grounding the tape (with several turns of copper wire wrapped around it ).

I never liked the frequency response of this thing on phone so I tried
removing the series 0.015uF cap and 8200 Ohm resistor across the pickup.
This fixed it ... now the tone control offers three difference responses,
whereas before the two "higher frequency stronger" ones were
indistinguishable. The middle one now seems best. This also changed the
usual position of the volume control from 3/4 up to 1/4 up.

Doug


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Oct Sat 01, 2016 11:45 pm 
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Joined: Jul Sat 23, 2016 6:58 am
Posts: 358
Location: La Quinta, CA
OldRestorer wrote:
Yup,
I get then in 5 packs from Gary... The EV-88 is the perfect donor but as I said.. I wasted 3 of them while learning...

I will change my opinion Jeff.. If the ceramic is 1.4 then it "COULD" replace yours. Does your player have a pre-amp or is the chassis a 2-3 tuber?
They will use a cart with less voltage. I assumed yours was a 3v cart from the info in the original post. Try the ceramic and see what happens.

If you really want original like you said then find a similar voltage crystal cart and rebuild it..

Kirk



Kirk....is this the element I should experiment with?


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Oct Sat 01, 2016 11:54 pm 
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Location: La Quinta, CA
Also, can anyone identify this cartridge, which also appears to not be working? GE model 12 phono.

Jeff


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Oct Sun 02, 2016 2:32 pm 
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Location: Mount Arlington, NJ 07856
By the looks of the two coils in front, I'd say it is a moving magnet type, not crystal type. (Perhaps you already know this.) Have you tried to measure the resistance across the terminals?


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Oct Sun 02, 2016 4:35 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2478
Location: Haledon NJ USA
That's an early version of a GE Variable Reluctance cartridge. As I remember, they put out about 10mv. This early version tracks heavier than the later ones and is designed to play 78 RPM records only.

There's a thread about one here:
viewtopic.php?f=9&t=308164


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Oct Sun 02, 2016 6:06 pm 
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Joined: Jul Sat 23, 2016 6:58 am
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Location: La Quinta, CA
tunerman wrote:
By the looks of the two coils in front, I'd say it is a moving magnet type, not crystal type. (Perhaps you already know this.) Have you tried to measure the resistance across the terminals?


It measures 0.28 ohms. There is correct continuity from the cartridge to the RCA plug, but no hum when I touch the needle or wires. Tubes light up, and motor turns.


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Oct Sun 02, 2016 6:07 pm 
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Joined: Jul Sat 23, 2016 6:58 am
Posts: 358
Location: La Quinta, CA
Ken Doyle wrote:
That's an early version of a GE Variable Reluctance cartridge. As I remember, they put out about 10mv. This early version tracks heavier than the later ones and is designed to play 78 RPM records only.

There's a thread about one here:
viewtopic.php?f=9&t=308164


Ken,

Do you have any information on replacement for rebuilding of the cartridge?

Jeff


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 Post subject: Re: Rebuilding Crystal Cartridge
PostPosted: Oct Sun 02, 2016 6:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2478
Location: Haledon NJ USA
The stylus is not meant to be user replaceable, as it's soldered in place. Aside from the stylus wearing out, the only thing that usually goes bad on these is the rubber block under the stylus cantilever hardens with age.

These cartridges are often replaced with the slightly newer GE RPX series which have replaceable styli.


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