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 Post subject: Coolest phono cartridge so far...
PostPosted: Mar Thu 01, 2007 1:51 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3008
Location: Québec!
And a nice challenge too...No room for error...


Image


Image


Image


Syl


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 Post subject:
PostPosted: Mar Thu 01, 2007 2:59 am 
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Joined: Jul Tue 11, 2006 3:56 am
Posts: 1342
Location: Philadelphia, PA
Hi Syl,

Had two of them, one in a Capehart Panamuse and one in a flipover changer model from 1946. They are variable resistance, I think refered to as strain relief. Unfortunately, the elements in mine were good but the stylus tips were worn. Originally, Capehart would sell a new one to replace the old one as the stylii were not replacable. By 1948, they offered a kit with a GE variable reluctance pickup in a new shell, and a one tube preamp to update them. Never saw a Panamuse (meaning drop changer) with the conversion but most of the N series 1946-7 turnover models had the conversion done.

The radio supplied high voltage to the pickup and a blocking cap coupled it to a 6J7 preamp.

Fred WA3KIO


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 Post subject:
PostPosted: Mar Thu 01, 2007 3:35 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3008
Location: Québec!
Fred Rice wrote:
Hi Syl,

Had two of them, one in a Capehart Panamuse and one in a flipover changer model from 1946. They are variable resistance, I think refered to as strain relief. Unfortunately, the elements in mine were good but the stylus tips were worn. Originally, Capehart would sell a new one to replace the old one as the stylii were not replacable. By 1948, they offered a kit with a GE variable reluctance pickup in a new shell, and a one tube preamp to update them. Never saw a Panamuse (meaning drop changer) with the conversion but most of the N series 1946-7 turnover models had the conversion done.

The radio supplied high voltage to the pickup and a blocking cap coupled it to a 6J7 preamp.

Fred WA3KIO


Yep, strain gauge all right. I'm trying to figure what are my options here. I am waiting for the phono schematic from the owner and I will work from there. This one has a good stylus but the strain gauge is shot. It will be a simple matter -somewhat- to convert into a crystal type. it will probably need a small mod to the premap though. I will still try to rebuld the cartridge as it should if possible (i need more data).

I suspect the conversion to a GE meant losing the beauty of the translucent shell. Pretty clever engineering stunt. IIRC, there was another very scarce cartridge using that technique. I'd have to look into the books for the name as I forget.

Syl


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 Post subject:
PostPosted: Mar Thu 01, 2007 4:43 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 15735
Location: ID 83301
HAY i have one of those .


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 Post subject:
PostPosted: Mar Fri 02, 2007 3:16 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3008
Location: Québec!
Ken G wrote:
HAY i have one of those .


Ken,

If you ever decide to part with it let me know. I'd like one in my display.

Syl


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 Post subject:
PostPosted: Mar Sun 04, 2007 2:46 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5065
Location: Ortonville, Michigan
That pickup was made by Pfanstiehl. It's a strain gage, that operates on a variable resistance as the pickup plays the groove modulation.

If you convert this to a crystal or ceramic, there will be voltage on it, so look out.

I once had one of the GE converted Capeharts, and it was hard to discern that the head had a different pickup in it. My postwar Capehart still has the strain gage head in it, but I think that I'm going to be forced into converting it to a GE.


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