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#1
02-21-2009, 08:30 PM
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philco turntable woas
Working on a philco L-1427-124 no audio orignally.
restored the amplifier circuit, whats wierd, it has power tubes only. no preamp on this amplifier. im guessing its a high gain high impedence crystal pickup? Anyway... after restoring the amp, verifying all wire connections, the amp works, but its got almost like a ground fault like noise in the speaker, and no audio comming through at all. Removed the turntable, and hooked the RCA connections to the amp into a CD player. buzz went away, however audio is extremely weak, which is probably normal since theres no pre-amp circuit. just a power stage, thats it. Anyway, does this mean the pickup is bad? it has 4 wires, stereo pickup, i cant get a reading on any pins between any pins in any direction. so im assuming its bad. If so, where can i get schematics or a new pickup for this unit? its sentimental. thanks. 
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#2
02-21-2009, 09:16 PM
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Those single tube amps without a preamp use a high output (around 3 volts) crystal cartridge. There is a very good chance that it's bad. The low output of the amp while connected to a CD player is normal. The CD player kicks out not over 1 volt output, which is not enough to drive the amplifier.
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#4
03-05-2009, 12:20 PM
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Try these folks. Get all the numbers off your Philco and off of the cartridge and contact them. Should be able to help.
Reece http://www.canadianastatic.com/
__________________
Reece Perfection is hard to reach with a screwdriver.
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#5
03-05-2009, 12:30 PM
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Only problem with getting the stylus cartridge out and read its numbers, is there is a little set-screw that goes inside of the flip handle, that flips the cartridge around, has 2 needles. one on each side, guess one does 78s, and the other does 33-45
I cant get the set screw out to remove the cart, i stripped it. dunno what to do now. hehe.
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#6
03-05-2009, 12:38 PM
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May have to go buy a fine drill bit and drill out the screw. The new cartridge will have the flipper knob and all, anyway.
Reece
__________________
Reece Perfection is hard to reach with a screwdriver.
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#7
03-05-2009, 12:47 PM
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Quote:
the whole cartridge flips around to play between 78 and 33/45 instead of just the needle. I havent seen one like that before. has needle installed on both sides of the cart. but ill try using a dremel. It also looks like I am going to have to re-grease everything. when the mechanics of the record changer kicks in, the turntable stops. I have to "push" the table while the mechanics are changing the record. othewise the table will stop spinning. once the mechanics get done, the table spins fine.
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#8
03-05-2009, 01:54 PM
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Quote:
They have a pretty good selection and if they don't have it, they can custom make a new wheel surface on your old one. Good Luck! Bob Last edited by Ampico-kid; 03-05-2009 at 02:02 PM.
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#10
03-05-2009, 07:36 PM
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You may be able to get the cartridge rebuilt and new needles installed at West-Tech Services in Ohio.
http://www.west-techservices.com/ He may be able to resurface your idler wheel too. --Bob
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#11
03-06-2009, 11:52 AM
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Another possibility: there may be a Ronette cartridge that will work here. They made some high-output cartridges that flipped over with needles on each side the way you described. Whichever cartridge vendor you choose may be able to cross-reference.
Reece
__________________
Reece Perfection is hard to reach with a screwdriver.
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