Phono motors
 

Any one need these? Warren

Phono motors (spring on shaft)
 

"WW" wrote in message
...
Any one need these? Warren

I don't need any (now) but was tossed back half a century when
I saw the coiled spring-like bushing on the motor's shafts. I think
when you bought a 50 cycle player you got a little package with
one of those springs to convert the player to 60 cycle.

OR, was it just the other way around?

Old Chief Lynn

Phono motors (spring on shaft)
 

Lynn wrote:

"WW" wrote in message
...
Any one need these? Warren

I don't need any (now) but was tossed back half a century when
I saw the coiled spring-like bushing on the motor's shafts. I think
when you bought a 50 cycle player you got a little package with
one of those springs to convert the player to 60 cycle.

OR, was it just the other way around?

Old Chief Lynn

Many motors have those normally. It's just a way to get the right size.
Note that the second motor, P1241826-1.jpg, only has the bushing on
the 78RPM step of the shaft. The 45 and 33 1/3 RPM steps are bare.

On 50Hz the motor would run slower so the shaft would have to be larger
to get the same turntable speed. The adapter would be used for 50Hz
operation.

--
Jim Mueller

To get my real email address, replace wrongname with dadoheadman.
Then replace nospam with fastmail. Lastly, replace com with us.

Phono motors (spring on shaft)
 

"Jim Mueller" wrote in message
...
Lynn wrote:

"WW" wrote in message
...
Any one need these? Warren

I don't need any (now) but was tossed back half a century when
I saw the coiled spring-like bushing on the motor's shafts. I think
when you bought a 50 cycle player you got a little package with
one of those springs to convert the player to 60 cycle.

OR, was it just the other way around?

Old Chief Lynn

Many motors have those normally. It's just a way to get the right size.
Note that the second motor, P1241826-1.jpg, only has the bushing on the
78RPM step of the shaft. The 45 and 33 1/3 RPM steps are bare.

On 50Hz the motor would run slower so the shaft would have to be larger to
get the same turntable speed. The adapter would be used for 50Hz
operation.

--
Jim Mueller

Right on! And I had forgotten about the 3 speed changers with a single speed
synchronous motor. My (our) first suitcase style player had such a motor.
The player is long gone, but still have a couple scratchy 33 1/3's... I
think
Bill Haley... Shake, Rattle & Roll?? is one.

Old Chief Lynn

Phono motors (spring on shaft)
 

Lynn wrote:

"Jim Mueller" wrote in message
...
Lynn wrote:

"WW" wrote in message
...
Any one need these? Warren

I don't need any (now) but was tossed back half a century when
I saw the coiled spring-like bushing on the motor's shafts. I think
when you bought a 50 cycle player you got a little package with
one of those springs to convert the player to 60 cycle.

OR, was it just the other way around?

Old Chief Lynn

Many motors have those normally. It's just a way to get the right
size. Note that the second motor, P1241826-1.jpg, only has the bushing
on the 78RPM step of the shaft. The 45 and 33 1/3 RPM steps are bare.

On 50Hz the motor would run slower so the shaft would have to be
larger to get the same turntable speed. The adapter would be used for
50Hz operation.

--
Jim Mueller

Right on! And I had forgotten about the 3 speed changers with a single
speed
synchronous motor. My (our) first suitcase style player had such a motor.
The player is long gone, but still have a couple scratchy 33 1/3's... I
think
Bill Haley... Shake, Rattle & Roll?? is one.

Old Chief Lynn

Actually, these aren't synchronous motors. They're induction motors.
The speed is mostly controlled by the power frequency but it isn't
absolutely locked to it. That's why you don't find motors like these in
high quality record players (or tape recorders, either).

--
Jim Mueller

To get my real email address, replace wrongname with dadoheadman.
Then replace nospam with fastmail. Lastly, replace com with us.

Phono motors (spring on shaft)
 

Actually, these aren't synchronous motors. They're induction motors. The
speed is mostly controlled by the power frequency but it isn't absolutely
locked to it. That's why you don't find motors like these in high quality
record players (or tape recorders, either).

Right again, Jim, I don't think I ever owned an audio device with a
synchronous
motor. In Vietnam I serviced and rebuilt tape decks that had some sort of
motors that had adjustable speed motors (brushless if I'm not mistaken)
that I adjusted while playing a "master" tape of a popular recording.
Most of the repairs were done by carefully honing out the grooves in
worn
pick-up and record heads. Probably not accepted practice, but, hey
it certainly put a lot of tape players back in business at the Danang
Airfield tape library back in service!

Old Chief Lynn

Phono motors (spring on shaft)
 

"Lynn" wrote in message
...
snip
Most of the repairs were done by carefully honing out the grooves in
worn
pick-up and record heads. Probably not accepted practice, but, hey
it certainly put a lot of tape players back in business at the Danang
Airfield tape library back in service!

Old Chief Lynn

Yes, what you call "honing" is a costly (and time-honoured) service call
"lapping". Many heads are unavailable, and this is a good way to kjeep
machines in service for much longer.