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


It is currently Dec Fri 06, 2019 1:10 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 4 posts ] 
Author Message
 Post subject: Mid 70s magnavox 347h runs slow.
PostPosted: Dec Mon 02, 2019 2:14 am 
New Member

Joined: Dec Mon 02, 2019 1:40 am
Posts: 2
So I've had this mid 70s cabinet for many years.
347h. Sticker under phonograph assy. Model w718/53/01
I think I have figured out what stylus needle it needs.
The biggest problem it has is that it runs slightly slow.32 1/4 rpm.
45 s run about 44 1/2.
There has to be an adjustment for the speed.
I've carefully cleaned and oiled everything that moves.
Everything works fine other wise.
Where/how is the speed adjustment?


Attachments:
20191130_134951.jpg
20191130_134951.jpg [ 488.69 KiB | Viewed 99 times ]
20191130_134940.jpg
20191130_134940.jpg [ 506.27 KiB | Viewed 99 times ]
20191129_161524.jpg
20191129_161524.jpg [ 688.51 KiB | Viewed 99 times ]
Top
 Profile  
 
 Post subject: Re: Mid 70s magnavox 347h runs slow.
PostPosted: Dec Mon 02, 2019 4:59 pm 
Member

Joined: Jan Wed 16, 2013 12:04 am
Posts: 1613
Location: 77001
Welcome to the Phono Forum.

1. No, there is not a speed adjustment.

1.a. A possible/probable cause of slow speed is a gummed-up
set of motor bearings.

The old grease will heat up and get very viscous, sometimes
to the point of stopping the rotor.
The motor will need removal and thorough cleaning.

1.b. Motor mount grommets may be worn, also

2. The rubber idler wheel which drives the turntable is getting
hardened/ glazed from age, and is slightly slipping.
Replacement would then be warranted.

3. The idler height contact on the motor pulley might be off.
You can visually see if the idler rim is centered on the 33.3 RPM
size of the stepped motor speed pulley. There is an adjustment
for that.

4. Lastly, after you remove the platter, make sure to clean the inside
of the platter rim with alcohol, and clean the contact edge of the idler wheel, also.

Report back with your findings after investigating above.

Hotwax


Top
 Profile  
 
 Post subject: Re: Mid 70s magnavox 347h runs slow.
PostPosted: Dec Tue 03, 2019 5:12 am 
New Member

Joined: Dec Mon 02, 2019 1:40 am
Posts: 2
Thank you. I will look at the items listed.
The drive wheel under the platter might well need replace.
It is cracked slightly.
Where would I get one?
Also the adjustment. The idle height pulley.
There is a threaded stud with a flat slot just above the idle qheel.?


Top
 Profile  
 
 Post subject: Re: Mid 70s magnavox 347h runs slow.
PostPosted: Dec Tue 03, 2019 3:29 pm 
Member

Joined: Jan Wed 16, 2013 12:04 am
Posts: 1613
Location: 77001
Danev2 wrote:
Thank you. I will look at the items listed.
The drive wheel under the platter might well need replace.
It is cracked slightly. Where would I get one?

Also the adjustment. The idler height pulley.
There is a threaded stud with a flat slot just above the idler wheel.?

1. New idler wheel from http://thevoiceofmusic.com/catalog/phon ... urrets.asp
Email Gary with your record changer model #.
You send in your old wheel for re-cycling, and then you receive the
new re-tired wheel.

2. Idler height is adjusted with that slotted bolt as you wrote.
Turn clockwise to raise the wheel & reverse to lower, per the
W800 service notes.

3. If you'd like the Magnavox service sheets, send me a PM
with your email. I believe the W800 sheets will work for your
W700 series for most uses.
Hotwax


Top
 Profile  
 
Post New Topic Post Reply  [ 4 posts ]  Moderator: Alan Voorhees

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB