Silvertone Phonograph Hums

View previous topic View next topic Go down

Silvertone Phonograph Hums

Post by John Maxson on Sat Mar 19, 2011 6:53 pm

I picked up a late '60's Silvertone 67 33006 portable phonograph. It makes a loud hum when turned on. It plays and the sound and volume is good but the hum is really loud. I replaced the tubes. It has 2 wax caps that are .25 MFD 200 VDC. Also a large barrel cap and some other smaller ones. I tried disconnecting the motor. I cleaned the unit and checked all connections. Could the caps be the culprit?

John Maxson
Member
Member

Number of posts : 42
Registration date : 2011-03-19

Back to top Go down

Re: Silvertone Phonograph Hums

Post by bill57 on Sat Mar 19, 2011 7:58 pm

I would say that it is probably the electrolytic filter capacitors causing the loud hum and they are probably in the large barrel. See if there are markings on it for the cap sizes. You really need to replace these first before turning it on any more.

bill57
Member
Member

Number of posts : 85
Age : 65
Registration date : 2009-01-21

Back to top Go down

Re: Silvertone Phonograph Hums

Post by Bill Cahill on Sat Mar 19, 2011 8:20 pm

You also need to replace the paper caps. Those 200 volt .25 mf caps are line caps, and, not high enough rating. You need to replace those with 630 volt caps.
As he said, the barrel is the electrolytic can. You need to replace those before you even consider plugging it abck in.
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4537
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Silvertone Phonograph Hums

Post by John Maxson on Sun Mar 20, 2011 7:32 pm

Is the large barrel cap one component, or are there more than one caps inside, and I should disassemble it? I have an electronics store in town and I can go with a shopping list. Can I post photos on this forum?

John Maxson
Member
Member

Number of posts : 42
Registration date : 2011-03-19

Back to top Go down

Re: Silvertone Phonograph Hums

Post by Bill Cahill on Sun Mar 20, 2011 10:01 pm

Usually, that can will have two, or, more capacitors in it.
Examples:

40 mfd 150wvdc
20 mfd 150wvdc
25 mfd 25wvdc
Or,
80 mfd 150wvdc
50 mfd 150wdc
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4537
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Silvertone Phonograph Hums

Post by John Maxson on Fri Mar 25, 2011 12:04 pm

The can is marked with the values:

20 mfd 150 VDC
20 mfd 125 VDC
80 mfd 150 VDC

John Maxson
Member
Member

Number of posts : 42
Registration date : 2011-03-19

Back to top Go down

Re: Silvertone Phonograph Hums

Post by John Maxson on Fri Mar 25, 2011 9:29 pm

I replaced these 5 caps, and there is only a slight humming left. It plays well. The needle is bent and does not sit in the holder very well, I will replace it. There are still 2 smaller caps that are far into the chassis, I can not read one of them but I will snip them out and replace them too.
The next issue will be the automatic changer, it is not working.

John Maxson
Member
Member

Number of posts : 42
Registration date : 2011-03-19

Back to top Go down

Re: Silvertone Phonograph Hums

Post by bill57 on Fri Mar 25, 2011 11:00 pm

Congratulations, John, on replacing the filter caps and bringing the phono back to life. Good luck on servicing the changer. I'm not real familiar with the 60's changers but it may have a rubber cam wheel like the older 40's and 50's changers. If it does the rubber is probably shot. Get everything lubed and see if you can get movement and go from there. Let us know how it goes.

bill57
Member
Member

Number of posts : 85
Age : 65
Registration date : 2009-01-21

Back to top Go down

Re: Silvertone Phonograph Hums

Post by John Maxson on Sat Mar 26, 2011 3:11 pm

I replaced the other two caps. It works well. The guy at the parts counter said that the cap was from 1970 as the code on it was 705. Did they still make wax caps in 1970?
The changer has a rubber coated cam. The cam is not getting activated to hit the platter splines. The rubber is in good shape. I brought a the best match for a needle but it it was too big for the Y holder. The sound is intermittent and if the needle lays just right it is ok.

John Maxson
Member
Member

Number of posts : 42
Registration date : 2011-03-19

Back to top Go down

Re: Silvertone Phonograph Hums

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum