[TechAssist] Re: Sears antique radio, transformer problem

  • From: "KENNETH BARNES" <KENNYB928@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 13 Jan 2006 11:13:51 -0600

Jerry:  Thanks for the reply - I do know what you are talking about the 
impedance ohms.  I appreciate your input....  
    Kenny
  ----- Original Message ----- 
  From: J Silverman<mailto:greentron@xxxxxxx> 
  To: techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx> 
  Sent: Monday, January 09, 2006 7:52 PM
  Subject: [TechAssist] Re: Sears antique radio, transformer problem

  Not ohm meter ohms - impedance ohms! Impedance ohms are not easy to measure.
  Easiest way is to look it up in the transformer manufacturers catalog. Also
  the transformer has to have enough iron to handle the DC current without
  saturating. It needs big wire to have low ohm meter ohms in order to be
  efficient and send the power to the speaker instead of burning it up in the
  transformer.
  Jerry Silverman Greentron Inc
  Mail to: greentron@xxxxxxx<mailto:greentron@xxxxxxx>
  4 Newland Ave Greenville SC
  29609                864 232 3889
  ----- Original Message -----
  From: "KENNETH BARNES" <KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx>>
  To: <techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx>>
  Sent: Monday, January 09, 2006 5:22 PM
  Subject: [TechAssist] Re: Sears antique radio, transformer problem


  >   Russ:  Thanks for your reply.  I hooked another transformer in circuit -
  primary reads 175 ohms, secondary .7 ohms.  Speaker doesn't give good sound
  as you said.  Bad transf. is about 3 times larger than the one I subbed for
  and iron core is much larger in the bad transf.     Any ideas?    Thanks
  again.   Kenny
  >   ----- Original Message -----
  >   From: Hoyt's TV<mailto:hoytstv@xxxxxxxxxxx<mailto:hoytstv@xxxxxxxxxxx>>
  >   To: 
techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx>>
  >   Sent: Tuesday, January 03, 2006 2:12 PM
  >   Subject: [TechAssist] Re: Sears antique radio, transformer problem
  >
  >   You can figure it out by the type of output tube they both fit. Look
  them up
  >   in an RCA tube manual. I believe will tell you the output impedance for
  the
  >   tubes. Tubes weren't too fussy though, I think you could get by with
  most
  >   any output transformer for a radio of similar type. Likewise the tube
  won't
  >   care too much about using a 4 ohm speaker with an 8 ohm transformer.
  However
  >   your audiophile customer may go ballistic when those 25kc notes that
  he's
  >   accustomed to hearing crystal clear, become a little distorted.
  >
  >
  >   Russ Hoyt
  >   Hoyt's TV
  >   Exeter, NH
  >
  >
  >   ----- Original Message -----
  >   From: "KENNETH BARNES" 
<KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx>>>
  >   To: "techassist"
  
<techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx>>>
  >   Sent: Tuesday, January 03, 2006 12:07 PM
  >   Subject: [TechAssist] Re: Sears antique radio, transformer problem
  >
  >
  >   > Sears antique radio - Question:  A transformer mounted on the speaker
  is
  >   > open on the primary.  The secondary winding on the transformer is .5
  ohms.
  >   > The B+ feeding the transformer primary is 90 volts.  The speaker is
  3.6
  >   > ohms.  I have a good transf. from another speaker which is 8 ohms, the
  >   > secondary winding is .7 ohms, the primary winding is 175 ohms.  Can I
  use
  >   > this transformer in place of the bad one?     TIA            Kenny
  >   > Kenny Barnes TV
  >   > 928 S. Marshall St.
  >   > Boone IA 50036
  >   > 515 432 5250
  >   >
  
KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:K<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:K>
  ENNYB928@xxxxxxx<mailto:ENNYB928@xxxxxxx>>>
  >   >
  >


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