ANTIQUE-RADIO-LAB
Welcome, please log-in to participate in this (your) forum, by logging in you agree to abide by the rules of this forum. Until you make your FIRST Login and post, you cannot PM a Member.
ANTIQUE-RADIO-LAB

Antique Radio Forum for Collectors antique-radio-lab.forumotion.com
 
HomeHome  RegisterRegister  Log inLog in  FAQFAQ  PublicationsPublications  SearchSearch  

Share
 

 Pocket Transistor Radios- No Sound. & Osc. 3 tips

Go down 
AuthorMessage
FrankB
Moderator
Moderator
FrankB

Join date : 2010-11-22

Pocket Transistor Radios- No Sound. & Osc. 3 tips Empty
PostSubject: Pocket Transistor Radios- No Sound. & Osc. 3 tips   Pocket Transistor Radios- No Sound. & Osc. 3 tips Icon_minitimeMarch 21st 2019, 6:35 pm

When I first started servicing radios, longer than I care to think, I ran into a period of "Cheap imported pocket transistor radios"
 The symptom of all of them was "No Sound".
 Not one single radio had a bad speaker or output transistors.
 One had dirt on the earphone jack killing sound to the speaker.
 ALL the rest had the electrolytic cap. feeding the center terminal of the volume control open up.
 A signal tracer I designed & built made this a quick & easy diagnosis.

Hum or Oscillation in a battery radio.
Often there is an electrolytic across the battery . Sort of a "bypass cap".
 If it opens, it can cause the above problems. Unless you are aware if it, it can cause some nightmare problems in the sets.
 In addition to the above, if it turns leaky, you can drain a new battery in a few short hours.
 If the 'lytic capacitor "dead shorts" it can cause the battery to explode or cause a fire.

NOTE: This cap going bad was a common problem in remote controls.
 The usual customer complaint on this was "I just put a new battery in yesterday and it worked fine, but when I tried it this morning the remote was dead."

 Yeah, more than you ever wanted to know. 
Just wait until you burn your hand on a red hot battery...... Embarassed Shocked
Back to top Go down
 
Pocket Transistor Radios- No Sound. & Osc. 3 tips
Back to top 
Page 1 of 1
 Similar topics
-
» Gurgling noise after a new Radiator was fitted

Permissions in this forum:You cannot reply to topics in this forum
ANTIQUE-RADIO-LAB :: Radio Repair Bench :: Hints & Kinks-
Jump to: