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Tools for Vintage Electronics work ? - Page 2

post #16 of 20

SSidyEvelyn- Standard resistor color code== black=0--brown=1-red=2-orange=3-yellow=4-green=5-blue=6-violet=7-grey=8-white=9. Usually the percentage is slightly separate from the other colors. Standard banding is =3 bands--there are now 4 bands out[or more] Read from left to right.IE= brown /black/red= 1000 OHMS =brown=1-black=0-red[multipler] =2[digits -zeros   ]the last band in the 3 band system is the multiplier /same in 4 band. But in 4 band you count the first three bands separately  like= brown/black/black/brown=1000 OHMS-- brown=1-black=0-black=0-brown[multipler]=1[extra digit-zero ]  . 


Edited by duncan1 - 8/10/13 at 12:11pm
post #17 of 20
Quote:
Originally Posted by duncan1 View Post

Check for dry joints. check every resistor  for increase in value and change if more than 10%

 

Quote:
Originally Posted by ssidyEvelyn View Post

Check for dry joints. check every resistor  for increase in value and change if more than 10%

4.gif

 

Hmm ...

post #18 of 20

Tomb-Hmm?- You buy or are given an old amp particularly a tube one. that is 20/30/40 years old. You will find [from experience] that believe it or not  components age/fail .I have repaired 1000s over the years. and number one on the list is changing caps a 0.1 400V cap that transfers the signal between  stages from the plate to grid 1 is sure to be leaky and if you leave it and it gets worse no more tube. Also the 0.1UF  HT+ capacitor design in early amps left a lot to desire and were not up to modern spec.The same with old large carbon resistors carrying a good amount of current went HR and gave off so much noise that a simple noise generator could be built using one.It was very bad business policy to repair an amp/radio receiver by just changing one or two components -the customer would be back complaining in a few weeks as other components fail.--and take out BJTs/Tubes.Many resistors increased in value lowering the spec of the unit. If you don't like hard work then open the wallet and buy NEW.  

post #19 of 20

Are you for real or a programmed recording?

 

My post - if you had gone to the trouble to read - indicated ssidyEvelyn simply repeated a sentence from one of your earlier posts, then you proceeded to argue against it (your own statement!)

post #20 of 20

Hmm means nothing to me .It could mean anything I didnt argue against myself . I JUSTIFIED myself if you read it right.There is a difference. If you disagree say so and we can debate it but. Hmm doesnt say anything. 

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