05-12-2018, 06:10 PM
A couple of other points:
First, have you checked the value of those 220k resistors? perhaps the original had changed value and whoever replaced it (and created the dry joint!) couldn't be bothered to cut off the other end of the faulty one?
Second, you can make your posts much simpler and clearer - thus easier to understand - and save yourself a lot of unnecessary typing by observing these tips:
Anyone who can help you will know exactly what an EBC33 is and what its function is in this set. (It might be different if we were discussing a TV with several identical valves performing various functions in different parts of the set, but that obviously isn't the case here)
Use the correct designations for component values so that your mu F should be µF, although the greek letter mu is usually replaced by a lower case u, thus uF. Similarly 'meg' is simply M, meaning a million - be careful about the case as m means milli (one thousandth)!
Another Greek symbol you will encounter is omega: Ω but there isn't a lookalike character in the alphabet so it was traditionally typed in full: ohms. However, in recent years, it has been common to use R, so 270Ω = 270R.
Another modern convention is to use a single character for the multiplier and put it in place of the decimal point. Particularly useful if you are writing values down when the point might not always come out clearly!
Thus for resistors, you will see 2M7, 2k7 or 2R7 and for capacitors, 4u7, 4n7, or 4p7. You may not be familiar with the n which stands for nanofarad - 10^-9, but it saves an awful lot of noughts! I haven't got the service sheet you are using but I bet you'll find values like 0.001uF or 0.005uF. 1n and 5n are much simpler, although often written 1n0 and 5n0. You will find waxed paper capacitors labelled 0.1mfd or even 0.1MFD. Millifarad? Megafarad? No, everybody knew you couldn't make a one millifarad capacitor, let alone a one Megafarad one, so it just means just microfarad!
You might say that these markings broke the rules but they became standard practice before there were any 'rules'.
As I said, you will find capacitor values like the 0.005uF that has already been mentioned. Don't panic when you find they don't exist any more! Capacitor tolerances used to be so poor that values followed a simple 1, 2, 5, 10 sequence but things have improved over time and the E6 values in the tolerance table I linked to have replaced them so, today, you will use a 0.0047uF (or 4n7) to replace it.
First, have you checked the value of those 220k resistors? perhaps the original had changed value and whoever replaced it (and created the dry joint!) couldn't be bothered to cut off the other end of the faulty one?
Second, you can make your posts much simpler and clearer - thus easier to understand - and save yourself a lot of unnecessary typing by observing these tips:
Anyone who can help you will know exactly what an EBC33 is and what its function is in this set. (It might be different if we were discussing a TV with several identical valves performing various functions in different parts of the set, but that obviously isn't the case here)
Use the correct designations for component values so that your mu F should be µF, although the greek letter mu is usually replaced by a lower case u, thus uF. Similarly 'meg' is simply M, meaning a million - be careful about the case as m means milli (one thousandth)!
Another Greek symbol you will encounter is omega: Ω but there isn't a lookalike character in the alphabet so it was traditionally typed in full: ohms. However, in recent years, it has been common to use R, so 270Ω = 270R.
Another modern convention is to use a single character for the multiplier and put it in place of the decimal point. Particularly useful if you are writing values down when the point might not always come out clearly!
Thus for resistors, you will see 2M7, 2k7 or 2R7 and for capacitors, 4u7, 4n7, or 4p7. You may not be familiar with the n which stands for nanofarad - 10^-9, but it saves an awful lot of noughts! I haven't got the service sheet you are using but I bet you'll find values like 0.001uF or 0.005uF. 1n and 5n are much simpler, although often written 1n0 and 5n0. You will find waxed paper capacitors labelled 0.1mfd or even 0.1MFD. Millifarad? Megafarad? No, everybody knew you couldn't make a one millifarad capacitor, let alone a one Megafarad one, so it just means just microfarad!
You might say that these markings broke the rules but they became standard practice before there were any 'rules'.
As I said, you will find capacitor values like the 0.005uF that has already been mentioned. Don't panic when you find they don't exist any more! Capacitor tolerances used to be so poor that values followed a simple 1, 2, 5, 10 sequence but things have improved over time and the E6 values in the tolerance table I linked to have replaced them so, today, you will use a 0.0047uF (or 4n7) to replace it.
