26-08-2015, 07:46 AM
I was struggling a bit with terminology in this thread. I think what you are calling a "ladder" is tag strip. There are various types but here's a picture of one type: http://creativity103.com/collections/Tec...al2620.jpg There is also tag board such as: http://www.brimal.co.uk/components/com_v...988106.jpg
Both tagstrip and tagboard are commonplace in sets that pre-date printed circuit boards. It was also common proactice to make a solid mechanical joint before soldering. This makes it hard to remove a component. Many of us will simply cut the lead of the old component and solder on the new one. We can debate the merits of making a mechancial joint - I usually hook the component lead into the tag but don't wind it round.
This reads strangely. When you say "volume pot" I think you mean the mains switch which is commonly combined with the pot. It's quite common to get an infinity reading even when the switch is closed. This is usually due to oxidation of the contacts. The low voltage of the meter won't punch through the oxidation. When you apply mains, even with a lamp limiter it usually works just fine. Though I've see some that need some Servisol and repeated switching on/off to get them to work.
Of course it's possible for the switch to fail completely. Sometimes it's possible to get a repalcement pot with switch, other times you may have to do transplant surgery and graft on a good switch from another pot. The last resort is to bypass the switch and rely on the mains switch on the wall. Not ideal but at least the set can work. It's a good idea to switch off at the wall anyway.
Both tagstrip and tagboard are commonplace in sets that pre-date printed circuit boards. It was also common proactice to make a solid mechanical joint before soldering. This makes it hard to remove a component. Many of us will simply cut the lead of the old component and solder on the new one. We can debate the merits of making a mechancial joint - I usually hook the component lead into the tag but don't wind it round.
Quote:First thing I find is the volume pot is kaput. Resistance was infinity between live and neutral so I feared the transformer primary was shot. It soon turned out there was actually no feed via the switch to the transformer and when I did locate the actual transformer primary leads, Ohms was about 40 R.
This reads strangely. When you say "volume pot" I think you mean the mains switch which is commonly combined with the pot. It's quite common to get an infinity reading even when the switch is closed. This is usually due to oxidation of the contacts. The low voltage of the meter won't punch through the oxidation. When you apply mains, even with a lamp limiter it usually works just fine. Though I've see some that need some Servisol and repeated switching on/off to get them to work.
Of course it's possible for the switch to fail completely. Sometimes it's possible to get a repalcement pot with switch, other times you may have to do transplant surgery and graft on a good switch from another pot. The last resort is to bypass the switch and rely on the mains switch on the wall. Not ideal but at least the set can work. It's a good idea to switch off at the wall anyway.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
