Transistor-testare & div. ic-kretsar
Postat: 25 april 2006, 13:04:49
Ställer två frågor åt en god man i orgelbyggarbranschen:
I need a good transistor tester/characteristics meter. These appear to have fallen from fashion, since all we can find on the market are small test boxes of the 'go/no go' kind. We need a universal instrument that can measure the performance of different transistor types, with an accompanying transistor data manual, against which the health of ageing transistors can be compared. We especially need to measure Hfe of power transistors like the 2N3055, in order to produce matched pairs. Does anyone know where we could get hold of such an test instrument? We have a very good AVO valve characteristic meter, and it seems odd that we are unable to test transistors to the same degree of sophistication as our valves. Perhaps AVO made a transistor tester?
Top octave generator I.C.s Several attractive Hammond models from the 70's and early 80's have a top octave generator consisting of two separate I.C.s which are becoming hard to find. The Hammond part numbers are 075-047242 & 075-047243. Other commercial equivalent I.C.s have the following markings; S2555 & S2556, MC1183 & MC1184, MM5832N & MM5833N. Does anyone know where these can be obtained? Or has anyone designed a one-chip replacement board? [Note to technicians; these two I.C.s become noticeably warm under normal operating conditions, and their life-expectancy can be extended by fitting I.C. heat sinks]
Så, kan någon svara på frågorna tro?
I need a good transistor tester/characteristics meter. These appear to have fallen from fashion, since all we can find on the market are small test boxes of the 'go/no go' kind. We need a universal instrument that can measure the performance of different transistor types, with an accompanying transistor data manual, against which the health of ageing transistors can be compared. We especially need to measure Hfe of power transistors like the 2N3055, in order to produce matched pairs. Does anyone know where we could get hold of such an test instrument? We have a very good AVO valve characteristic meter, and it seems odd that we are unable to test transistors to the same degree of sophistication as our valves. Perhaps AVO made a transistor tester?
Top octave generator I.C.s Several attractive Hammond models from the 70's and early 80's have a top octave generator consisting of two separate I.C.s which are becoming hard to find. The Hammond part numbers are 075-047242 & 075-047243. Other commercial equivalent I.C.s have the following markings; S2555 & S2556, MC1183 & MC1184, MM5832N & MM5833N. Does anyone know where these can be obtained? Or has anyone designed a one-chip replacement board? [Note to technicians; these two I.C.s become noticeably warm under normal operating conditions, and their life-expectancy can be extended by fitting I.C. heat sinks]
Så, kan någon svara på frågorna tro?