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| Old radio, old transistors, old me... |
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| oldway:
--- Quote from: IanMacdonald on May 10, 2018, 05:04:53 pm ---You could probably use TIP41/42 silicon TO220 replacements so long as you increased the interbase bias voltage to just below where they start to conduct. Generally the best way to do this is to use a 'Vbe multiplier' arrangement. It will probably work without modification but will have high crossover distortion. --- End quote --- Non sense, you find AD161 / AD162 cheap and easy !!! https://www.ebay.de/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.Xad161.TRS0&_nkw=ad161&_sacat=0 I don't know if the url will work, if not, look for AD161 on ebay.de (Germany) |
| bob225:
you can use silicon but you will need to adjust resistor values to suit you can get away with near spec transistors You may want to read this page I come across on the search for AD and AF transistors info https://www.markhennessy.co.uk/articles/vintage_transistors.htm I have just started working on some Roberts radios my self, its a bit of a learning curve |
| oldway:
In repair, we try to simplify life, not to complicate it with doubtful modifications of circuits. Otherwise, we do not repair anything, we waste time. The only frequent and justified modifications are to replace some lamps hard to find or expensive by LEDs. Here there is no reason to change anything. AD161 and AD162 can be used. Besides the drivers transistors are probably also to replace .... AC127 / AC128 probably. Remember that we must take precautions to solder germanium transistors.... |
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