Quote:
Originally Posted by TinCanAlley
The ones I'm looking at are the water tower looking one on the Horizontal module Q804 (121-447). Also, the Horizontal module is supposed to have a 121-931 (Q801), but there's a 447 in its place. Is this a suitable replacement, or is the 931 the best choice?
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Do you have the datasheets for the transistors? I looked around for them, but I can't find anything. I even went as far as doing a cross-reference on the an archived version of the NTE part cross-reference tool, but those numbers don't come at all.
I'm good enough to have an idea of which specs would be important to adhere to, but I can't tell you what the specs of the original transistor are without a datasheet.
In general though, both Q804 (waveshape) and Q801 (AFC) are not in super critical spots for either speed or gain. I would think that almost any decent modern transistor with the correct voltage requirements would do the trick. Something like a 2N4401 could work probably. Q801 would be more likely to have possible issues if the gain was too high because the AFC circuit might rely on the gain characteristics to lock in, but I can't tell you that because I don't know the gain of the original transistor.