Zenith 25EC58 Restoration Thread

[TinCanAlley]

Originally Posted by vol.2

If you show me a circuit (the schematic) with a transistor, and you give me both the original transistor and the one your are thinking about replacing it with (and their datasheets), then I can probably tell you with some confidence if it's going to work.

That's about the extent of my knowledge with this stuff; one at a time. I can't sign off on blanket replacements between transistors regardless of the use case. I'm not that good at it.

Sounds good. I've tried to figure out which transistor package is from what year and if one is better than the other. For the 695s, I received 3 different package types, There are round white ones with black tops, black round ones that look like a water tower and the TO-92. I tried looking up the other 2, but I found no package numbers for them. I'm assuming the ones not TO-92 are earlier versions and might be of lesser quality.

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?