I got a lot of Old round can-type copper or "gold" lead mystery op-amps with no identifying marks, and plenty of 2n2222 and 2n3904-6 transistors from a family member, and I was building a few projects, such as http://fuzzcentral.ssguitar.com/schematics/fuzzjadeschem.gif
and had some issues. At first, I thought I'd just found a wrong schematic because the "MUD" control only worked within the last 5-10% of the turn and another schematic shows only a 10k value there. However, I also specifically chose a 2n3904 with β=60-70 in Q3 position.
I heard that it was possibly a bad transistor, so I tested the rest of the 2n3904's and got multiple values ranging in 60-90, multiples in 100-110, and the rest ranging in 120-180 range. I bought 10 2n3904's from an online parts store, and they all range from 200-250, with most sitting right around 235-245.
Is it possible that age and heat have damaged the older transistors, or were those values normal for back when Archer still existed? Are the older transistors out of spec for the circuit?
and had some issues. At first, I thought I'd just found a wrong schematic because the "MUD" control only worked within the last 5-10% of the turn and another schematic shows only a 10k value there. However, I also specifically chose a 2n3904 with β=60-70 in Q3 position.
I heard that it was possibly a bad transistor, so I tested the rest of the 2n3904's and got multiple values ranging in 60-90, multiples in 100-110, and the rest ranging in 120-180 range. I bought 10 2n3904's from an online parts store, and they all range from 200-250, with most sitting right around 235-245.
Is it possible that age and heat have damaged the older transistors, or were those values normal for back when Archer still existed? Are the older transistors out of spec for the circuit?