Substitutions

Midway Electronics is doing everything it can to keep the kit prices back at the original 1998 prices Small Wonder had. In doing so we have to shop around for the best component prices without suffering quality.

Some parts may be substituted as follows:

2N3904 --  2N4401, 2N2222A, PN2222

2N3906  --  PN3906, 2N2907, PN2907

2SC2078  --  2SC2166, D44

MPF102   --  2N5457 or any good N-CH FET

SA612   --   SA602, NE602, NE612

1SV149   --    MV1662

1N4001   --  1N4002, 1N4004 or any 1 amp Schottky diode

42IF123 --  2u6FC, 3989 but be aware these might not tune the same and they might need different capacitors and they also have a smaller screwdriver slot.

Caution must be noted on the 7.5 volt and 33 volt zeners. They could be clear glass type like the 1N4148  or they may have a silver coating on the case. In any case, use a magnifying glass to verify the correct numbers. 1N5236 7.5 V, 1N5257 33V.

Some capacitors have different lead spacing and markings.

DO NOT substitute non NPO capacitors for NPO temperature stable types. You will experience unwanted drift if you do.