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Message: [QUOTE="Whoops, post: 1019889, member: 19985"] No. Jakob just advised you to change them in case they were shot. You can also test transistors with a cheap MK-328 component tester, I advise you to buy one as it's a really useful unit. (You can also test transistor with a multimeter in Diode mode). If the transistors are good and working, there's no reason to change them. You should replace all Electrolytic capacitors and Tantalum capacitors in the modules for precaution, because they're pretty old and fail. If you change them you can be confident these mic pres will work well for many years. I don't see why, they are not in Studer's schematic, and the original circuit is incredibly good, why change something that works and sounds great? I replace the Tantalum capacitors for the same dielectric, so Tantalum for tantalum and Electrolytic for Electrolytic. Changing the dielectric will also change the original sound, and the original sound is really good. These are extremely good and well sounding Preamps, I used them in many records and was impressed by the sound from the first time I used them. A Studio I used to work had 16 of them, and truly I became a fan and liked them so much I bough some units for myself. You seem to be eager to change and modify parts in the circuit, but I never found anything that needs to be modified, they're great stock. Faster Opamps doesn't mean that it will sound better, Neve preamps are slow and it's still the most well know and regarded mic preamp circuit in the world. Also modern IC based mic preamps are really fast and people don't regard those so well in terms of sound. Replace the polarized capacitors in the boards and have Fun recording with them for the next 30 years. My 2 cents [/QUOTE]

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