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please note:
"european parts" BC550 / BC560 / BF245C have reversed pinout compared to "US parts" 2n5088 / 2n2087 / 2n5486 !
pics show dDBs populated with BC*** / BF*** !

click on pics for full scale images

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Pictures below by courtesy of Neil Rothschild show the dDB populated with 2n5088 / 2n5087 / 2n5484 / MJE243 / MJE253:

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To get some kind of test board for trying different transistors, socket the transistor locations with SIP sockets. TO-92 transistors can pe plugged directly into the sockets. The legs of TO-220 are too large, solder SIP pins or SIP sockets to the transistor's legs.

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