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LONGHIN - Great Tube Testers from Italy
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New project with 30 cm Tfk field coil drivers and Siemens 11n tweeters (part 2
This is an exceptional project!
Inside the boxes are 29,5 cm Telefunken / Siemens full range field coil drivers with a nominal impedance of 15 Ohms. The field coils require 100V DC and draw 110mA. The Siemens tweeter is the type 11n with an incredibly strong Bonn AlNiCo magnet.
The boxes meassure 86 x 51 x 28 cm (incl. the tweeter unit) and are made of American walnut veneerd birch ply wood. The back panel is 5 mm light weight Gabun plywood. There is no internal damping at all.
I decided to place the tweeter on top of the box to maximize the dipole characteristics. The network is as simple as can be: 1/1/0,5 uF NOS Siemens caps dated 1956.
The only things I didn't do myself are the little cloth bags for the tweeters. These were made by my Turkish tailor. I - personally - HATE sewing!
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