09-12-2016, 06:18 PM
The LT44 is only a 10:1 impedance ratio, 20K to 1K + 1K
so if you put 32 Ohm load on 1/2 the secondary, then it's only 160 Ohms on primary.
Also it can't take much DC current, it's a driver transformer for germanium transistor feeding 2 x germanium push - pull output.
The LT44b is rated 10K to 500 + 500 Ohms.
The LT700 is rated for 1.2K + 1.2K to 3.2 Ohms, so is far more suitable to adapt a 600 Ohm to 4K Earphone socket to 16 Ohms (32 +32 stereo phones).
However neither can cope with Anode current. Both are abysmal bass response and modern 32 + 32 or 8 + 8 stereo phones need an amp as the transformer reduces the signal level. Both 600 Ohm + 600 Ohm (headsets using telephone inserts) and moving iron 2000 + 2000 Ohm headsets are quite sensitive compared to many modern earphones, though not hifi due to moving iron (steel disc).
PDF
LT44-LT700.pdf (Size: 73.3 KB / Downloads: 7)
so if you put 32 Ohm load on 1/2 the secondary, then it's only 160 Ohms on primary.
Also it can't take much DC current, it's a driver transformer for germanium transistor feeding 2 x germanium push - pull output.
The LT44b is rated 10K to 500 + 500 Ohms.
The LT700 is rated for 1.2K + 1.2K to 3.2 Ohms, so is far more suitable to adapt a 600 Ohm to 4K Earphone socket to 16 Ohms (32 +32 stereo phones).
However neither can cope with Anode current. Both are abysmal bass response and modern 32 + 32 or 8 + 8 stereo phones need an amp as the transformer reduces the signal level. Both 600 Ohm + 600 Ohm (headsets using telephone inserts) and moving iron 2000 + 2000 Ohm headsets are quite sensitive compared to many modern earphones, though not hifi due to moving iron (steel disc).
LT44-LT700.pdf (Size: 73.3 KB / Downloads: 7)
