The D-104 likes a high Z load of about 4.7 megohms, (to achieve proper
response) and you don't get this with newer TenTecs and solid state
rigs. This has been addressed before, but I can't tell you where to look
at the moment. One obvious way would be to use an emitter-follower
circuit to go from hi to lo Z.
Try the "hints and kinks" publications from ARRL......
73,
Perry w8au
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