Hello,

That Q1 is MAV1-0104 made by Mini-Circuits. This part is exact replacement for the MSA-0104, which was in TenTec kits early.
The schematic of that pre-amp is pretty simple:

                           +12 V
                          |
                         [ ] (470 Ohm)
                          |
                          L1 (100uH)
                          |
50ohm input ---||-- Q1 -----------------||-----50 Ohm output
             0.01                      0.01


You are overdriving the amplifier. What is the part number of Q1? It
looks like a MAR-xx something.

The Tentek page does not have any good technical details on the amp
that I could find. What info do you have?

Regards

--
WBW,

V.P.
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