Questions about tetrodes for specialists

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I found a type 36 tetrode and built the above circuit to test it as a preamplifier. However, I observed that from 20Hz to 15KHz the circuit provides 35Vpp at the output, but this voltage goes down to 27Vpp at 20KHz.
What can cause this loss of gain? The capacitances on the tube look ok.

Thanks

Aldovan

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Topic - Questions about tetrodes for specialists - Aldovan 13:20:53 12/01/16 (4)

RE: Questions about tetrodes for specialists - dave slagle 05:58:41 12/02/16 (3)

RE: Questions about tetrodes for specialists - Triode_Kingdom 08:21:27 12/02/16 (2)

RE: Questions about tetrodes for specialists - dave slagle 08:54:31 12/02/16 (1)

RE: Questions about tetrodes for specialists - Triode_Kingdom 13:08:12 12/02/16 (0)

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