Dunno if it'll be helpful or not but I'd had good results with LND150 depletion mode mosfets in various lower frequency tube circuits. They act a lot like a pentode in-circuit, with no screen connection, of course. Good to 450 volts.
Jamie
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--- In TekScopes@..., David <davidwhess@...> wrote:
I have a mostly functional Tektronix 184 Time-Mark Generator that I am
restoring. It has six 7587 nuvistor tetrodes and they all appear to
work except for maybe the pair in the 500 MHz multiplier.
You can still pick up used but probably good and NOS 7587 nuvistors
for reasonable prices but how feasible would it be to replace them
with say JFETs with cascodes?
I will probably try it no matter what is said here just for the fun of
it but any advice would be appreciated.
