[AMPS] parasitic suppressors

[Peter Chadwick]

Ian says:

>For example, with an ideal 100nH/100ohm network, it only takes 29nH of
>series lead inductance to bring the equivalent parallel resistance up
>to 166 ohms at 30MHz [1]. 

I was assuming (possibly mistakenly) a suitable test fixture, so that the
connecting lead lengths dropped out of the equation. 

I presume by 'ideal', Ian means an 'ideal 100nH' and an 'ideal 100 ohms' -
not that 100ohms and 100nH is the 'ideal' network!

In the final analysis, as Ian intimated yesterday, it's basically a process
of empiric eclecticism. I still believe in being gentle with the HV and/or
screen voltage in doing the parasitic search, so as to  be kind to the
tube(s), though.

>[1] That calculation took about 1 minute total, using the NETCALC
>program which is downloadable from my web site. (New users can expect to
>take a bit longer  :-)

That calculation took under 30 seconds on my HP41, with series parallel
conversion programs! Pity the HP 41 isn't made any more - it's a superb
calculator.

73

Peter G3RZP


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm