[Amps] Parasitic suppressors on GI-7B.

[Peter Chadwick]

Ian said:
>2W or 3W metal film resistors are the modern substitute for solid 
carbon.<

Where I somewhat disagree is that 2 or 3 watt resistors provide enough dissipation. However, like all these things 'it all depends'
If you have a tube prone to parasitics and needing a large (comparatively) inductance in the suppressor, then operation on 10, 12 and maybe 15 can demand more resistor dissipation than in tube with a good short grid to ground connection.

>As others have said, if the grid ring of a UHF tube like the GI-7B is 
solidly grounded (and if there are no other unexpected feedback paths) 
then it may not actually need a parasitic suppressor.<
There we have total agreement. The posh term for finding out is ' a process of eclectic empiricism'. Others call it 'suck it and see' (which I recognise may have slightly different connotations the other side of the Atlantic)
73
Peter G3RZP