[Amps] SB-220

[R.Measures]

On Nov 3, 2004, at 10:45 AM, Steve Thompson wrote:

> On Wednesday 03 November 2004 18:23, Will Matney wrote:
>> To all,
>>
>> A quick question here, and may open up a big can of worms, if there is
>> no such things as parasitics in amplifiers, why do they all come with
>> parasitic suppressors on the anode leads?
> There certainly are parasitics (unwanted vhf oscillation) - especially 
> with
> tubes with long grid leads - but not every amplifier will have the
> gain/feedback/load to allow oscillation if suppressors aren't fitted.
>
> It's likely that few amplifier builders have the equipment to properly 
> assess
> whether their amplifier needs a supressor, and/or whether the 
> suppressor they
> fit actually does the job of reducing the gain by the right amount at 
> the
> right frequency.

Steve -- In my experiences, 813 amplifiers do not need a VHF parasitic 
oscillation suppressor.
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org