[Amps] Pulser

[Roger (K8RI)]

On 9/10/2012 4:48 PM, Edwin Karl wrote:
> The theory behind pulsing when tuning is to tune the radio (remember
> plate and
> tune controls) without over dissipating the finals (sweep tubes and even
> the almighty
> 6146 included).

That is not why  use pulsed tuning!
A Carrier presents a continuous load and drags the HV down. How much 
depends on regulation.   So with a carrier you are tuning with lower HV 
than with pulsed tuning.  My tubes have enough dissipation to handle a 
carrier at full bore as did the old 6146's in my tube gear, but HV?  the 
old rigs had a tune position with a lower voltage. Tune up, switch to 
the higher voltage and you still were in tune.


> Works just as well for tube amplifiers. You just send a series of dits
> using the key and
> peak the output. In my opinion then use a 'scope to check linearity of
> your amplifier.
> But I'm old and no one seems to use 'scopes anymore.
> But back to square one, you don't need another box in the shack, just
> use your keyer.

Yup. You can even calculate the duty cycle.

73

Roger (K8RI)

>
> ed K0KL
>
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