Might want to quantify if we are talking about directly or in-directly
heated cathodes during each comment too. It do make a difference.
rgroh@swbell.net wrote:
> Ok, how about pulling all the treads together on this topic and both
> summarize and visualize an ideal filament supply -
> 1. Regulated DC voltage - low noise
>
> 2. Voltage output settable to accommodate different tubes *
>
> 3. Output current is both controlled (will take care of turn on) and
> limited - current limit settable to accommodate different tubes
>
> 4. Ability to interlock with other control circuits to, for example, ease
> implementation of delaying application of HV, interlock with blower,
> delaying turnoff for cooldown.
>
> 5. It would be neat to tie all of this plus the voltage settability* to
> allow even more flexible operation such as standby operation (i.e. running in
> a 'almost ready' to go on the air - filament running at lower voltage, no HV
> applied, etc, low speed on fan and then, with one switch contact, be up full
> and ready to go in a couple of seconds).
>
> There has been a lot of discussion about whether or not controlling current
> on start is good, whether running filaments at lower voltages will prolong
> tube lifetime, etc. There is certainly debatable aspects of these factors but
> probably two points would be admitted by most (if not all) of us:
> 1. Controlling filament current surge on startup can't hurt
> 2. Delaying HV application until filament is up to temperature and
> stabilized can't hurt
> 3. Having a cool down period can't hurt.
>
> Agreed?
>
> 73
> Bob, WA2CKY
>
>
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>
>
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