>2 Wrote:
>
>>>
>>>Paul and I favor the TL431-TIP147 bias circuit because we supply our
>>>different control boards for a large range of tubes, so we need a 'one
>>>circuit fits all' solution. Maybe that makes us biased?
>>>
>>I am biased toward simple, minimal-cost, glitch-resistant circuits that
>>work. The [Figure 7] optoisolator/10A, Si-npn switch/3A diode-string
>>will reliably handle a 3cx3000A7 and it switches in under 7uS.
>>
>>>However, if you're also going to use EBS, the TL431-TIP147 circuit has
>>>everything you need - the power transistor and the switching facility
>>>too. To bias off the tube, simply switch the control gate of the TL431
>>>to its anode (collector of TIP147). Switching time is a few
>>>microseconds.
>
>Both circuits can make equally valid claims of simplicity, low cost
What is the cost in quid [£] of the TL431-TIP147 circuit ?
>and glitch resistance.
What is the I-peak withstanding ability of TL431-TIP147 circuit?
>...
cheerz, Ian
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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