Re: [TCML] on rotary gaps and tone wheels

[Phillip Slawinski <pslawinski@xxxxxxxxx>]

Surplus prices....

On Wed, Oct 24, 2012 at 7:58 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
> On 10/24/12 5:10 AM, Phillip Slawinski wrote:
>>>
>>> In days of yore (say, 10 years ago).. the peak power in a SG TC (say,
>>> discharging several tens of joules at 30kV) was higher than you'd get in
>>> a
>>> SSTC (because the pass devices can't take the peak current).
>>>
>>>
>>> Consider a primary with a 0.035 uF cap charged to 30kV discharging into a
>>> 80
>>> uH primary (fres around 95-100 kHz).. The peak current is about 630 A.
>>> back
>>> when, this would be a challenge to handle with FETs (or a vacuum tube).
>>> I
>>> suppose today, one can get IGBTs that can handle that sort of peak
>>> current.
>>
>>
>> The power gap between SGTC and SSTC has been gone since the invention
>> of the DRSSTC.  For a while there was quite a price gap between DRSSTC
>> and SGTC, but lately that seems to be narrowing.
>
>
>
> when considering retail prices for components, or eBay/Surplus prices?
> Those popular CM600 bricks run about $400-500 each retail..
>
>
>
>
>
>>
>> As to the peak currents, in general the peak currents you find in a
>> SGTC of a given size are considerably lower than those you find in a
>> DRSSTC of a similar size.  There are many DRSSTCs that running tank
>> currents well in excess of 1kA these days.
>>
>> -Phillip Slawinski
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>
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