Yeha, I have found gas tubes supresors from Sankosha.

> -----Mensaje original-----
> De:   Peter L. Peres [SMTP:plp@ACTCOM.CO.IL]
> Enviado el:   Thursday, September 27, 2001 2:59 AM
> Para: PICLIST@MITVMA.MIT.EDU
> Asunto:       Re: [ot]: MOV testing
>
> Gas suppressors and spark gaps need a minimum current to work right. If
> there is not enough current they will oscillate between the start voltage
> and the burn voltage. This is how neon tube relaxation oscillators work. I
> was recently able to make a 0.5kW mercury vapor lamp 'sing' like this at
> 17Vdc and 0.1A across the tube ;-). The oscillation amplitude increases
> with decreasing current as expected.
>
> Are there not 75V zeners (tranzorbs) ?
>
> Peter
>
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