On 06/30/11 08:28 AM, Mike Tubby wrote:
> On 29/06/2011 19:11, Dr. David Kirkby wrote:
>> On 06/29/11 07:03 PM, Ron Youvan wrote:
>>> Jim Forsyth wrote:
>>>
>>>> How would you measure the PIV?
>>> You can measure the breakdown Voltage with a scope, ac power supply
>>> and a resistor.
>>> The "PIV RATING" is a breakdown Voltage that their products shall not
>>> fall below.
>>> 40 years ago I measured many 1N4001's (50 Volt at 1 Amp.) and most
>>> broke down around 155 Volts.
>> Sounds like a cheap source of 155 V "zener" diodes - or to be more
>> precise
>> "avalanche" diodes!
>>
>> (Only joking, I'd rather use a diode designed as a voltage regulator)
>>
>> G8WRB
>
> Dave... don't use them to regulate the screen supply of one of your big
> tetrode amplifiers ;-)
>
> Mike G8TIC
True - very true. 155 V would be too low, but a pair of them in series gives
310
V, which is about right for a number of tubes! IIRC, both 4CX250B and 4CX1000A
want 300 V on the screen, but I'm sure 310 V would do.
Dave
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