[Boatanchors] 0Z4 Rectifier

[J. Forster]

The Canadian WS 19 Mk. III used a vibrator power supply with a cold
cathode rectifier. There is a special modification for when the set was
used in arctic conditions that replaced the 0Z4 with a 6x4 (I think).

Best,

-John

================


> The high forward voltage required to fire no doubt explains why they were
> only used in vibrator supplies.
>
> In a message dated 5/19/2010 9:04:28 PM Central Daylight Time, al at ar88.net
> writes:
>> I had to dig to find any info at all on this subject.  Fred Terman in
>> the 1943 edition of "The Radio Enginee's Handbooks" says, " Such
>> rectifiers are used to a limited extent in connection with vibrator
>> power supplies.  They have the advantageof needing no filament heating
>> power, but require a relatively high voltage drop to start the flow of
>> current, and introduce high-frequency transients."
>>
>> Checking the data sheet, one finds they need 300 volts to fire, and
>> there is a requirement to maintain a 30 mA current flow.  I'm guessing
>> they aren't particularly efficient when sine waves are applied, as they
>> wouldn't fire until late in the cycle.
>>
>> BTW, a 6X5 or 6X4 rectifier only draws 450 mA for the heaters.
>>
>> Al
>>
>> On 5/19/2010 12:03 AM, mac wrote:
>> >Saved a couple of amps of filament current.  Significant back in the
>> >days of 6 volt electrical systems.
>> >
>> >Dennis D. W7QHO
>> >Glendale, CA
>> >
>> >
>> >
>> >On May 18, 2010, at 9:41 AM, Jim Haynes wrote:
>> >
>> >
>> >>I've wondered from time to time why the 0Z4 rectifier was used in,
>> >>and used only in, automotive radios with vibrator power
>> supplies.......
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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