[Boatanchors] 0Z4 Rectifier

[J. Forster]

It's ONLY the Canadian Mk IIIs that do this. No Mk II does it. It's really
neet to hit the pressel switch on the mike and hear the dyno spool up for
transmit.

Some UK versions have 2 dynos. One runs all the time, the second only on
Tx, I think.

-John

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


> The 19 Set supply would seem to be unique among military sets then.  All
> of
> the others that I can think of use either the Ratheon family of gas
> rectifiers (CK-1005, 1006 or 1007) and/or self-rectifying vibrators.
>
> In a message dated 5/19/2010 11:01:11 PM Central Daylight Time,
> jfor at quik.com writes:
>> 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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