On 6/8/2010 5:37 PM, Carl wrote:
> So I guess that after these blow you will be going with 6A10's or whatever
> comes along next (-;
>
> If an amp doesnt work thru a contest year it wasnt big enough. I guess that
> is why homebrew is real popular again.
>
>
I understand that Alpha makes a good driver, but barring that a pair of
8877s should have sufficient drive for the final.<:-))
73
Roger (K8RI)
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Jim Garland"<4cx250b@muohio.edu>
> To:<amps@contesting.com>
> Sent: Tuesday, June 08, 2010 5:11 PM
> Subject: Re: [Amps] 1N5408 vs 1N5553
>
>
>
>>
>>> > From a quick search it appears that the 1N5553 reverse current is 1ua,
>>>
>> and
>>
>>> the 1N5408 is 5ua, both at 25*C. Leakage goes up with temperature.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>> I was surprised to learn that the 1N5408 is made by at least 29 different
>> manufacturers
>> (http://www.datasheetcatalog.com/datasheets_pdf/1/N/5/4/1N5408.shtml) ,
>> and
>> specs vary slightly among the group. General Semiconductor gives the
>> reverse
>> leakage (25 degrees C) as 5 uA, while On Semiconductor specifies it as 10
>> uA. On Semiconductor gives the 150C reverse current as 100uA, whereas
>> Semtech gives the 105C (not 150C) leakage current as 500 uA. Everbody
>> agrees
>> the 1N5408 is rated at 3ADC (with leads of about 1/2 inch).
>>
>> The 1N5553 also shows some variation among different manufacturers, though
>> most agree that the reverse leakage current at PIV is 1 uA at 25C, rising
>> to
>> 20uA at 100C. All manufacturers specify the switching speed of the 1N5553
>> at 2 usec, and nobody specs the switching speed of the 1n5408. Don't know
>> why. The 1N5553 is rated at 5ADC with 3/8 in. leads, or 3A DC, with
>> shorter
>> leads.
>>
>> You can buy one 1N5408 from Mouser for $0.15 (Taiwan Semiconductors).
>> Mouser
>> stocks tens of thousands of them. Mouser says the 1N5553 is now obsolete
>> and
>> no longer stocks them. Newark still sells them, however, and prices have
>> plummeted to about $1/ea in quantities of 1000. A few months ago, when
>> they
>> were still in production and "military approved," they were selling for
>> about $16/each. Maybe Uncle Sam finally wised up! (FYI, I bought fifty
>> from a local surplus dealer for $5. Nice little diodes.)
>>
>> 73,
>> Jim W8ZR
>>
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>>
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