On Mar 26, 2006, at 4:25 PM, Will Matney wrote:
> There still available, though more expensive now. Mouser can probably
> get them, but I think Allied Electronics has them. I'm not sure what
> brand they are. I remember seeing them in one of those catalogs.
> Another place to look is the surplus houses or sometimes on ebay.
Carbon-film resistors make good grid-fusing resistors, providing the
W-rating is such that they are able to open fast enough to protect the
grid during a glitch. For grid fusing with 811As and 3-500Zs, I use
30-ohm, 0.25W-rated carbon film resistors. I tried using 0.5W-rated,
30-ohm units, but I discovered that they were a bit too hard to blow to
protect 811As.
In my opinion, a blown 51-ohm, 2W grid resistor in an 811A amplifier
indicates that a VHF parasitic oscillation may have taken place, so
merely replacing the resistor is not the solution.
>
> Best,
>
> Will
>
> *********** REPLY SEPARATOR ***********
>
> On 3/26/06 at 7:18 PM ValErwin@aol.com wrote:
>
>> Howdy Chis:
>>
>> Can't help U with the resistors but I had a similar problem late last
>> week..............I had a blown 51 ohm/2W grid resistor in a
>> AL-811H. I
>> ended up
>> "tweaking" another close value resistor with a hacksaw to get the
>> desired
>> value.
>> The old timers will remember that trick.....
>>
>> Perhaps the group can help with a good source for carbon comp,
>> non-inductive
>> resistors?
>>
>> Regards,
>>
>> Val
>> W5PUT
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>
>
>
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Rich Measures, 805.386.3734, AG6K, www.somis.org
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