> Beats me. I've never been on 6, not since 1961 anyway. A lot of builders
> install a filament choke on a 8877 amp, example my Henry 4K Ultra, which
> runs a single 8877, had a filament choke. I'm not sure about an Alpha 77.
> I have always been told that in the HF region running a 8877, you don't
> need one in the filament circuit but a 2.5uH choke is required in the
> cathode to bias line. Bill Orr shows this in his 21st edition (1978)Radio
> Handbook on
Thanks,
I just might have that edition down in the basement...some where.
Roger (K8RI)
> page 22.41. If you don't already have some of Bill's old handbooks start
> looking for one if you're serious about amp building.
>
> Bob W6TR
> ----- Original Message -----
> From: "Roger" <sub1@rogerhalstead.com>
> To: "Bob Maser" <bmaser@tampabay.rr.com>; "Rick Stealey"
> <rstealey@hotmail.com>; <amps@contesting.com>
> Sent: Thursday, November 15, 2007 5:41 PM
> Subject: Re: [Amps] 8877 Filament choke
>
>
>>
>>
>>
>>> With an indirectly heated cathode you don't need a filament choke, in
>>> the HF
>>> region.
>>
>> What about when running one on 6-meters?
>>
>> Roger (K8RI)
>>
>>>
>>> Bob W6TR
>>> ----- Original Message -----
>>> From: "Rick Stealey" <rstealey@hotmail.com>
>>> To: <amps@contesting.com>
>>> Sent: Thursday, November 15, 2007 9:26 AM
>>> Subject: [Amps] 8877 Filament choke
>>>
>>>
>>>>
>>>> Info in the ARRL handbook seems to indicate that it might be better to
>>>> not
>>>> use a filament choke on an 8877 amplifier, that it might cause more
>>>> problems than it solves.
>>>> I wonder what you guys who have homebrewed 8877s think?
>>>>
>>>> Rick K2XT
>>>>
>>>>
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