[Amps] Suggestions for new Alpha Owner?

R.Measures r at somis.org
Tue Sep 27 11:20:02 EDT 2005


On Sep 27, 2005, at 7:04 AM, Michael Tope wrote:

>
>
> ----- Original Message -----
> From: "Frank N. Haas" <headrat at rats-computers.com>
>>
> I have been using a Heathkit SB-221 with much success for quite a 
> while.
> It experienced the dreaded Glitch and blew a tube. I added Harbach 
> mods and I
> don't worry about such things any longer.

Unless Harbach electronics has added more L to its 3-500Z suppressor 
inductor, a what, me worry position may not be appropriate since VHF-Q 
could be lower. .
>

> Is the Alpha subject to the same
> Glitch problem??? I did read where 24 MHz is not recommended because 
> of a
> HV plate choke resonance issue at 25 MHz.

The lowest resonance in the 50uH HV RFC is c. 43MHz.
>
> Are there other mods recommended?
>>
>
> http://www.dellroy.com/W4EF's-Ham-Radio-Page/Alpha78/Alpha78.htm
>
> 73 de Mike, W4EF........................
>
>
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>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org



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