[Amps] Alpha 76A 3 Holer; 10 meter add

[Roger (sub1)]

On 4/3/2011 12:54 PM, Patrick Barthelow wrote:
> Gentlemen:
>
> On the Alpha 76A, Gray metal front Plate, 3 holer, 8874 == 3CX400  Eimac Tubes,
> Two questions, how does one add a ten meter switch function, (I am told it may only require a mechanical stop to be removed in the
> Band switch)    and,  if one of the thee no longer made   8874 goes, can it be run with two of the three remaining?

Last I knew 8874s are still being produced. OTOH they are *EXPENSIVE* 
for such a small tube.
http://www.cpii.com/product.cfm/9/22/76
Eimac is now owned by CPII. Econo is also part of the same group.

With a bit of hunting some one on here might have some.

73

Roger (K8RI)

> And if so, do any PI network changes have to be made?
>
> Also, opening one up I am attempting to identify the transformer used, as there were sometimes used
> Dahl tranformers, that were lighter than the standard.  This transformer is huge, open frame design,
> with stacked square laminations, 7.5" wide across the top, and about 3.25 thick.  Dont think it is the Dahl Option.
> Printed on the top laminations is probably a Mfg ID:  BTC 11163
> Best Regards,
> Pat Barthelow    AA6EG
>
>
>
>
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