[ARC5] ARC-5 Alignment Question

[Dennis Monticelli]

FYI.  Whether or not you should re-tweak alignment when dropping in another
tube (glass or metal) depends upon the frequency of operation.  In a 455 KHz
stage, I doubt it.  But higher frequencies could be affected by a small
amount.  I tried three different 12K8 mixers in a BC-453B and the freq
spread among them was about 1 to 2 KHz at the high end of the set's range.
A BC-459 would experience much more potential shift.

Dennis AE6C

On Mon, Dec 20, 2010 at 3:19 PM, J. Forster <jfor at quik.com> wrote:

> Hi all,
>
> First off, in the Subject line, please construe ARC-5 to include the
> SCR-274-N.
>
> In my previous post, I mentioned "tubeless" RA-a\10 receivers and got to
> wondering about retubing such a set.
>
> The ARC-5s often use metal tubes. Are the inter-electrode capacitance
> variations of such tubes significantly better than glass tubes?
>
> Are either metal or glass tube characteristics sufficiently well
> controlled so that a receiver could be fitted with off-the-shelf tubes and
> perform w/in specs without alignment, after initial alignment?
>
> Best,
>
> -John
>
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