>I just received a new AMPEREX 4-1000A today from RF Parts. These tubes are
>great and hope to never see a Triton tube again. These are made by a
>company in France called Covimag and have massive graphite plates with a
>very sturdy mounting that is less susceptible to binding out of axis if
>they are dropped in shipping.
Triton needs to send one of their engineers to enroll in a sheet metal
shop class. I took one and we learned that good spotwelds are not sound
unless they look like some of the metal has melted. In other words, a
real pretty weld is really pretty weak. The solution is to increase the
spotwelder current (and/or increase the weld-time)until the weld looks
nasty.
>
>Eimac tubes are still good if you can find them
Varian-Eimac glass-envelope tubes which were manufactured in Salt Lake
City often had the weak spotweld problem. Eimac-San Bruno tubes did not.
> but avoid Penta
The Penta tubes I tested that were made in China did not have the weak
spotweld problem.
>or ETL and
>Triton tubes. Also, I have had no trouble with very old RCA 4-1000A tubes
>either (all I have were made in the 60's).
>
>...
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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