ameritron Al80A modification with GS31B

Discussion in 'Amateur Radio Amplifiers' started by IZ4OSH, Mar 3, 2019.

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  1. IZ4OSH

    IZ4OSH Ham Member QRZ Page

    The costs of a 3-500z are now impossible, this is a good solution at low cost and a lot of income.

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  2. N8FVJ

    N8FVJ Ham Member QRZ Page

    Chinese 3-500Z that are known to be good tubes costs $200.
  3. IZ4OSH

    IZ4OSH Ham Member QRZ Page

    Unfortunately the Chinese pipes are not as it seems, I had so many problems then the duration of the valve itself is not like those built by Amperex. However the change is worth it, with 30 wat input dispenses smoothly 900w, with 100w of 1800w input without a problem. Tested in the contest cqww 40w constant entry to worked non-stop for 48 hours successfully and does not warm as the 3-500z. I am very happy, now I'm thinking of making a pa for the 6m always with a gs31b which I find a very robust valve, and really a mule.

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