>
>Hi,
>
>A colleague of mine has accumulated a large collection of amplifier parts,
>and is ready to embark on building an HF amp using an Eimac 3CX3000F7
>(that's the one with "tails").
>
>Are there any problems or pitfalls with designing an amplifier, using this
>specific tube, to run on 1.8-21MHz? Obviously, it needs lotsa drive.
>Anything else?
>
Float the fil. transformer on g10 fiberglas board, bypass all windings to
the core, and use a 3a bifilar fil. choke wound of c.10uH made with #20
ga. wire in the 240v primary of the transformer. // Some builders have
experienced osc. in the 70 MHz range, so you may want to use low vhf Q
parasitic suppressors. // If the tube has not been purchased: An 8171
drives with 150w, has up to 20db gain, is Much easier to cool, has a much
simpler tuned input, requires no fil. choke, and it has much more
emission.
>
- later, Al
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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