>> RE reading specs: It is amazing that a number of Ham amplifiers use
>> 500pF and 1000pF 5kV doorknob caps for Tank ciruit padders which
>> obviously need a cap that can handle more current. The cap mfg's specs
>> make it clear that the 500pF and 1000pF units are intended only for
>> bypass and coupling service. Thus, to make a 400pF C-tune padder, 4,
>> 100pF, 5kV units are paralled on Cu plates. The Alpha 77SX is a good
>> bad-example.
>>
>> cheers.
>>
>> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
>
>Amen, Rich!
>It is obvious that 160 meters was an after-thought with the
>77 series from Alpha. Also, the 77SX tank coil is the same
>as the 77DX. (2 tubes vs one)
>
yea, verily
>Another one for the list is the SB-1000 from Heath. A suitable
>mica replacement is available from Ameritron for the tank
>door knobs in this unit.
>
Tom Rauch (SB-1000) and Dick Ehrhorn (77SX) are experts -- and "experts"
apparently don't need to read no stinkin' mfg's specs. Tom still
maintains that the 3-500Z is rated at 550mA, not 400mA. Both still
maintain that their amp designs have never had a vhf parasite.
cheers, Phil,
Murphy was right.
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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