R L Measures wrote:
>
> On Jul 31, 2006, at 10:38 AM, Steve Thompson wrote:
>
>>
>>
>> R L Measures wrote:
>>
>>>>
>>>> I can see an oscillation causing very high dissipation,
>>>
>>>
>>>
>>> Push-pull parasitics, yes, push-push parasitics no. To explain: With
>>> a push-pull parasite, the VHF energy from one tube alternately pushes
>>> energy into the other tube,and vice-versa, so both tubes have high
>>> dissipation until the operator stops transmitting. However, since
>>> there is a load on each half-cycle, there is no wild and crazy arcing,
>>> and grid-I is not excessive. If you want to see a push-pull parasitic,
>>> short out both parasitic suppressors in a SB-220, transmit, and with a
>>> litle bit of luck you will see both anodes turn bright red, The
>>> frequency is c. 50MHz. .
>>> However, Push-push parasitics tend to run amuck because they are not
>>> loaded.
>
>
>> Sounds very complicated.
>
>
> Push-push is like a pogo-stick. Push-pull is like a see-saw. It's
> elementary, Steve. cheerz
The topology is straightforward enough, not so the idea that one
topology won't give high dissipation, the other won't give high voltage.
Steve
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