>
>measures wrote:
>
>> Most hams are so terrified of a tetrode with 10,000w of dissipation,
>>they will sell cheap. My guess is that an 8171 can be found at a
>>reasonable price on rec.radio.swap.
>>
>Yeah, but Rich, unless they trip over one at an estate sale, MOST hams
>wouldn't even come into possession of one in the first place.
>
I know a ham who has a 8170, 8171, 8281 and 8349 (including socket) for
sale.
>>>Also who says you have to
>>>drive a pair of 4-1Ks with 350 Watts? That would assume that a single
>>>4-1K would need to be driven with 175 Watts.
>>
>>At 3500v, 175w of drive is about right.
>
>WHO drives a 4-1K with 3500 volts? That would be majorly silly.
>
That is what it takes for 1500w out.
>>
>>>I drive my single 4-1K with
>>>about 80 to 100 and get full legal limit. And I ALWAYS get great signal
>>>and audio reports.
>>>
>>zzzzzzzz zzz
>
>So I guess this means you aren't interested or applaud others in their
>success?
>>
Crowing is ok for roosters. For humans, it's not. .
>>>Plus there's a romance in seeing the glow of those old firebottles!
>>>
>>In a 4-1000 there is so much screen L, it's like being in parasitic hell.
>
>Hmmm...Gee, once I came up with a good layout, I didn't have any
>parasitic problems.
Tom Rauch talked plenty about "good layout" being the magic elixer to
cure parasites, but he never explained the real-special secret stuff to
us. .
>In fact, I don't run nichrome in the anode OR
>supressor resistors for that matter. Haven't been able to find
>instability yet
Humans do not find parasites. They find you. .
>and I run 50 wpm dits with the PA all the time when
>tuning. Oh yeah, and with my layout, I have NO anode resonance I can
>find in typical 4-1K resonant area.
[chortle]. If you say there is no measurable dip with a dipper at the dc
blocking cap, a large pizza with 5 toppings and salad bar says there is.
>
>But then I guess I've done the impossible since every amp should have
>nichrome?
>
The first tetrode with handles amp that I built did not use a
resistance-wire suppressor. The second one did. The first one was an
education. The second one was boring. // Using a nichrome suppressor
is no big deal. It reduces VHF gain and Rp a bit over 40%.
>I left parasitic hell a long time ago and my amp came with me.
>
... when will they ever learn ...?
>
later, Jon
- Rich..., 805.386.3734, www.vcnet.com/measures.
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|