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Author Topic: Love those 3-500's  (Read 6452 times)
KD0UN
Member

Posts: 67




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« on: November 05, 2012, 05:24:41 AM »

http://stlouis.craigslist.org/ele/3374389046.html

I know it's dumb to post these, but this is extreme.

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KA5N
Member

Posts: 4380




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« Reply #1 on: November 05, 2012, 05:57:08 AM »

Gee in one picture I think I can see a Radio Moscow sticker (In Cyrilic script of course).
and a serial  "Woodpecker #3".  But my eyes aren't what they used to be.  With this dude
you could save on gas or fuel oil in the winter  with the filaments on.

Such a deal

Allen KA5N
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K1ZJH
Member

Posts: 1185




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« Reply #2 on: November 05, 2012, 07:56:03 AM »

I just lost my breakfast....
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K8AXW
Member

Posts: 4004




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« Reply #3 on: November 05, 2012, 08:26:58 AM »

I just checked my bank account.....     Angry
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N3QE
Member

Posts: 2432




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« Reply #4 on: November 05, 2012, 08:28:27 AM »

Dinky pi network unless it's 11M :-)

Put enough 3-500Z's in parallel and the combined plate impedance will be low enough that you won't need a pi network to drive 50 ohms!!!!

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KT0DD
Member

Posts: 284




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« Reply #5 on: November 05, 2012, 08:40:09 AM »

I just checked my bank account and then lost my breakfast...hi hi.

Too bad Eimac couldn't have put in a self-destruct circuit in at the base of the tube (inside the glass envelope) so that anytime "breaker 19" was modulated, the tubes would explode.

I'll bet they could do it today with micro SMT technology!

73. Todd - KT0DD
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K1ZJH
Member

Posts: 1185




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« Reply #6 on: November 05, 2012, 08:42:46 AM »

I wonder what the "driver" looks like?Huh?
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NM8D
Member

Posts: 59




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« Reply #7 on: November 05, 2012, 09:42:41 AM »


HAHAHA,
I guess SSB is Intermittant use in CEEBEE Speak!!!!

Michael
nm8d
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WB2WIK
Member

Posts: 20669




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« Reply #8 on: November 05, 2012, 10:13:04 AM »

Unless there's more to that amp than is shown, I'd think the filament pins would all unsolder themselves with any kind of use, as I don't see any air flow cooling them under the sockets...
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K2TGI
Member

Posts: 21




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« Reply #9 on: November 05, 2012, 11:21:06 AM »

That will definitely break up a pile up . . . . but you need a 440 volt line to power it !
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KD0REQ
Member

Posts: 1054




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« Reply #10 on: November 05, 2012, 04:16:21 PM »

is that IHF watts?

and do you have to pay per diem and gas for the FCC guys who will follow the truck carrying this thing all the way to your house?

inquiring minds want to know....
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QRP4U2
Member

Posts: 130




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« Reply #11 on: November 05, 2012, 07:26:03 PM »

Quote
Unless there's more to that amp than is shown, I'd think the filament pins would all unsolder themselves with any kind of use, as I don't see any air flow cooling them under the sockets...

So what's the problem, he has THREE impressive fans blowin' on the tubes. What more do you want?  Grin
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AC0OB - A Place Where Thermionic Emitters Rule!
NO9E
Member

Posts: 439




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« Reply #12 on: November 05, 2012, 10:41:15 PM »

Can anyone guess what would be the max power?

The transformer with the tubes is probably for filament. Perhaps 45V and 15A, for some 700W of heating all the time. The other transformer is massive but subject to the limit of 240V line.

Also, if its grounded grid, it needs lots of drive.

Ignacy, NO9E

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K0CWO
Member

Posts: 419




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« Reply #13 on: November 06, 2012, 12:51:10 AM »

I guess I should vote today..............
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VK4PH
Member

Posts: 12




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« Reply #14 on: November 06, 2012, 04:38:04 AM »

Seriously here in VK land we can not afford the electricity necessary to run one of these let alone stay within our output power limit.
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