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eHam Forums => Amplifiers => Topic started by: KD0UN on November 05, 2012, 05:24:41 AM



Title: Love those 3-500's
Post by: KD0UN 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.



Title: RE: Love those 3-500's
Post by: KA5N 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


Title: RE: Love those 3-500's
Post by: K1ZJH on November 05, 2012, 07:56:03 AM
I just lost my breakfast....


Title: RE: Love those 3-500's
Post by: K8AXW on November 05, 2012, 08:26:58 AM
I just checked my bank account.....     >:(


Title: RE: Love those 3-500's
Post by: N3QE 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!!!!



Title: RE: Love those 3-500's
Post by: KT0DD 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


Title: RE: Love those 3-500's
Post by: K1ZJH on November 05, 2012, 08:42:46 AM
I wonder what the "driver" looks like?????


Title: RE: Love those 3-500's
Post by: NM8D on November 05, 2012, 09:42:41 AM

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

Michael
nm8d


Title: RE: Love those 3-500's
Post by: WB2WIK 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...


Title: RE: Love those 3-500's
Post by: K2TGI 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 !


Title: RE: Love those 3-500's
Post by: KD0REQ 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....


Title: RE: Love those 3-500's
Post by: QRP4U2 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?  ;D


Title: RE: Love those 3-500's
Post by: NO9E 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



Title: RE: Love those 3-500's
Post by: K0CWO on November 06, 2012, 12:51:10 AM
I guess I should vote today..............


Title: RE: Love those 3-500's
Post by: VK4PH 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.


Title: RE: Love those 3-500's
Post by: W4RS on November 08, 2012, 02:22:42 PM
i don't know who built it, but it is a very nice layout.


Title: RE: Love those 3-500's
Post by: KC4MOP on November 11, 2012, 05:01:33 PM
It looks like three muffin fans should do it for cooling. ::)
He's using single phase 220.

Fred


Title: RE: Love those 3-500's
Post by: K3WQ on November 12, 2012, 06:28:11 AM
http://stlouis.craigslist.org/ele/3374389046.html

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


Stange.  Would someone really price this at US$1?  Maybe US$1000. 

With only one three-turn inductor in the pi network, that's definitely a CB amp.  I see items like this on e-Bay all the time, although the construction on this one appears to be better than average.

I cannot now, nor will I ever, understand the mindset that drives someone to put the time, effort and money into something that's illegal, dangerous and devoid of any real on-the-air benefit. 

Well, if I lived in the area, I'd grab it for the parts.  It could be easily converted to a single-band, two-tube, legal-limit amateur amplifier.  A nice follow-on project would be conversion to several bands, which could be financed by selling off some of the spare tubes.

-Dave


Title: RE: Love those 3-500's
Post by: K8AXW on November 12, 2012, 10:17:40 AM
WQ: 
Quote
cannot now, nor will I ever, understand the mindset that drives someone to put the time, effort and money into something that's illegal, dangerous and devoid of any real on-the-air benefit.

There are basically two reasons for this.  One is that someone with enough know-how cobbles together something like this bigassed amplifier and sells it to a dyed-in-the-wool CBr for BIG bucks.

The second is that a lot of these so called dyed-in-the-wool CBrs are simply stupid people!  They believe just about anything they're told.  I mean man, you really have to be around these people to get an understanding on how they think!  It's really an experience.

Or you can analyze this last election.   ::)





Title: RE: Love those 3-500's
Post by: KC4MOP on November 12, 2012, 04:13:55 PM
At 10M the RF Exposure levels can be lethal at the power he claims from that amplifier.

Fred


Title: RE: Love those 3-500's
Post by: N6PJB on November 18, 2012, 04:47:15 PM
WQ: 
Quote
Or you can analyze this last election.   ::)





That's exactly right!


Title: RE: Love those 3-500's
Post by: WA8H on November 20, 2012, 11:35:32 AM
Hello I haven't posted in a long time. I recently picked up an I-phone 4S. I did a Google search on CB forums. Don't ask me why, just boredom. Here's a couple of links. Some of these guy's are really sharp.  I was surprised at the hams that check in. So this amp is really not to unique.
Many CB guy's run similar amps.

One guy wants to run a Eimac 4CX15000A in his mobile.
(http://www.mauldroppers.com/showthread.php?205-Mobile-tube-amps&s=b3e71aaa536d22ccd8df18b96a9188c0)
(http://www.mauldroppers.com/showthread.php?5550-3-500z-tube-amps)

Many of them use ham gear and amps. Some of it is interesting reading if you can get pass the profanity. Not to mention non of it is legal. 73 Glenn


http://www.mauldroppers.com/forum.php

http://www.cbtricks.com/

http://www.copper.com/cgi-bin/discus4/discus.cgi?pg=topics


Title: RE: Love those 3-500's
Post by: KD0UN on November 20, 2012, 09:38:09 PM
I would share the concern of another poster who commented about the dangers of RF exposure to such high powers, especially in a mobile.  I'm not an expert on it, but it would give me the heebee jeebees.