PDA

View Full Version : My first AM station....



W1GUH
11-03-2011, 04:52 PM
Great vintage stuff there. On the left is the P-P 6AQ5's modulator for the Eico.

4815

kf0rt
11-03-2011, 05:10 PM
Way cool, Paul. The Eico 720 was my first real CW transmitter (1971, purchased used from CW Electronics in Denver for $45 as I recall). Never ran it on AM, but it was absolutely bulletproof on CW. In a fit of nostalgia, I found a clean 720 on eBay maybe 7-8 years ago and bid on it. All was going well until WB6ACU jumped in. In retrospect, I'm glad I didn't get it -- have too much stuff I don't use already.

Here's what it looked like in '71:
http://www.westton.com/misc/AMJ71.jpg

Star Roamer, oh my!

W1GUH
11-03-2011, 05:16 PM
Love the built-in look!

kf0rt
11-03-2011, 05:25 PM
I need to annotate that picture from the perspective of an OF.

Was 14-going-on-15 when that was taken.

WØTKX
11-03-2011, 05:28 PM
Sniff, sniff. :cry:

The Eico 720 was my first too. :yes:

W1GUH
11-03-2011, 05:31 PM
Me, too. That was '62-'63, I was 15. And the camera was an Exa 1 (http://zorki1c.com/camera/exacta.html). Probably Kodachrome 64, but coulda been 25.

http://zorki1c.com/images/exaI.jpg

W2NAP
11-03-2011, 05:33 PM
I found a clean 720 on eBay maybe 7-8 years ago and bid on it. All was going well until WB6ACU jumped in.

if he jumps in, might as well quit. he has the cash to make sure no body else wins

NQ6U
11-03-2011, 05:41 PM
In a fit of nostalgia, I found a clean 720 on eBay maybe 7-8 years ago and bid on it. All was going well until WB6ACU jumped in.

Farging bastidge. I never liked the Eagles that much anyway and if I never hear Hotel California again, that would be just fine with me.

WØTKX
11-03-2011, 05:43 PM
Hey man, Joe is not the Eagles...

kf0rt
11-03-2011, 10:07 PM
Farging bastidge. I never liked the Eagles that much anyway and if I never hear Hotel California again, that would be just fine with me.

Weird.

I absolutely loved the Eagles in the 70's. The shit just clicked back then.

They produced an album a couple years ago... "Long Road Out of Eden" as a comeback deal. Hated it; loathed it; it sucked. My review is simple: they can still play guitar, but lost the lyrical content.

kf0rt
11-03-2011, 10:12 PM
Hey man, Joe is not the Eagles...

Joe was a Johnny come lately.

Don't hate him or his music, but he's not on the 'A' list here.

Been using Pandora so much lately that I finally sent them the damn $36 out of sheer guilt.

Seed: Mark Knopfler. Oh, yeah...

n2ize
11-04-2011, 02:43 AM
if he jumps in, might as well quit. he has the cash to make sure no body else wins

best way to win on ebay. You keep getting outbid then, out of nowhere, you throw a huge amount of money down.

WØTKX
11-04-2011, 03:25 AM
Joe was a Johnny come lately.

Don't hate him or his music, but he's not on the 'A' list here.

Been using Pandora so much lately that I finally sent them the damn $36 out of sheer guilt.

Seed: Mark Knopfler. Oh, yeah...


Early Eagles was nice stuff. I'm exploring the amusing musical world of Spotify. :yes:

And now, some smile music...

http://youtu.be/5wTVLIZaxMk


http://www.youtube.com/watch?v=5wTVLIZaxMk&feature=related

W3WN
11-04-2011, 09:47 AM
Sniff, sniff. :cry:

The Eico 720 was my first too. :yes:My first QSO's under my own call were from WN2FEO's house, with an Eico 720 and a Hammarlund receiver (don't recall what model HQ it was). But I never actually owned one.

First actual working transmitter I owned was a used & heavily modified Ameco AC-1. That I still have.

W3WN
11-04-2011, 09:48 AM
Farging bastidge. I never liked the Eagles that much anyway and if I never hear Hotel California again, that would be just fine with me.Don't ever let my wife hear you say that. She was thrilled when we went to see the Eagles at Consol Energy Center last year; she'd also seen them in concert back when she was in college, back in the late 70's.

n2ize
11-04-2011, 07:36 PM
Early Eagles was nice stuff. I'm exploring the amusing musical world of Spotify. :yes:

And now, some smile music...

http://youtu.be/5wTVLIZaxMk


http://www.youtube.com/watch?v=5wTVLIZaxMk&feature=related

From the original W4CGP

W1GUH
11-04-2011, 09:28 PM
Any more vintage rig pix out there? It's a miracle I still have THAT one.

kf0rt
11-05-2011, 08:25 AM
How about some homebrew vintage amps?

This is from 1974, station is WØLJF's. Ed passed away in 1994. Amp on the left is a single 4-1000. On the right, a single 4-400 amp. Taken during the 1974 ARRL DX test.
http://www.westton.com/misc/ljfamps.jpg

kb2vxa
11-05-2011, 04:54 PM
What I don't understand is how you can fully modulate a 720 with a pair of 6AQ5s unless you throttle it back to 20W input. Even so you're running them at maximum output with a THD of 5% which is the threshold of audible distortion. Sure would be nice with the matching 730 modulator with a couple of kick ass 6CA7s in it.

W1GUH
11-06-2011, 07:14 AM
What I don't understand is how you can fully modulate a 720 with a pair of 6AQ5s unless you throttle it back to 20W input. Even so you're running them at maximum output with a THD of 5% which is the threshold of audible distortion. Sure would be nice with the matching 730 modulator with a couple of kick ass 6CA7s in it.


Exactly what I did. Wasn't planned that way, it kind of evolved. The story...

I"d set out to rebuild the Globe screen modulator for a Globe Chief. The PS on the chassis was done and the tube sockets for the modulator were mounted. Then I switched horses in the middle of the stream when I found the 6AQ5's in the '62 handbook. Planned for it to screen modulate a Globe Chief. That worked good. Then, I traded the Globe Chief for the Eico and while I waited for the Eico I used a borrowed DX-20 and screen modulated that.

When I finished the Eico and it was on the air on CW, I looked at the schematic to figure out how to mod it for screen modulation. As it turned out, the power switching the Eico is kinda crazy, so before I butchered that I just tried plate modulating it at low power. That worked out so well I just left it like that. Worked fine for locals, especially on 10m, and that's how it stayed.

WØTKX
11-06-2011, 02:39 PM
I bult a homebrew modulator for my Eico 720 with a two donated transformers and a pair of 6L6's. Actually, I got a lot of help from a couple of Elmers. Dang thing was cranky, at first. I did do all of the sheet metal work. :lol:

Watching it on the scope, it was best to keep the carrier at about 85 watts. Worked so well, I got yelled at by SSB guys for calling CQ in "their band". If I had their callsign, I'd send 'em a QSL card, noting the difference in modulation methods, signal report, a hearty 73 and an 88. I got a couple back too. :mrgreen:

w2amr
11-07-2011, 06:31 AM
Way cool, Paul. The Eico 720 was my first real CW transmitter (1971, purchased used from CW Electronics in Denver for $45 as I recall). Never ran it on AM, but it was absolutely bulletproof on CW. In a fit of nostalgia, I found a clean 720 on eBay maybe 7-8 years ago and bid on it. All was going well until WB6ACU jumped in. In retrospect, I'm glad I didn't get it -- have too much stuff I don't use already.

Here's what it looked like in '71:
http://www.westton.com/misc/AMJ71.jpg

Star Roamer, oh my!

Hey, A Star Roamer.
I picked this one up at a yard sale last summer. It will make a good resto project for the winter.
4825

W1GUH
11-07-2011, 09:47 AM
Hey man, Joe is not the Eagles...

That's the truth. And Don Henley was an Eagle, too, and who could find anything wrong with his "Heart of the Matter?" I'd post a link to that on YouTube if I could go there from here.