12AV6-12CS6 Transmitter(Revised Schematic)

35Z5 · **Posted:** Apr Mon 16, 2012 9:57 pm

Blustar1 wrote:

Bill: You could use a hand wound toroid for L3 like I did, but it's hardly worth the effort and expense.

Most builders of these Tx don't want to hassle with winding coils...

Tom

bill hamre · **Posted:** Apr Tue 17, 2012 3:29 pm

Most builders of these Tx don't want to hassle with winding coils...

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I'll just make it an option

Blustar1 · **Joined:** Jan Mon 04, 2010 2:52 am **Posts:** 730

Bill: For L3 (470uH), I used a FT-82-61 Ferrite Toroid which I purchased from Amidon. This required exactly 70.875" of #27 magnet wire wound 82 turns and allowing for 1.125" lead lengths.

rocketeer · **Posted:** Apr Wed 18, 2012 3:10 am

As I sit here listening to Nick Carter, Master Detective, on my Stromberg-Carlson 535M it occurs to me I have never thanked 35Z5 and all the folks who helped me through my construction process building this great little xmitter. Sooo, THANK YOU!!

Larry

Peter Bertini · **Posted:** Apr Wed 18, 2012 4:56 am

bill hamre wrote:

Bluestar,

Give me the spec that worked and I'll start supplying toroid as L3. Core #, wire size, number of turns.

Thanks,

Bill

Suggestion, it might be cheaper to use a molded 470uH choke for L3. A lot of modern
equipment uses them for resonant LC circuits. They have pretty decent Q.

Pete

bill hamre · **Posted:** Apr Wed 18, 2012 7:09 pm

Blustar1: thanks for the toroid specs

Pete: I'll stock what you suggest for L3, have you a source and parts #?

Peter Bertini · **Posted:** Apr Wed 18, 2012 11:34 pm

Bill, I'd feel better if someone tried one first before you invest funds in
a bunch of them.

You get molded 470uH chokes on eBay, free shipping for cheap prices.

http://www.ebay.com/itm/10-x-1-2W-470uH ... 0530156745

For 99 cents for ten, shipped, it is worth a shot.

Pete

rocketeer · **Posted:** May Tue 01, 2012 4:22 pm

Halfway there on #2. I need one 7 pin tube socket and a 12CS6 tube yet. I'm hoping to find what I need at Kutztown in a couple of weeks.

Attachment:

my_am_xmitter 2-9.jpg [ 90.24 KiB | Viewed 744 times ]

Here's a quick rough mockup of the front panel. That will be an ammeter in the upper left.

Attachment:

mp3_xmitter-layout 2s.jpg [ 39.33 KiB | Viewed 744 times ]

Larry

Tube Radio · **Posted:** May Tue 01, 2012 4:59 pm

Very nice work there.

What piece of test equipment was originally in that case?

That is similar to what I did with my 6GY6 two tube broadcaster. I used an old automotive tester for my chassis.

I plan to add at least one meter to measure 6GY6 cathode current.

rocketeer · **Posted:** May Tue 01, 2012 7:50 pm

It's the case from an old EICO model 950, like this (not mine).

Larry

Tube Radio · **Posted:** May Tue 01, 2012 8:00 pm

Very nice.

Blustar1 · **Joined:** Jan Mon 04, 2010 2:52 am **Posts:** 730

Impressive, and very creative! What a neat job!

rocketeer · **Posted:** May Sun 13, 2012 10:06 pm

Back from Kutztown with the tubes and parts I still needed so it's time to finish up this puppy.

Larry

rocketeer · **Posted:** May Fri 25, 2012 3:07 pm

Finished, up and running. Ignore the ammeter, it's a bad unit that's in there basically for looks.

Attachment:

my_am_xmitter 2-25s.jpg [ 60.97 KiB | Viewed 655 times ]

Larry

rxradio · **Posted:** May Fri 25, 2012 4:13 pm

DYN O MITE. Drool! It looks totally commercially made.

Dale

Blustar1 · **Joined:** Jan Mon 04, 2010 2:52 am **Posts:** 730

Sacre bleu! It looks totally awesome! Nice job!

35Z5 · **Posted:** May Fri 25, 2012 7:26 pm

Agreed, that's nice construction...

Since the meter is bad, sick a toothpick in the movement jamming it at around 2A, that'll have em talking...

Tom

rocketeer · **Posted:** May Fri 25, 2012 9:37 pm

35Z5 wrote:

Agreed, that's nice construction...

Since the meter is bad, sick a toothpick in the movement jamming it at around 2A, that'll have em talking...

Tom

, yep, that'll work. Reminds me of back when computers were running at 100Mhz (486). I installed a digital display on the front of mine and hard-wired it to display 400Mhz. It drove people nuts trying to figure out what proc I was running. :wink:

Larry

Flipperhome · **Posted:** May Sat 26, 2012 12:24 am

rocketeer wrote:

, yep, that'll work. Reminds me of back when computers were running at 100Mhz (486). I installed a digital display on the front of mine and hard-wired it to display 400Mhz. It drove people nuts trying to figure out what proc I was running. :wink:

Larry

I did something similar with my 300 MHz Celeron machine overclocked to 475 Mhz, except it was also a BP6 DUAL PROCESSOR (gasp, wow) so the 'speed' display was jumpered for a 'technically valid' 950, which raised a few eyebrows because there were no 950 MHz processors at the time.

I've still got that machine in service.

Tube Radio · **Posted:** May Sat 26, 2012 6:01 am

Flipperhome wrote:

rocketeer wrote:

, yep, that'll work. Reminds me of back when computers were running at 100Mhz (486). I installed a digital display on the front of mine and hard-wired it to display 400Mhz. It drove people nuts trying to figure out what proc I was running. :wink:

Larry

I did something similar with my 300 MHz Celeron machine overclocked to 475 Mhz, except it was also a BP6 DUAL PROCESSOR (gasp, wow) so the 'speed' display was jumpered for a 'technically valid' 950, which raised a few eyebrows because there were no 950 MHz processors at the time.

I've still got that machine in service.

Would be nice if computer cases still had a display for the processor speed.

12AV6-12CS6 Transmitter(Revised Schematic)

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