How to build a 6v6 tube ham transmitter AM modulator by d-lab electronics

A great way to utilize your junk box items and make a cool modulator for your CW rig. This is the 3rd one that I have made. This one uses a Multi-Elmac transformer.

[@Antony_Jenner]

Hey Terry after watching many of your videos I wish to say thanks for giving me the inspiration to restart my amp repair shop. Didn't realise how much I missed it.. A happy new year to you and your family. Tony

[@d-labelectronics]

+A Last Roger that man. Glad I could make it intriguing again. Every day in the shop is a new adventure. Plus, there are not too many people in the art anymore. Sky's the limit! Enjoy and have a great 2016

[@rjnmex]

She's so cute!! The modulator is great too! :-)

[@billsheppard9368]

Cool project. Believe it or not, 25 cycle power transformers can be used for plate modulation. Enough iron in 'em that core saturation is not a problem. Audio is broadcast quality up thru about 5 khz then smooth rolloff.. In areas where 25 cycle hydropower was used, these xfmrs were pretty common. They can do single-ended Heising as well as full-on push/pull with two 25 cycle xfmrs running back-to-back, driven by 6L6s in pp.

[@towerman75]

Enjoyed the video, but you would think in going through all the trouble to build the unit, one would take the time to clean and add a little black paint to the transformers.... Of course, that's just me.

[@Steven-pv1xr]

Great project i just wish we had more AM stations. I had several 6 meter AM stations tjat i have mpthballed because no one to talk to KA5WZY

[@medhawk4885]

Great video and thanks for all you do here. I have really picked up a lot from your tips. ~N4TYX~

[@d-labelectronics]

+MedHawk Thank you Sir. Always enjoy hearing from fellow Hams

[@28noch]

nice job Terry! happy new year!

[@d-labelectronics]

+28noch Thank you Sir. I have the cabinet finished. Looks very retro. I will post a few pics on my website.

[@sciencefollower]

DEAR SIR, YOU HAVE NOT SHOWN THE CIRCUIT DIAGRAM OF AM MODULATOR PLEASE.

[@RonMack07]

My question is can these old parts be made up? Such as out of new parts and modifications?

[@N2RRAny]

Hello Terry. Love your vids. What type modulator transformer is that and what are the typical types normally and best used?

[@d-labelectronics]

The one is this build came from a Multi-Elmac transmitter. UTC types are very common to find on ebay. Lots of good documentation available.

[@nyte_owlshortwavelistening9793]

Sweet!

[@d-labelectronics]

+nyte_owl shortwave listening The cabinet is almost ready. New paint job. Soon, I will post a video of the modulator mated to a CW transmitter

[@umajunkcollector]

Marvin the Martian, "Hermodium pew 36 explosive space modulator"

[@d-labelectronics]

+umajunkcollector That was my favorite Bugs Bunny cartoon

[@user-su5sq5ib3i]

Can I use a toroidal transformer in place of an old mod transformer?

[@charleshawes8618]

I would like to build this project De KB8BFM

[@camaroman9441]

Now that I've seen this and found out where the needed transformer came from, why would I want to destroy another beautiful old radio for its parts to make this? A better idea would be to restore the Elmac and find a transformer elsewhere.

[@NHSbandUnofficial]

You mentioned using an "Octo plug?" on the back. I'm looking for something simular to replace a battery supply plug on a farm radio. Could you point me to a good source? Thanks!

[@d-labelectronics]

+Dan Barrera Hello, I buy mine from the TubeDepot. They are in TN. Good selection of octal plugs/sockets

[@NHSbandUnofficial]

Thanks Terry! I always enjoy your videos. Hope you and your family have a great 2016!!

[@axandio]

How much audio power does the modulator throw into a class C amp? I have a nice NOS 809 GE tube good for 25 or 30 watts of AM carrier.... I am considering 6L6 vs 6V6 push pull. I have a nice Stancor A-3845 mod xfrmr.

[@d-labelectronics]

+Jay “Spirited Soul” Tee Hello, this modulator is approx 15 watts. I have a giant 6L6 modulator that does approx 40 watts

[@ebones6957]

How about a schematic?