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Do you know of a way to load from paper tape rather than cassette?

What size is the coil itself (without the board?)

I am so pleased you added this. Just for info, I had to enable the [root:rs232:terminal:keyboard] within the "Input Settings/KeyboardSelection" to get this to work.

It would be great to be able to upgrade the RAM to 32 or 64k. There are a few Tiny Basic programs that need more than 4k

I have been wanting a Heathkit H8 for a while now, this lets me play with it and get used to it before I end up buying one. I figured out how to get BASIC loaded off a tape image and actually use it (Had to fiddle with the Machine Configs in MAME to get the serial terminal in MAME working properly)

Thanks for this detailed informative video. Will this work with World War II-era vacuum tube transmitters? I assess that this keyer has only iambic mode A?

I have the IMA-18-1 solid state conversion installed in one of my 2 Heath 5228's so current draw isn't an issue on that one. I have a bunch of Chinese buck converter boards, thanks for the idea! Radio alignment is the biggest reason these 2 relics still populate my bench. The other is the high voltage probe for checking/setting anything with a high voltage. Not the most accurate pieces of equipment, but since I'm using it mostly for relative measurements the accuracy isn't much of a concern.

I used a C-3 for over 40 years to check leakage on caps. First job in the early 80's was a bench tech at a family run TV shop. Always gave great service, never touched anything inside. The only complaints I had were the voltage was fixed so you couldn't check anything under 25V, and it stopped @ 450v instead of 600v so the upper end was limited as well. I eventually replaced it with a General Radio 1617 Capacitance Bridge. A few years later I picked up a Sencore LC77 Capacitor/Inductor analyzer. Both the GR and the Sencore have variable test voltages that max out @ 600v.

These Heathkits were commonly found at smaller radio stations that could not afford the HP 334 distortion analyzer series. The expensive HP essentially works the same way. At one time a FCC requirement for radio stations required an annual “audio proof of performance”. I spent many hours after midnight using the Heath and HP distortion analyzers. Those days are long gone now. I still have my HD-1 and HP 334A. Pretty much useless on today’s high quality audio gear.

Very Good. Just picked one up today at the flea market.

I tried to lean on one of these back in the early 80s, borrowed it from a friend who had stolen it from his high school ;), big complaint it would do one to three chip circuit but after that you ran out of room and the only result was frustration. There is only so many times you can make the same blinky light circuit and not not get board and frustrated as a teen.

My dad brought an early one back from the States and we built up a 32K system over time - eventually with an RX-01 8" floppy drive from a PDP-11 which fell off a truck. Good times. It drew so much power, when overclocked to 2MHz, I had to cool the thing with fans and heatsinks! I think, from memory, we were paying about $25 for each 2114 memory chip - at only 512 bytes per chip!! Edit: with help from the local gurus at DIGITAL I believe we were able to get the RX01 drive to RW at 480KB per side for a total of 960K, on each IBM diskette. After 1KB/s via cassette, it was miraculous.

I've restored several Mohicans and have never found a defective transistor. It was one of the first radios to use crystal (ceramic) filters in the IF section: no IF alignment and fine selectivity. The whip antenna is massive and the radio receives better than most modern portables I own on AM with built-in antennas. SSB is unusable because of temperature sensitive oscillator drift. A nice radio for any collector. Long live AM!

I found an O-12 while thrifting. I guess the I stands for "improved"? They made it look more like a Tektronix.

You can hear the music from tesla coil by fm radio

Simply the best Pinball Machine ever!

Hello Jeff, a very nice project. I am trying to find the 0.1 inch female connectors to slide onto the flexible flatcables. Where did you find these or do you have a specific name to search on? Using these makes it much neater and flexible.

Still have mine! My Fluke, Kelvin & IBM multimeters have all bit the dust, but this Heathkit one lives on!!!

Still have mine! And it still works perfectly! -> Thanks for making this video!😊

Congrats on the new book. It looks awesome.

Can I get the schematic diagram for the EMC 802 as I have one that needs maintenance

If you are interested in Diode 1SS86/Hitachi pls go to my main page.

Brilliant . . . Bravo!

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Hi jeff. I use the lattice gal And at work perfectly.

Do these actually work? Or do they make good boat anchors.

july 14 2024 .... still love the videos. nicely done. just the right amount of info.

HEATHKIT were good radios. I remember getting the catalog in mail……and wishing I, a 12 y/o , could afford one.

Where can i buy one.

Complex to use... with two units. I've never seen one.

well done video and lots of good info .

just found 2 at an antique store near me for 65 dollars each , one powered up and had some reception. other untried.

I built one in 1970. It still works! Never had a problem. I also have a Q multiplier for it and that also works. These were awesome kits.

Hi ,jeff i am watching you from rapp(rawatbhata).

That VTVM is a very useful piece of equipment. I have a Heathkit V-7A VTVM, I restored it and it's in excellent condition. I'm using it to align radios, I too am a ham operator. A good VTVM is as useful as a good oscilloscope.

I think the solderless breadboard is the same size as the separate one you showed, minus the snap-on power rails. Visually it looks small, but once you deduct the power rails you have the same number (or very close to) of tie points available.

Excellent idea and very easy to follow explanation!! I have two Heathkit VTVMs models IM-11 and IM-18. will work on them to change to self powered for resistance range.

Harmonic on most band are not a feature but a side effect of a simple or weak design. This problem is cause by too much feedback to allow to cover a wide band.

Great video, thanks from England

Did you ever upload the manual? I just ordered One of these from eBay in unknown condition other than it powers on and could use any information your willing to share!

Excelente!

Turn this generator to regenerative receiver.

From inside is sou ugly

lot of car devices had "grandpa of Pi/Arduino, Motolora 68332 microcontroler based on 68020. Do You know what software theryre running on?

Dear Jeff, if possible, I would like to receive the Signal Generator Heathkit IG-42 manual in PDF via email Thank you, Fernando - Parnamirim - RN - Brazil..

Your presentation was very informative, I remember the CB Radio craze I was into it Radios, Towers and Mic's. D104 and the "Screaming Eagle" Radio with a set of "MoonRaker's " thanks !

FWIW, back in the late 70s, there were two major chip-makers with "MOS" in their name; MOS Technology and MOSTEK. In my world at the time (electronics/computer engineering) everyone I knew or heard from (including the people at these companies who would answer phone calls) pronounced them as "em-oh-ess technology" and "mahss-tech". At least in my own experience, it has only been in more recent times, when a lot of people who were not in that industry at the time, or where simply too young to have been involved, have come up with different pronunciations. Kinda reminds me of electronic hobbyists these days who say "Jam-ee-co" for Jameco Electronics, because that's what it looks like and they were not around back when that company as called James Electronics and know to call it "Jame-co."

Are there any Transistorized Q multiplier devices?

I built many of their kits . . . test equipment/audio/RC/TV's. My scopes and meters still work after 50 years.The Heath TV's were excellent, I built a 25", 13', and 19' before they were bought by Zenith. When that name went on, the quality went down! Our 27" Zenith came with all the boards and harnesses assembled in Mexico . . . not as fun a project or with the quality components of the Heath sets. On first power up, it kept blowing the circuit breaker. On examining the schematic, I found that the power supply harness was assembled wrong. The Tech at the Heath store said they had a whole production line like that causing much headache!

Very Well presented Video!! Clear and precise explanations. I look forward to other pieces of Ham Radio Equipment you may take the same approach with. THANK YOU!