This bucking idea is interesting. I also did the choke in the negative lead as a check. It worked, but a bit more ripple so I went back to conventional.
@@MIKROWAVE1 It has an issue by changing the filament voltage. That is why I removed that portion of my original content. The extra winding can be used to buck or boost.
I went when I was 16 in 1973. Caught my first trout in Lake Kluane in the Yukon. Fished the Kenai. Just my cousin Chris 14 and my uncle who took us for 6 weeks. Nobody was there fishing. Just us and a million salmon.
The mark II power supply really isn't a choke input, as the two capacitors connected in series for the voltage doubler are the input capacitor for the filter.
In would replace 6cg7 with 6ab8/ecl80 and would adjust circuit for that tube. 10K output tranny is alredy there. With good speaker there would be a lots of volume. I think much more than with 6cg7. Or 6ab4/6ak5 in output, but that would increase tube count. I like to use historical ham speakers that are not small and give beautiful sound. Althrough 6cg7 sounds good, did not expect that. Great work!!!
Agree that a Triode Pentode would give more gain. There are many choices here to that would fit nicely. The 6CG7 is a fine tube. I used one in a White Cathode Follower for a headphone amplifier I built for a friend with a 12AX7 preamp and feedback like a little op-amp for each channel and it sounded like a million bucks according to him. And he is a headphone only freak. He sent me a pair of AKGs as payment!
@@MIKROWAVE1 There is no question about it, 6CG7 is a fine tube, for phase splitters, headphone amps, driver for large triode amps, measuring gear, you name it... It also works well in Twinplex.
Once series is completed will you upload your complete schematics including updated parts used and coil winding details? Also might be of help for others I've built a few tube amps in past and for power supply I used PSU Designer II software which was free, might help others to tweak their parts for the power supply.
Nice Audio design using essentially a 6SN7! Just how much audio RMS watts are you getting out of the 6CG7 tube, probably flea power, may be 500 mw. That tube if used as push-pull would get you about 1 watt RMS output.
Hi Mike, Happy New Year! I am enjoying your build of this radio, I built the Mark II a couple of years ago and it preforms well. Sourcing the parts was a big part of the fun for my self. It took a while but I was able to find NOS Miniductor coils for the front end and oscillator circuits, and used NOS J.W. Miller 4400 series parts for the IF. I followed the Mark II build and used un-shielded IF coils. I do have some leaking of the IF signal around the crystal filter ( 1.710080 Mhz crystal ). If I remove the Crystal from the circuit I still get audio from the station to which the radio is tuned, although at a reduced volume. So I will be curious if the build you are doing with the shielded coils has better isolation, I think that it will. I am looking forward to the next video. 73 KG4RLL
Hi good job audio sounds good i will wind all the coils for my build now the holidays are over i should get the parts i am waiting for and the chassis i got a project fot you how about a valve transverter for 20,15,10, you Can plug in to the receiver happy new year chris g0wfh
It's always a relief when it emits a hum:-)
HNY Mike and all the best for 2025
Steve M0KOV
С новым годом! Здоровья и творческих успехов!
I went to Alaska touring with my wife and then fishing with a friend last August. It was great!
This bucking idea is interesting. I also did the choke in the negative lead as a check. It worked, but a bit more ripple so I went back to conventional.
@@MIKROWAVE1 It has an issue by changing the filament voltage. That is why I removed that portion of my original content. The extra winding can be used to buck or boost.
@Chris_Grossman the 6.3V is running high too. Most of these old transformers run high with modern AC voltages. So I still think your idea is valid.
I went when I was 16 in 1973. Caught my first trout in Lake Kluane in the Yukon. Fished the Kenai. Just my cousin Chris 14 and my uncle who took us for 6 weeks. Nobody was there fishing. Just us and a million salmon.
Sharing the first sounds of a new build- Happy New Year!
Great Information!
Great series... love this build
Thanks for following my build. Wouldn't it be great if it works?
👍 Audio sounds very good.
Well we shall see. Hey its just old guys talking!
It's always good to put your finger on stuff just to verify that HV is present. :)
Congrats Mike , Happy New Year !
The mark II power supply really isn't a choke input, as the two capacitors connected in series for the voltage doubler are the input capacitor for the filter.
It's a Pi filter, and the peak voltage has already been set by the doubler as you are saying
There is some R loss through the choke.
Looks great!
It's coming along. The BFO and Detector are in now. Video coming.
Happy new year
In would replace 6cg7 with 6ab8/ecl80 and would adjust circuit for that tube. 10K output tranny is alredy there.
With good speaker there would be a lots of volume. I think much more than with 6cg7.
Or 6ab4/6ak5 in output, but that would increase tube count.
I like to use historical ham speakers that are not small and give beautiful sound.
Althrough 6cg7 sounds good, did not expect that.
Great work!!!
Agree that a Triode Pentode would give more gain. There are many choices here to that would fit nicely. The 6CG7 is a fine tube. I used one in a White Cathode Follower for a headphone amplifier I built for a friend with a 12AX7 preamp and feedback like a little op-amp for each channel and it sounded like a million bucks according to him. And he is a headphone only freak. He sent me a pair of AKGs as payment!
@@MIKROWAVE1 There is no question about it, 6CG7 is a fine tube, for phase splitters, headphone amps, driver for large triode amps, measuring gear, you name it...
It also works well in Twinplex.
Once series is completed will you upload your complete schematics including updated parts used and coil winding details? Also might be of help for others I've built a few tube amps in past and for power supply I used PSU Designer II software which was free, might help others to tweak their parts for the power supply.
I always do. I will put the detailed information and high resolution schematics on my Patreon Channel.
@MIKROWAVE1 Thanks I'll keep an eye out.
Nice Audio design using essentially a 6SN7! Just how much audio RMS watts are you getting out of the 6CG7 tube, probably flea power, may be 500 mw. That tube if used as push-pull would get you about 1 watt RMS output.
I have not checked. Must be low, but enough for tabletop audio.
Hi Mike,
Happy New Year!
I am enjoying your build of this radio, I built the Mark II a couple of years ago and it preforms well.
Sourcing the parts was a big part of the fun for my self.
It took a while but I was able to find NOS Miniductor coils for the front end and oscillator circuits, and used NOS J.W. Miller 4400 series parts for the IF.
I followed the Mark II build and used un-shielded IF coils. I do have some leaking of the IF signal around the crystal filter ( 1.710080 Mhz crystal ). If I remove the Crystal from the circuit I still get audio from the station to which the radio is tuned, although at a reduced volume. So I will be curious if the build you are doing with the shielded coils has better isolation, I think that it will.
I am looking forward to the next video.
73 KG4RLL
Wow this is great! It is so encouraging to hear of so many that have built this radio and have experience.
Hi good job audio sounds good i will wind all the coils for my build now the holidays are over i should get the parts i am waiting for and the chassis i got a project fot you how about a valve transverter for 20,15,10, you
Can plug in to the receiver happy new year chris g0wfh
Hello Mike - fabulous job. When the receiver is finished I would like to purchase it if you would like to sell it.
Why did he say, "please copy?" You have not answered my last question on email on rotors. Do you use elecro lick its?
I am not a rotor guy. That AC stuff is Magic. What are electron lick its? Sounds dangerous. Don't be licking stuff.
@@MIKROWAVE1 You know more about ham radio, even rotors than I do except marketing. Electro lick its are polarized capacitors like 40 uf.
I see what you did there...
Electro-it-iks😂
@@OIE82 Smarter than Mike.
Great Information!
Thanks Jack!