Відео

That wire is an antenna, which provides feedback from the secondary e-field. This way there is a feedback loop running which keeps the primary driver circuitry in tune in real time.

Take it to a tech

Yes. I don't have a lot of KNWD experience but so many friends are big fans. I have seen many TS-850S with missing fluorescent display sections, and am aware of that common failure. The TS-520 with its solid state rx and tube finals does indeed feel magical. I'll probably buy another one in the future as I sold two parts 520 at Dalton, GA hamfest last year. Just too many radios, too little time, plus mine lacked the cw filter. I reallyvdo enjoy bug sending on the 520 via grid block keying. Happy hamming! KI4DBK

@ki4dbk my primary rig is a Yaesu FTdx-3000d and is probably my legacy rig. It's amazing too, plus I have an now old Icom ic-746pro , I know what you mean about too many rigs, not enough time. All of these are plenty of radio for me. I started hamming with an old Heathkit HW101 and two Heathkit "lunchbox" rigs back in the late 70s & early 80s so these new rigs ( to me) are more than enough, especially my 3000 its like going from driving a car to flying the space shuttle lol! These older superhet receivers are ( to me) the bees knees. It's up to old goats like me to keep them running

​@l.a.2646 : I am 50 years young this year, but I prefer boat anchor work now, as my eyes are already shot and prefer point to point soldering and pouring through 1940s RCA Victor tube manuals. I've built the schematics in the back, have a tube stash at home, and am a 100% self taught maker/engineer. Thank you for commenting. 😊

​@@brettmiller5443that's fantastic! , I'm 54 and I know what you're saying about vision troubles. It's great that you keep those radios running. With my tube equipment, my troubles are finding and keeping the tubes at the ready , I lost most of my tube -radios& test equipment in a bad divorce, her brother wanted it. Tube gear was how I cut my teeth with electronics, plus my old man ( WW2 generation- he was 51 when I was born) was a self taught technician -radios and TVs had a lot of tube test gear and he had boxes full of parts, so I was able to learn from him and keep my stuff running. Keep it going! One Heartbreaker for me is, my kids have no interest in my radios or test equipment. 73

Oooh! The leakage 😢 but... that beautiful sound when it DOES run!!♡ just wonderful

​@wild-radio7373 I am going to have to redo the brazing on the bottom of the copper shunt/patch. It's easy for it to get dirty since oil and h20 bubble up from the cylinder/piston assembly. I'll have to de-grease, dry and re-score, sand. Tnx for your observations and in engineering, criticism is *GOOD*.

Yes, they are high speed diodes, such that they can stop a polarity reversal faster than most chunks of Si. Cant recall the part number, but i think i salvaged them from old PC power supplies.

Thanks. I got this great engine from my pal Dan, who spotted it at a yard sale. After some searching on the net, it turned out to be a bohm still available at: www.boehm-stirling.com/en/ I should add, that the manufacturer does not recommend adding oil to pre-assembled units. For kits, they recommend a specific oil.

Thanks. For sure these are fun. I'm now highly motivated to design more of my own, after getting my feet wet on a few simple soda can Stirling builds a few years ago. Time to start saving up for a metal lathe, or at least a small hobby lathe. 👍

I donated it to another ham and he sold it. I do have the 3 cw filters available for trade or sale. They may end up at my table at the next hamfest "boneyard"

@@ki4dbk I would not do that.....someone gives you something...you hang onto it.

I put Electro-Harmonix (rebranded SOVTEK?) 12ax7s in there and it rocks. Didn't have time to play bass much until some lately, this year, and my skills are improving. I got the cage pattern down on guitar after mostly being a rhythm guitarist over the years, and so some minimal scales on the bass are coming easy and I play with a pick. But the head sounds great through a 2x10 closed back.

Tnx. Just something I learned to do back when before KM4BI was SK. Used a righ handed Vibroplex in each arm. I would like to get my hands on a left handed original standard, deluxe, or presentation..Blue Racer.

@Chaz: Yes!!! I was so fortunate to buy mine from a nice guy in Dalton, GA who had Xeroxed the original manual and included it in the 10 dollars he charged for the tester. When I got home, just as he had promised, it worked great on a 5881 I plugged in, then next a few 6V6's. The rolling paper tube/settings chart was mechanically intact, as well as the backlight lamp behind it. Thanks for sharing!!!!

@@ki4dbk Cheers on a great find

Yeah. I have the project of putting porcelain octal sockets and point to point wiring on my 2nd carvin chassis on hold. Being doing more ham radio lately in my spare time than guitar/bass but it'll come back. Always does. I love the clean channel on those Carvin heads. It's decent as a bass amp too, and the slider E.Q. is nice to dial in your bass tone. I'm not surprised about that PCB getting smoked. Both my Carvin PCB's have scorched and darkened circuit boards.

@@ki4dbk honestly just mounting the on the chassis works wonders lol

Cool!!!!

I used electro-harmonix, but there are a plethora of 12ax7/12xxx audio preamp tubes you could use. Use your datasheet first, then your ears, imho.

Agreed. Thanks. It turned out a fellow I sold this to (with filters and all) sent it back, complaining about the tuner quitting. It worked for me but was making an awful racket. He had other complaints so I refunded the ham's money. At least I have those nice KNWD CW filters. I work 100% cw, but mostly rag chews and sprints. 73!!!

Thank you so much. I actually have passed this project to another ham friend who has traditionally been a bigger KNWD fan than myself, though I really enjoy my TS-520, at least when I'm in the mood to play the Vibroplex bugs around on the air. I always felt like the high voltage involved in grid block keying pretty much self cleaned oxidation off of the contacts of vintage bugs, and the ts-520 then has those nicely weighted punchy sounding dits.

@@ki4dbk thanks enjoyed your video. recently got a used 850SAT and the tuner is taking 90 seconds trying to find a match. I eventually just stop the tuning process. i'm not sure what's going on. also wondering how much difference the narrow CW filters make in addition to the 500 Hz ones. currently only have the 8.83 500 Hz CW filter installed.

🐓

Yeah, but I think there is something wrong with the audio on my individual TS-850S. It could be the CAR. Board or some part of the audio amp. Seems to clip very early, even with the external speaker attached. With this Workaround, I can keep the knob at around 9 o'clock max and I have plenty of distortion free headroom (within the Yamaha's 40w power amp) plus bell like cw clarity.

It's full bridge rectification right off the mains (Variac 0 - 140vac) with 420uf of filtration. I was using a signal generator (set to sync TTL) into the enable pin of the gate drivers as an interrupter in this clip.

"Correct-ness" wasn't the goal. Teaching myself how to build amplifiers is. Mission accomplished in spades. Yet, I would love to hear your criticism point by point. In engineering criticism is gold. Thanks in advance. There are many young people today who think criticism/negative feedback is bad. Every single one of them is wrong.

...looks like you have something nice going on with possibly an RK-71. No videos yet. Please share when you get the footage. Update: He never shared anything, and didn't back up his words with empirical evidence.

I typed in the wrong value in the calculator in the video and skewed the result, but the method is sound. I'll redo this video soon.

Thanks. It's a first for me on getting all that working in a chassis. I may actually rewire the power supply, which is very sloppy imho, and also in too close proximity to the signal path. I may go back and install shielded wire (grounded on one side of shield) on the input, but it's only like a 1.5" run.

The 6N1P project I want to do is a Single Ended KT88 driven by that tube. Bluelab Electronics has a great 6n1p/kt88 build. That guy's a real pro.

The restoration you're doing now of the reel to reel 2x6v6 amp is what I'm interested in via your work.

@@ki4dbk As soon as I get another POS NOS 6X5 I hope to continue on it's road to recovery and glory.

​@@diydan-kd2ynd63Dan did you ever finish that thing with the new rectum fryer, oops I meant rectifier.

It's a great radio, and I'm getting more excited about it every time I use it. I will probably get the 270hz filter next.

@@ki4dbk I'm glad you're warming up to it. You can't beat the price!

I'll be happy to make some of me strumming chords, since you're interested. However I am recapping the cheap filter Electrolytics with F&T's, soon...perhaps tonight. Wife willing and if I'm not too tired, I'll get that done and filmed and goof around with my Yamaha Pacifica "Strat" to test everything out. I may need to mic the cab for decent recording, as I made an Ampeg retubing video and played bass recording via Android and tripod, but audio quality was poor imho.

Timmy - As soon as I get a 2x10 cab for mine in a month or two, I can make an audio clip for you with my sm58 and audacity/linux. I don't have a 350w cab currently and don't want to run mine with no load on the poweramp. If you want to send an sm57 (proper cab recording mic) and a loaner cabinet, I can make it this week. Yet, I have found, I can't purchase a guitar or bass amp based on a sound clip. I have to actually play through it for a while and crank it.

I got mine in 2003 and never looked back. It was used when I got it (obviously) and I used the crap out of it until Covid hit. No issues, clean Ampeg sound! I've run it through single 15" 8 ohm (200w), dual 15" 8 ohm (350w), a 4x10 8 ohm cab, a combination of 4x10 & 15" and have never had a problem. It's actually 200 watt & 350 watt, not 250 & 350. Also, since the output is solid state you do not need a speaker cabinet to work on it. That is only an issue with tube & output transformer setups. You also don't need a cabinet rated at 350 watts to use this. I have run it through a 50 watt speaker at low volumes for testing. I've been an amp tech since the mid 80s and a bass player since 1977.

@@jimolson2557 Yeah iam familiar with how solid state work, but the Ampeg cant run 2ohm right? I got two offers, a Ampeg SVT 3 and a sunn colliseum lead. Both are same price and will be for guitar driving two 15" elements at 1000w @ 4ohm. But sadly person that sells ampeg has sold speaker so cant try it before. Someone told me the sunn solid state would be better for guitar, but yeah both seems awesome. If using Ampeg as a "power amp unit" can you still use the EQ or are that prior to the FX return?

@@timmysvensson4902 - The EQ is for the preamp section, once it hits the power amp there are very few amps out there that use any type of tone controls in that section. And no, 2 ohm is not recommended for this amp. For a few minutes of testing it won't hurt anything though.

That's a toss-up too, both amps are good but I would prefer the Ampeg for bass. If you want clean and loud the Sunn is hard to beat.

Shorts get the most views for two reasons that i can guess: 1. Folks have destroyed their attention span via garbage like tiktok and twitter. 2. UA-cam forces a barrage of short content on their average user. But those are guesses. ....i remember trying Odyssey. Totally worthless, plus everything was broken and 99.9% of content was hypnogogic hallucinatory fodder for teen kooks on psychedelics.