The Electric Mistress Repair

[@JasperJanssen]

“Fuck! That was hot” - the universal soldering experience.

[@jacekp4740]

Parallel lessons to electronics: heat conductivity and heat preservation

[@jimviau327]

Happens to all of us 🎉

[@zombiesateourchannel]

I was thinking exactly the same thought.

[@SkittleKicksPlays]

You're an amateur if you've never burnt or melted skin from soldering. LOL

[@GooseYArd]

getting to hear Mark swear on camera was worth the wait

[@johnburns5783]

Wow, not only an electronics genius, but Mark also plays guitar 👍👍👍

[@DalmaTon-Records]

Yes, I was impressed, he's awesome!

[@LordBumSniffington]

Shreds, slays, treats the women right,

[@jhareng]

Inspired by Kirk Hammet

[@andrewwturner]

I must admit I had a Bubbles moment there.

[@godsinbox]

soldering skills say this is no genius. also why does circuit say copyright ralf metzger, and nobody notices the breaches of IP.

[@hpd385tannoylover2]

Great diagnosing, innovative solution, coupled with the skills of high level artisan. And a musician to boot. So glad Mr Rossman put me on to you, Mark.

[@vicroc4]

Louis' video about that takedown seems to have led a fair few people to Mark. Which he deserves tbh.

[@roxxliveracing2039]

Watching People actually manefacturing stuff instead of buying or outsourcing is awsome!!!! please more!!!!

[@mauriciobeligolioliveira]

Before this channel, you couldn't easily find it all together in one person: knowledge, charisma and sensibility. Mr Mark, you're all of those things, your channel is one of the best here and I look forward for more from you, sir. Well done!

[@xeroidkid]

Is there no end to your talent. I’m very impressed with your efforts on this one Mark.

[@robburbrink8277]

Etching your own board, finding a functioning chip replacement. You're a beast Mark , thank you! I've been watching your videos for the last several evenings

[@dmikelyn]

A meticulous approach that borders on the driven. An electronics bench that would be any “electron basher”’s wet dream. An intricately informed knowledge base of all things electronic. A consistently sunny disposition that is a pleasure to behold. And he’s a musician! I know nothing about electronics but I keep coming back. And I have actually been learning!!! Please accept this humble Canucks profound thanks for all that you do Mark. Cheers mate!

[@kenp9073]

Any machine you don't have?.... lol Thank you Mark for letting us walk along with you on these projects. Sorry about the fake chips. Really enjoy watching you work your magic. Thank you from the US!

[@paulperry7091]

Just what every electronics workshop needs, a test strat.

[@PTguitars]

I can build and troubleshoot electronics, and I have a lot of fun with it. However I can testify that Mark is on a completely other level. Great to witness this proficiency. I am also impressed with the cheerful easygoing attitude. Cheers Mark

[@peterhyams6824]

That’s why I loved fault finding as nothing quite replaces that buzz you get when you switch something on after a repair and it works ! It takes a certain type of person to be a technician. It’s addictive lol. The more complicated the repair the bigger the buzz. At nearly 70 I can’t do delicate work anymore due to trembling hands and it’s so annoying, but I still have all the test gear !

[@mohammedisaa9952]

@peterhyams6824 Just a thaught....... you could consider teaching a youngster who wants to learn, and he/she could be your hands? Im sure you could still get work if thats your profession, as mentoring someone is as though you continue your work through someone else, and eventually you could hand over your business to that person who would continue to provide help to your community 🙂 ?......

[@janskeet1382]

“Night after night, who treats you right?, Baby, it's the guitar man”. 🎸

[@andrewdolinskiatcarpathian]

I demand Mark plays a guitar outro on every future video. 👏👏🤞🎶

[@IainShepherd1]

When he does old radiograms etc. I wish he would run the intro music through them for an outro. 🤣

[@mikecumbo7531]

This video brought me back to 1982, I was taking an electronics class at college and we had to design and etch a rather basic circuit board and then build some device. Radio Shack, in the US, had everything I needed. There was a marker like pen that put a resist compound on the board, that created the traces. Any copper that didn’t have the resist marker would be dissolved by the acid.

[@1011010100011]

I have the same childhood experiences, circa 1978 age 11ish. I learned later that the "special" Radio Shack PCB resist pen was just a normal Sharpie marker, marked-up by 500%. That was possibly the most valuable lesson!

[@Ray_of_Light62]

A manually routed PCB... Like it is the end of the '70s! The effect of such simple delay line is unbelievable. People from the Far East should make a production run of such ancient chips, as they use the same technology of RAM memory - instead of falsely marking random chips as they were BBDs. I stopped purchasing components from eBay, as the sellers, too often, are either scalpers or fraudsters. Thank you for this video, Anthony

[@nakfan]

“Better discharge the static…Not that there is any in this country” 😅

[@PaulHigginbothamSr]

Static in every country and your country shines out in fiddlers, guitarists, unt Der flooglewelt.

[@SteveInQLD007]

Never seen handmade pcb's before - I've just been educated AND entertained! Thanks man, you're a modern day McGyver!!

[@Gone-cf4fj]

i don't know if you noticed, that at 21:31 , the real one reads: R28690 and the fake one reads: R82690 reversed two first digits ? very interesting to see you work everything on your own, very inspiring thank you.🤓

[@joeguitar7164]

Wohoo, the bloke can play the guitar also 😅great work Mark! I've got a broke T-rex Roommate laying around but seeing this elaborate endeavour I reckon the repair costs will surpass the value of a new one by far....🤔

[@scottaumann]

The counterfeit market makes things super frustrating! I loved that you made your own PCB for the replacement.

[@66Gollum]

Wow, this man knows what he is doing! I miss you very much in my neighborhood !

[@Wil_Bloodworth]

Just when I think you cannot impress further, you push the bar even higher. Your channel is a never ending source of education and entertainment. Thank you for taking the time to make these videos Mark!

[@wlrIII]

Thanks, Mark. I love your presentation style and excellent production qualities. Cheers!

[@MendItMark]

Thank you very much! I’m due to film a new one over this weekend- I haven’t decided what it will be yet, there’s no shortage of gear to fix! Cheers! Mark

[@tbonky]

Glad you liked the T strippers! Ideal entered the market with abrasives for DC armature maintenance and branched out. Glad you got some nice sounds out of the Mistress.

[@morph-the-cat]

It’s always a great day when Mend it Mark uploads a new video. Thank you!

[@anthonybarra2391]

watching you work your magic, i regret not getting into electronics when i wanted to, as a young electrician apprentice. Now im just a sparky, but playing at fixing amps as a hobby, learning from you at nearly 50. Thanks Mark

[@DonaldVanHall]

TThe flanger effect is a sweeping comb filter of the input audio. Since the SAD 512 is functionally 1/2 the delay length of the SAD 1024, using it at the same clock frequency will give 1/2 the delay time. This causes a comb filter sweep over a narrower and upper frequency area of the input signal. Use a sweep waveform from 100 Hz to 15KHz to see the comb filter effect of adding the delay to the dry signal. The shorter delay causes the flange effect to work over a higher upper frequency area of the input audio range. With a 1024 step BBD the flanging effect is more noticeable over the lower frequency range of input audio. Sweeping the filter low enough in frequency causes the filters lowest notch to be described as "going through zero(Hz)", or down to 0 Hz. You could reduce the clock frequency to increase the delay time but the lower clock frequency causes aliasing of the audio signal. Nice job of creating the Reticon conversion PCB with an OG method of circuit board etching! I was shocked to see the PCB mechanically supported by the potentiometers, not standoffs from the chassis. AC transformer inputs and outputs too long, not twisted and routed away from signal areas. Twist ties with embedded wire laying against the trace side of the circuit board. Things were done differently back then. But who would've thought that pedals would still be in use?

[@ianinvancouverbc]

the Electric Mistress was/is a classic pedal in its day, I think the guitar player in my band had one circa 1980

[@ShR33k]

Is there no end to your talent ! Last video I saw you replaced the writing on a Technics amp as the cleaning foam you used erased it off the brushed metal plate on the front! And now you're designing PCB boards and replacing an IC and using a modern equivalent - somehow making it work! Then to top it off... a bit of guitar at the end! Genius! Wished you were closer, I'd love to come to your workshop just for a visit - and maybe learn from the master!

[@СергейГорбачев-я3г]

Подумал - Сашка Лаэртский, ан нет. Но когда в конце заиграл на гитаре - засомневался ) Спасибо, вы очень крутой спец!

[@Fishfingersarnie]

Brilliant! Love watching your repairs - its the chuckle that's the icing on the cake!

[@joshfreeman7999]

Im so glad i found this channel. Please more of these. So cool.

[@russellforrest1730]

I know that feeling when you plan and prepare everything, but at the first switch - things don't go to plan... Kudos for sticking with it and working out the solution!

[@malrex0mari]

Wow solid work! 😀 Lovely bringing a device like this back!

[@pebbleschan6085]

11:12 Thanks for the great tip of floating the non-drilled single sided PCB on the etchant!

[@TheGuitologist]

Very nice repair! Clean. Great video!

[@rvmeushaw]

As usual - very clever and resourceful repair. I think I might have added a power light as a bonus.

[@mohammedisaa9952]

A 12 volt led doesn't cost the eart, and a hole isnt that akward to drill with a "splodge" of glue 😂😅😂😅😂

[@fogbullit1000]

Hi Mark, as a fellow engineer from Walsall I just wanted to thank you for the enlightening videos ,keep up the good work, every day is a school day 😆👍

[@plunder1956]

That old peddle has a nice warm sound to it. Your nice little modification board was the most interesting bit of that process. Nice work. You have a lovely workshop, it would be interesting to do a little mini- tour of it in a video one day. BTW - I love your guitar, lovely colour.

[@phatwayne]

That really took me back to my CDT lessons, I loved making printed circuit boards like that 😊

[@tndabone]

Seeing you make that pcb brought back so many memories of me learning how to do that back in the early 90s.

[@elsaarmstrong-zp6ng]

This is more like a manufacturer workshop ( milling, drilling, fabricating etc). He must be a genius!

[@ianpritchard6375]

I've watched many of your videos Mark .. and there's always another bit of kit! Wire roller ... chip straightener - awesome

[@TheFreemanuk]

When i was 4 years old i would find screwdrivers and take everything electrical apart in the home. Now at 58 i watch your videos and it relaxes me more than anything on the internet. Thankyou for sharing your time x I have a technics sa 600 hi fi amp ive had for 40 years can you have a look at it ? x

[@floppydisk921]

Who would know that one of the most involved repairs I've seen you done would be of such a simple circuit! Always a pleasure to watch your vids Mark

[@marktubeie07]

... and you're a muso as well! I'm more impressed every day Mark 😆 Possibly the most impressive tech repair channel ever mate, love your work!!

[@FretNoMore]

I have no idea why this popped up in my suggestions, and not really my main interest, but stayed 'til the end. Quite enjoyable to see the debugging and repair!

[@JH-si9oe]

Hi , I just want to say how much I enjoy watching , you are brilliant at making the very technical repairs interesting and fun.

[@cmflyer]

Every video, new tools and techniques. And now guitar! Awesome!

[@trippntrev]

Jasus! As always an amazing repair and engineering work Mark. First time I’ve seen you play, no end to your talents. You’ve opened up a big can here Mark with your work around. You’ll be bombarded, I’d like to jump in first, will you make me one of those boards for my HH Clockwork Concubine, I’m on my last 1024A Might try buy some 512s as spare. Keep up the brilliant work. Thank you Trev

[@umbertoyltp]

I am impressed with your road to succes towards half a Mistress with satisfying result!

[@victorious436]

I was quite suprised when you got the guitar out and made a good effort at proving your work... I probably shouldn't have been as there really is no end to your talents. Thanks for another good video and the "fuck that was hot" moment made me chuckle and just proved you are human 😊

[@tim0steele]

The fake chip has marks on top showing the original top surface was ground off. The half moon indicating pin 1 is also shallower than normal. Amazing effort rolling wire to make flat pins!

[@paulmichaelfreedman8334]

Not as consistent but an iron strip and a hammer will also do the trick. But Mark's way is more elegant and professional.

[@tim0steele]

@@paulmichaelfreedman8334 You could also use a socket with long pins

[@paulmichaelfreedman8334]

@@tim0steele I'd have just made them longer and soldered them into a vero board, them solder the pcb on the other side of the legs, and snip off the legs to the right length. But to each their own of course. Mark's skills are top notch.

[@robinsutcliffe_video_art]

known as Blacktopping : /

[@JamieTyson]

I have been wondering for years if i could put an sad512 or other reticon 8 pin bbd in my old DOD chorus. It was amazing and instructive to watch you walk through the process! Thanks Mark!

[@johnmac8084]

Fantastic repair Mark, including custom PCB for substitute chip, I'm impressed

[@mitchgray8413]

Mark, Really happy that you found the wire strippers useful! I've had a few Electro-Harmonix gadgets in my rock-n-roll days. LBP-1, and a Mike Matthews Freedom amp. Freedom because it also was battery operated. Mike Matthews was the founder of Electro-Harmonix back in the70s. Thanks for the acknowledgment. Solder on!

[@kazookie1567]

I just found you here a week ago. Now i watched some of your brilliant videos and i am blown away! You are doing stuff I can't even comprehend and i feel humbled by the fact that i am allowed to witness such ingenuity!

[@JonDoe-zi3mh]

What an amazing fix. Found your channel recently and am loving it. Real hardcore techie stuff.

[@dryroasted5599]

They used to make DIP socket extenders like you made; sixteen double ended posts held together with PE plastic. Don't know if they're still available, as I haven't done bench work for years. It's good to see I'm not the only one that clumsily burns myself. I hope your customers appreciate how far above and beyond you go.

[@TexasGit]

The SAD1024 is virtually unobtainium. They sound great for guitar, though. I've made a pop-in replacement using more modern chips, as have others.

[@mjouwbuis]

They're obtainable, just not at a pricepoint that's comfortable for people who don't really, really, need them.

[@andrewrutter5753]

Love to read those schematics with you. Takes me back, very very satisfying.

[@marcustait79]

Man I did not predict that a home made circuit board would be part of the fix! That’s truly next level stuff! I’m sure you have no shortage of things to work on but the guitar community are predicting a huge drop off in the number of people capable of repairing tube amplifiers in the next few years. Would you consider making some content tackling common issues associated with guitar tube amps?

[@iansmith427]

Nice on Mark. Another great fix. Just like the days of Deritend Regards Ian Smith.

[@giovanniconti9335]

...you can also play guitar. That's awesome. I've been watching several videos. You are a GREAT technician. They are hard to find anymore. You have great equipment and great instruments. Congratulations.

[@markmooch]

Always impressed with how fast you can screw things in

[@LambertHeenan]

Excellent diagnosis/fix. One year late, and perhaps already mentioned, but I noticed when you compared the original SAD512D with the new one that the "R" designations are not the same. "R28690" compared to "R82690" for the new one. Is there any significance to this I wondered?

[@drewwade9640]

You are a pretty incredible dude. You've reignited my love of electronics, that is, the knowledge of each component, identifying circuits. Keep up the good work.

[@em-dashman4404]

What an absolute pleasure to watch somebody who actually knows what they’re doing 😎 Shame you’re maxed out with work, Mark - I’d love to send my old EHX Deluxe Memory Man in…

[@bretfuzz925]

I have the pedal he just reworked and the one you have. Both have dead or seriously compromised sad1024 devices. I went down the rabbit hole 10 years ago. I have since purchased new pedals to replace their functionality. I’m still hoping some crazy person creates a compatible drop in solution.

[@endrepinter357]

Always impresses me and admire your professional workshop equipment and your creative skills it's simply amazing! Greetings from Budapest, Hungary :)

[@DominicClifton]

to align all the legs before soldering them you can use a spare socket and press the legs into the spare socket and then solder all the pins at the same time.

[@eviain]

This video has everything, really nice repair job and a chilled guitar solo at the end, great job 👏

[@trojanorse]

Multi talented, very impressive. Thanks for the great videos Mark. Keep 'em coming.

[@frankstone919]

It's fascinating to watch you repair things. Thank you for sharing such a entertaining video.

[@arlo0011]

I used to work in a small music store in the 90s, and I had to deal with very similar repairs as this one. To be honest, I would have just hard wired the different chip with jump leads. Crude, but effective. I like your way better.

[@jordangibson695]

I had no idea chips were so expensive to the point of being counterfeited. Seems like all these old electronics that we throw out could be harvested for a cottage business.

[@enryfrank]

It's fascinating to watch you repair things, thanks for your videos !

[@stevebarbier5602]

Is there no end to this man's talents ...........................................

[@thomasstone1363]

No 😊

[@bobfrankish8883]

Great video and job Mark. Donkey's years ago, a friend of mine gave me an old Carlsbro echo unit to repair , it was chock full of SAD1024's. I remember buying a load of them from a friend who was going to throw them out, I may still even have them somewhere, might be worth looking at 250 bucks apiece!

[@computersales]

I am slowly working through all your videos. Pretty crazy how many skills you have. Was not expecting you to be guitar player as well.

[@YTispartofproblem]

felt so bad for you mate when it turned out those chips were duffers but you have a really positive personality. I'd like to be more like that, it's a better than feeling annoyed all day which is how i would have reacted😊

[@sepposyXIV]

Amazed that you went straight to making an adapter PCB without testing the modern chip on breadboard or similar. You know what works right away.

[@jaccoonderdijk1777]

Respect, this brought me back some solid memories of lessons creating boards using nasty chemicals, awesome!

[@chrish7540]

Fantastic video. And especially lovdd the bit at the end where we got to see your impressive guitar chops. New subscriber. Loving your work.

[@stevenFL8245]

I love the channel! Sometimes you are talking, and my eyes glaze over; I have no idea what you are doing. I am learning slowly, and I have built some basic circuits. Thank you for the insight into repairing the unrepairable.

[@TornadosHandmade]

Watching this on the 1st of January 2025, the first thing I watch while drinking my coffee and what a surprise Oh, ho ho o ... and a nice little guitar demonstration. Love it, and everything you do!

[@mrmansville9340]

Your process for making these videos is spot on. I can't tell you how much I enjoy your work, Mark. The breadth of gear you cover is awesome I can honestly see you going a long way!

[@mariolafontaine5853]

You are the best as repairman and a good guitarist too! Louis Rossman made me check you channel. Both of you are brilliant repairman! Cheer!👍👍🇨🇦🇨🇦

[@TimHollingworth]

Thanks Mark for demonstrating your never ending skill. I remember spending weeks back in the 80's trying to build a bucket brigade echo from some magazine like Elector. It did work to some degree but it was never quite right in my head. Maybe I had a duff chip. Never thought of that one!

[@martf3129]

Hey slowhand! Great video, the most interesting to me so far, but then I haven't seen all of your videos yet) Loved the replacing one chip with another, and making the board for it

[@Sabre-X1]

Astonishing knowledge and skill - Brill

[@taswild1]

Gday Mark, bought a Caps set for my amplifier and a supplier from bulgaria, was fast and all looked fantastic, until I sent a pic to my brother who got the same only to be told by his elec tech they were fakes. 😢. Disappointing when you expect something for the money. Just as well we didn't get them soldered in! Enjoyed watching you vid. Cheers from Tasmania Australia a long way from Bulgaria!

[@1968madmike]

Mark, Thank-you for your response on your Cats name! I just started watching your video's and now I can't stop! So interresting. I have those wire strippers myself, Their awsome! I live in the United States, In a small town in Northwest Ohio Called Maumee. So your vids reach far and wide! Keep up the great work! Mike Z.

[@MaxStax1]

Some good fishing there during the Maumee River Walleye Run!

[@morrisbagnall2690]

Making the PCB was something I haven't seen before. Reminds me of being in the darkroom making prints. Fascinating.

[@Petertronic]

I wonder how much the genuine chip cost you? Brilliant repair video as ever. Best new electronics channel for many years!

[@jtbracknell]

Excellent Mark. Just found your channel and amazing work mate.

[@ChrisHopkinsBass]

I've got a late 70s, Mistress (the 2x9v) version that I got as my first ebay purchase back in 2004. Sold as "untested". When it turned up no sound. I found a pedal repair guy who thought the same as me that the SAD1024 was dead. Luckily the only issue was one of the 741s had died. He replaced it and it was good. I really needed to get that pedal down from the attic to test it as it's been 10-15 years since I last plugged it in

[@cakepanda]

Is there any limit to Mark's talents? Super impressed. Wish I had a tenth of your skills and knowledge!

[@Mister_G]

Fantastic - very well done & very well presented.

[@Amb3rjack]

Thanks