Відео

Didn't know that, thanks. I looked that Bose amp up, the series 2 schematics are the same with a few minor differences. SA were really helpful when I restored this amp, it was in a non working rough condition. It's an amazing amp being essentially two monoblocks & sounds sweet. TFW.

Thanks for dropping by. They are amazing valves & visually stimulating. The test set up is pretty simple but because it's a lashed test up, looks more complicated than it is in reality. You start as with any other valve with it's datasheet & research on the net. However, if your not used to working with EHT or very high voltages proceed with extreme caution. The valves produce a better glow the higher the EHT & the more current they draw. TFW.

I received your reply comment notification by email, however the comment isn't showing up here. First off what valves have you got? Stay away from those tfmr's everyone uses to get high voltage (maybe the reason your comment is blanked, don't mention the m word) A thyratron like any valve or transistor can work at different voltages & currents. Essentially they are like a modern SCR or thyristor. To get one to function you need three or four things 1) a low voltage high current tfmr to power the filament. 2) a low voltage variable power supply to control it. 3) A high voltage - ish power supply & 4) a load capable of handling the power switched by the thyraton. A thyratron is just a switch. Have you mucked about about with other valves like ECC83's etc? I'd advise figuring out how they work & get used to working with 300v ish first before playing with thyratrons.

@@diabolicalartificer Sorry about that notification. i don't want to come across as a bother. The tube I have. The thyratron is a Mullard CV372, hydrogen filled. ''CV372 tube'' into google it pops up on the Valve museum site. I just uploaded a picture on my YT post of it. The ECC83 i will get hold of. start small and work my way up.

@@Moth_of_Yuggoth No bother, I'll help if I can. I run the channel to share what little knowledge I have & for the love of vintage tech. The valve you have isn't an easy valve to start with. There are lower voltage smaller thyratrons I'd recommend you start with. That as well learning with small audio valves like the ECC83. See if you can get a few EF80's which are very common & cheap to experiment with. A variac & an isolaion tfmr together with a lamp limiter is a good investment to keep you safe. Also join a vintage forum like DIYaudio or the UK vintage radio restoration forum. There's lots of folk on there who will advise & help. Take care.

Aye, your right, this had me beat though. TFW.

Yeh, confusing. think your right about the datasheet, makes sense. I got a belt too last week on this amp, certainly wakes you up. I paint a bit of red nail varnish on exposed HV parts, it doesn't insulate 100% but does give a bit of protection.

This scope has had a lot of interest, didn't realise that it was that well known. Thanks for dropping by.

Bless you, as you say it's a nifty little scope & hard to find. TFW.

I've collected over years & been lucky, it's also down to contacts, & good friends. If your a vintage Tek nut, there's not many of us but if post on the various vintage tech forums you meet folk, we all help each other out & in the case of Tek 500 series valve scopes not many folk want a 24" x 16" x 13" scope that eats power & weighs 65lb's & takes commitment to keep running. You have to look too at places other than Ebay like local auctions. Lastly I'm a great believer in what you get out, you get back. I get given a lot of stuff but I also would rather give folk stuff for free than make money. If you want a Tek 500 series scope, I have a couple, contact me. TFW.

@@diabolicalartificer Thank you! I did have a couple of Tek 500 series years ago, but due to room constraints, sadly had to say goodbye to them. I retain a fondness for the engineering and functionality of them though. Yeah, I guess I don't use the forums so much, which as you say, is a good place to exchange kit. I hadn't heard of BWD scopes, certainly looks a useful beast for valve amp work.

Aye, good scope innit? Having a high voltage differential capability is very useful for testing valve amps, TFW.

"that black knob u touch @4:22 selects which channel it triggers" brilliant, thanks. Makes sense now you mention it. There's lots of ways to suck an egg, thanks for your contribution, much appreciated. These scopes aren't easy to figure out, hopefully those of us with them can work it out between us. Cheers.

@@diabolicalartificer Glad it helped :) allso if yours has the signal outputs on the back. There great i link them to my digital scope with right angle bnc RG316 coax leads off of aliexpris. was about £12 for 4 . pps beware folks theese scopes come with a few of the devils own RIFFA caps inside ... i had to " Exorcise " mine ;)

Thanks for watching.

Excellent ideas unfortunately I haven't the tool to crimp BNC connectors to cable properly. I've tried in the past to make BNC leads with solderable connectors but had very poor results. Great bit of test gear though eh? TFW.

@@diabolicalartificer If you use the copper shielded and copper center conductor RG58, no crimping needed, just some soldering.

Yep, it's a great way to make sense of a complex circuit. TFW.

Glad you got something out of it & chuffed you liked the thumbnail. I'm mostly on the ball but don't half make some daft mistakes sometimes/often. Cheers.

Your right, for a joint to be completely free of corrosion it has to gold all the way, but still after 60 years any joint is suspect. Your lucky you live where you do, the land of Tektronix & HP, easier to get stuff. TFW.

Thanks. I'm a lazy bugger, I'll try & look for obvious faults, but that only gets me/us so far. Sometimes I have to get off my arse & use my brain to understand how a circuit works, we're human, do as little as poss to conserve energy. If you put your problem on one side for a day or so, do some research, then go for a walk. I find my head works well when walking, for you it could be whilst knitting or something. Good luck.

@@diabolicalartificer Yeah, my mind works better when I'm not emotionally charged over what I'm doing......chill...it's all good...OM....

As you say it's a great little scope, made in Oz, got it for a fiver. It's not working 100% & not sure what some of the controls do despite having various manual on PDF; do you have a owners manual? Someone else I know has one in England, see - ua-cam.com/video/QJXpzKi9t98/v-deo.html . Thanks for your kind offer but I don't do patreon, I do it to help folk out & to share my passion for valves & vintage tech.TFW.

@@diabolicalartificer Hia ive got a ok ish scan of the schematic + a spec sheeht if you would like them

I'm chuffed (happy) you enjoyed the video & that it resonated with you too. I think there is an interest more at present in other ways of living. TFW.

Glad you liked the video. Might be a while doing the goat & skiing video's : ) Is that the UK EE or the Australian one? The Tek545B is a great scope, wise choice. If you keep it somewhere warm & free of moisture it'll last you decades. As you know the best way to learn to drive a scope is to have a play, but I'll see if I can do a video. I don't use the delayed timebase on mine much TBH, I ought to. TFW and all the best for 25.

@diabolicalartificer UK. It'll take me a while to get round to restoring it, but sometimes the journey is the best part. I wonder if any of the engineers are still around. To think their work is still being put to good use in 2025!!

@@stevehurcombe So, not working, ehm. Try to keep all the valves in place, test each power supply cap for leakage then power it up. If you need any help, let me know. I have a few spare plugin's if you need any. I think most of the old Tek engineers are long gone sadly. However there are a still quite a few Tek 500 series/Tek lovers about who know their stuff & there's a vast resource at w140,com & the Tek forum.

@@diabolicalartificer It's definitely a project, but that's what I wanted. It has character! There's a quick video intro on my "channel". I think it was with an RF engineering company somewhere around Litchfield.

Yep, sucker for punishment, at least I think that's what your referring to. Regards, Andy.

Don't put yourself down, plenty of folk in the world who'll do that for you. Everyone has something to contribute, only an idiot or an egotistical f u ckwit will dismiss your advice without consideration. The Flir camera, is, as you say an excellent fault finding tool, unfortunately the price is beyond me, though I know you can cheaper versions of phone add ons. I used to have a curve tracer, but never used it a great deal. Thanks for your kind wishes, bless you, all the best to yourself & yours.

Your welcome. I was a little reticent about sharing some aspects of my life, but like you I often want to know in greater depth what makes folk tick. That same curiosity drives me to find out how things work on a deeper level. Capacitive droppers are widely used in modern devices, clever trick eh? It sounds like rock n roll saved your soul, hope your fully recovered. I'm also with you there on saving bugs & beasties lives if I can: compassion & empathy are attributes too few people have. Re hifi, sounds like you've delved deep, what's your setup now? Lastly, green eyes, lucky man, bet the ladies love you : ) Thanks again for watching, regards, Andy.

@@diabolicalartificer Hi Andy Thinking back to the '80s you hit the nail on the head about the traveller scene and feeling like another world. I was only on the periphery but the little spot we occupied at Stonehenge in '88 was other worldly. Shame the helicopter and agressive coppers spoiled it. Went again in '89 and it was all over - apart from speaking to Arthur Pendragon on a nearby road we were kept away with guard dogs. As to green eyes, not really (too busy looking at their phones) but my ex, she loved them.

@@BrumAdam I remember siting on a bus on Beltane/May Day at Tickow Lane watching folk go by, the people I saw blew my mind , it was like Lord of the Rings. There were folks with dreadlocks which was uncommon in the early 80's, there were also folk who looked like gnomes, a few witches, fucking cosmic. wish I could go back, just for 5 minutes. Sorry mate but last Stonehenge was 84 so either your minds playing tricks or you may be thinking about a site elsewhere, on the way to SH. I used to have a hand drawn Stongehenge 88 poster with celtic knotwork round the sides, now sadly long gone. I got it off the artist at a festy somewhere. Every year after 84 there was an effort to reach the stones, as you say, but too many gavvers. I remember the helicoptors, must have cost 10's of 1000's. What I really miss is the availability of cheap lorrys & buses & cheap motors. Ali Om, Om Siva.

@@diabolicalartificer Yeah it was a site near stonehenge. There certainly were some interesting characters around. One guy picked up our little butane stove, inhaled deeply from it, said 'butane, what a rush' and wandered off!!!

@@BrumAdam "As to green eyes, not really (too busy looking at their phones) .." Brilliant. Unfortunately phone addiction is a really dystopian modern disease.

Me too, building valve amps sates my creative urge as well as giving the old noggin something to chew on. If I have any regrets, I wish I'd kept it up from when I was younger. Not doing so, not going to college, changed my life forever. ATB.

Nice amp. My musical tastes have broadened too, if you like singer songwriters check out Oh Susanna - Johnstown. Also recently got turned onto Lee Hazlewood. Thanks as always for watching.

You too Frank, all the best, here's mud in your in your eye.

Didn't know that , thank you & glad you liked something a little different. As they say on the road, good luck, or in Romany kushka bok, may the road rise with you TFW

No wuckers. I did have a service manual for the TSC-1000, it & the TSC-2000 went to a bloke to get fixed, he lost the manual. I got it from a place that is no longer trading, Telford electronics. These were also made under the name Datatape which may give you a lead.TFW.

Grand to see you back. Aye,the BGA is a problem child. I'll see what I can do re your suggestion. Have a good un yourself & all the best for 25.

Dummy load. Grid of OP valves if something is wrong. If you scope the grid then your not testing the output transformer which is a big part of the amplifier. Well done for experimenting, good fun innit?

Apologies, an early video. The formula is (OD - ID x H)/2 {OD = outer dia, ID = Inner dia, H = height of core} to get your core area in cm squared. You then divide 42 by area cm squared, so 42/area. Hope that helps. TFW.

@@diabolicalartificer Thanks for your reply , Though on the video , I see , (OD - ID x H)/2 {OD = , that bit . Then it says something , which is the bit I can not read , Then I see , Turns per volt = 42/core area . Was the bit I could not see , say , outer dia, ID = Inner dia, H = height of core} ? that it ? And what you replied to my first question/comment the full and right formula ?

@@jayk2k The blurb reads - (OD-IDxH)2 = core area in cm squared. Turns per volt = 42/core area. To find turns per volt divide 42 by the core area. Example - 42/20 =2.1T per volt. So for a primary of 240v = 240 x 2.1 = 504 turns. However, this doesn't take into account the actual flux density of the core, so it's a general rule of thumb. I usually add more turns, if there's room. For a toroid, wrap 10 turns round the core, measure the total length to find how much wire you need, then add some on top as the windings get progressively longer the more turns you put on the core. I got this formula from - ua-cam.com/video/Q6GkSNfAEx4/v-deo.html as well as several free PDF's available online. See also Transformer Design & Manufacturing by Robert G Wolpert amongst others. I have an archive of numerous books etc in PDF form I'd be happy to share, drop me an email if so.

@@diabolicalartificer thanks will check that video in a sec . And what is your email ? Would love to see the book and pdfs

@@jayk2k It's there, no disrespect, use your brain.

Thanks, that's very perceptive & your welcome.TFW.

Bless you, it is a gob full though & hard to type. Greetings from the swamps on the East coast ish. Isn't the internet great? Om.

I suspect there may be a few more twists & turns. TBH most valve amps aren't as complicated as the BGA, but hope I show how to de-bug. I'll fettle the bugger yet.

Good tips there. I have a little zener checker which uses the same principle you outline. TFW.

Привет, 6N14N is equivalent to EL84, what is the point please? TFW.

Лампа 6Р4П вместо 6П14П ua-cam.com/video/wZ4m76vyKJY/v-deo.htmlsi=S21cZ6aM5nj_P455

Me too, hope you picked up a few tips & wotnot, TFW.

Amorphous cores are out of my price range I'm afraid. TFW

@@diabolicalartificer They can be found on digikey, per kw they are much less expensive than a bought salvage toroid. On aliexpress they are super cheap, and they are legitimate, but probably over rated in power handling. Which you can go by physical dimesions as its impossible to fake the material. Its specific, and well, when the chinese have the machines, the stuff is cheap to make, like sheet steel. Honest, all inverters and power transformers like pole transformers should be using the amorphous toroid. Its been around for decades, it saves ten or twenty!percent when used in the same fashion. AND they are smaller and eaiser to cool, use less copper because the induction lengths to get the magnetic field paths are shorter. So it makes much more sense, scientifically they create less magnetic inducted heat, so hf and rf they are not doing anything bad. ITS just the garbling bohemith economy is slow and dead when it comes to legitimate innovation, they would do some weird switching digitized station shit, instead of just having low loss transformers with YA KNOW the thin sheet steel toroids. ANd winding the things are so easy a 3rd grader could do it.

Bless you, thanks. The EL32 is a bit under powered as an OP valve but if you have enough of them, parallel them up. That does add more complexity though and take up more room. Like anything, it's swings & roundabouts. TFW.

No I didn't, good point. TFW.

Thanks 7 glad someone got the MAGA joke. TFW.

Glad you enjoyed it. Was it a big/long job? Aye, they had a different approach in them days. I wonder how many, or if there were any, casualty's amongst the public as a result? I do resent some of the modern practices that are overprotective. That & the fervent hysteria that ensues when someone doesn't wear PPE on UA-cam. I think death & injury were just an expected part of life back then. Apologies, off on a tangent, cheers...

@@diabolicalartificer Hi Andy. It was totally original and most caps and some resistors were shot in both amp and pre. Biggest pain was that wiring was really dense and cramped and I had to restuff some electrolytics (which is a PITA as you know). It is a really nicely made thing with a choke, ecc40, ef40, kt61 x 2 and 5z4g. I suspect that there weren't substantially more accidents with audio gear as people who used it had more knowledge and common sense? Anyway I've been looking at the tuner and unfortunately the phantom bodger has been at work on it

@@BrumAdam Yep, some old radio's etc are a nightmare to work on, components crammed in everywhere & you have remove 10 to get at 1. Still, it keeps up busy, better than vandalising telephone boxes : ) TFW.

Yep, don't forget the fun : ) All the best, Andy.

Bless you, thanks. Hope your well & TFW.

What a curious comment, but TFW anyhoo.

No wuckers mucker. Knowledge is like water in the cupped hand, on a warm day. Be sure to drink it before it disappears. TFW : )

Bless you, I always wanted to be an aesthetic but haven't got the robes. Do I get to wear a funny hat? TFW : )

Thanks, that's very kind, again, glad to help. TFW.

Sorry Mr lucky, your comment disappeared for four days. It can be complicated, but to build one that works is very easy too. I rarely draw loadlines any more, I pop the graph on my PC, use a ruler to find a bias point & the value of the Rk, that's it. I then test & go from there. I've see the online calculators but i'm a bit old fashioned preferring pen & paper. they are an excellent tool though. TFW.

@@diabolicalartificer - fair enough. I've used that web-based calculator to verify load lines drawn on other YT channels but haven't found anyone that has used it so I don't know how good it is.

@@Luckiestmanalive-bb1mi I've used a few PC based calculators and design software like WinISD to calculate speaker cabs, a mains tfmr calc etc, all have been good, so it's probable the LL calc is ok. I have trouble with a lot of software as a lot use spreadsheets, no idea how to use them. Cheers...

Thank you, glad to have been of some help. Valves are fascinating devices & an excellent way to get into electronics, as, compared to transistors, they are easy to configure. Once you get a basic understanding & have a play with some circuits, it gets easier to understand. TFW & Good Luck.