Відео

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.

I shall try & do that for you. TFW.

@@diabolicalartificer What would be the resulting final schematic with all voltages and resistors shown is generally the goal I would think. So a beginner (like me) can relate the derived schematic to the completed graph markup one does. To eliminate all confusion, for example seeing that the 300 volts on the graph would be the voltage going into the anode resistor, not at the anode itself (one example of how this number always confused me as to where it winds up in the circuit). I never realized finding the cathode resistor needed to be computed using the grid voltage curve, on and on. Wow this is finally beginning to make sense. So many books seem to make assumptions about what the reader knows. I want to learn this basic process, to the point of annotating the graph while simultaneously annotating a schematic, I think that would finally lock it in for me!

For the purposes of drawing a loadline for a Class A common cathode gain stage, no. However for a SE Class A stage, yes. That's because of the load being a output transformer which means the load is inductive & can exceed HT/B+, please see Merlins Valve Wizard site for more info. Would I be correct in assuming your main language isn't English? Forgive my inability to speak your native language, I think we could understand each other better. Could you perhaps, make a short video with a valve graph, schematic or drawing? If you go to my channel page, click "more", you can then get in touch & send me the video. I will help if I can.

@@diabolicalartificer That's Great Thanks, I will get something together

No wuckers me old duck, hope it helps.

Thanks for your IP. Used to watch Mr C but no longer. I can sort the problem but like to share my FU's as well as my successes. TFW.

Could be right, though there is no lead free solder used on this amp. It's all 60/40 or 3% silver solder on the Tek wafers. TFW.

​@@diabolicalartificerIronically you just stated the likely cause of the problem

It's mainly this amp, but yes, my amps have odd faults. Thanks for your kind words, there's more weirdness to come with this amp. TFW.

Not keen on the amp myself really but like pitting my wits against a device. Snow mostly gone here, fecking cold though, got the scope & test gear in the living room near the fire. Global warming has an upside if your nesh, glad we don't get winters like we used too. TFW, take care, keep warm.

Sounds like a Zen Koan, thou hath uttered great truth brother : ) TFW.

​@@diabolicalartificer, all oscillators are amplifiers and all amplifiers are oscillator-wannabe's!

@@goodun2974 Yep, another truism. They're endlessly fascinating and frustrating at the same time, bit like some women I've known. TFW.

Thanks for your IP. Not come across the term Kenotron before, though I know some of the lads over on DIYaudio use TV damper diodes for a similar application, they're harder to get here in the UK though. Also familiar with using the bias to activate a slow start circuit. To be honest though a soft/slow start circuit is a bit of a faff, something else to go wrong. Different ways of skinning a cat. The reason I used it in this amp & others is to give the caps an easier life whilst the valves start to conduct fully. TFW & hope you find these video's useful or whatever.

Thank you. Yep, I did, 3% Ag. I have four Tek 500 series scopes, worked on them for years & have a few precious rolls of Tek solder but also have another four different types of Ag solder too. I have spare ceramic wafers if you need any. TFW.

Excellent, your the first one to spot that. I slip little bits into my video's, obscure music lyrics etc. TFW.

Looks nice, now I have to get it to sound nice. TFW

No idea what caused the issue, I tested them when I bought them. Anyhoo, the valve is KO'd, I'm sure it has heater cathode short too. The thin bases are a pain, nowhere near as good as a proper base, care needed when swopping valves. TFW as always.

Thanks Steve for your IP. Funnily enough that's what I was going to do, I got the idea from Curious Mark in his recent video on repairing a HP clock, see ep 2. I've learned a lot from attempting to fix this amp, I've been getting guidance on UKVRR, contributions from folk like yourself too is very helpfull too, TFW.

@@diabolicalartificer It's easy to measure the phase difference at high frequencies because you can measure the time difference along the x-axis of a scope. This is difficult if the control system has a long time constant, but there's another way to measure the phase difference, which I learned from some really smart colleagues at ICL in the 1970s when testing a switched mode PSU with a 2-second time constant. You adjust the scope so the two signals are the same amplitude on the screen, then put the scope into x-y mode and look at the shape of the Lissajous figure. A diagonal line from bottom left to top right means the signals are in phase, while a circle means they are 90 degrees out of phase. My colleagues had an article on the technique published in Wireless World.

@@stevegreen5358 Thanks again Steve for those useful tips. Measuring phase difference is something I keep meaning to dive into, especially in my valve amps as the phase difference effects stability. That's a good tip there using the XY function of my scope. I have another scope which can measure phase, but it's a bit clunky & difficult to drive. TFW, cheers, Andy.

Thanks. It'd make a terrible build project, it uses lateral fets which are rare as rocking horse shit or very expensive & risky to buy. No, no soft start, no protection apart from a crowbar basic as it comes & turning into a nightmare.

It has one working channel, the other channel though is a nightmare to fix. Thanks for watching.

Yep, bang on. The Tek scope on the other hand is a work of art, I have one for sale if your after one & are in the UK. TFW.

Thanks for your IP & TFW.

Noise as you say is a many headed beast, there on one setup, gone on the next & a nightmare to trace. The "thanks for filming" comment is much appreciated. The Beanfield, aye, 40 years ago, nuts. No one was sacked or held accountable for that & more laws have been introduced since then that restrict or punish "alternative" lifestyles & protest, so, in answer to your question no lesson's learned just more of the same old same old. Only a few owd buggers like you & me remember & care. Oh well, ce la vie. TFW.

Ta. Aye , your right, testing any component can be challenging. If your stripping a bit of gear right down, you may as well change components whilst your at it. TFW.

True, but there will always be folks who think pigs with makeup, & maybe a touch of Channel #5 are quite dishy : ) In the end, the chap I did this for was happy & uses it more for tone shaping than crystal clear audio. TFW.

Thanks me duck.

Glad some of the sound survived the processing. Thanks.

Exactly, gain effects IP Z & OP Z as well as other parameters. Re crowbars I've have had issue's with them false triggering in the past but have hopefull got it right here. TFW.