@ 12:00 If by losing your thermal paste brush with the blue handle, you meant that you were hiding it under the handle of your pyrex measuring cup, then yes, you lost it. 😄 I am glad you revived the talking versions, for those that don't want to hear voice, they can always mute and turn on closed caption. I also thank you for sharing some substitute lists, I've been trying to compile them on a spreadsheet for my own personal info hoard.👍
@ 2:00 Thank you for sharing your research & evaluation time for the list of transistor substitutions you use. The originals seem to be in use in a lot of US made amps during that time period, and its good to have a verified compilation of what may work, and still be available as replacements in the climate of quickly obsolescenced parts due to the lack of modern day need in producing consumer devices with full sized components from the 70's..
I really enjoy the solder and chat and the long-format, chatty nature of your videos. One of the best electronics channels on RU-vid. Keep up the great work.
Hi I remember been a apprentice intruder alarm engineer in the mid 80s in the North East of England UK been on call out having a pager that bleeps and trying to find a phone box that worked to ring the office for my next call in the middle of the night l thanks for the invention of the mobile phone a life saver😊
Got some hardy laughs out of this one Tony, good to hear you again. As a technologist, I love hearing you talk about the old X-ray equipment. Crazy how all that old tech just disappeared.
I really like master stages clean 2020 and a heated sonic cleaner for cleaning parts and hardware like this. Works well for cleaning boards and flux at least for the several boards I've tried so far though I'd be cautious doing that.
For large thermal mass PCBs you can use a PCB preheater to elevate the subassembly temperature before vacuum extracting. I find it beneficial if you add a small amount of fresh solder to the pad before extraction.
I made a tool for holding the output transistors from a wood dowel with a hollow end (snug fit to can), to facilitate keeping fingers clean while installing the transistor.
I'm really enjoying this series and especially pleased to have another "solder and chat" 😊 May I ask you a question about your work? Presumably at times you need to troubleshoot a machine while is energised and producing x-rays? How do you protect yourself - I am familiar with x-ray operatives working behind a lead screen or even exiting the room, but it must be more difficult if you need to observe what is going on.
I used to have the bias transistor drift out after a meltdown of an nsm jukebox amo i fixed so many of. It would keep increasing bias and blow up in a few hours. Amps can drive you crazy.
Hi Tony, Another great video! regarding the transistors: for Bias transistor Q401 - MJE180 can be used - see service manual page 22, and it is still available, even here is Europe! - funny that the schematic says sje1602 and the component table says MJE180 for the power transistors - do you think ME15003/4 work ? I just happened to have them on hand (several dozen for my Marantz 500 I hope to repair one day and where the xtors have to be matched on N and P side [not P with N]). You made a comment on the small heat sinks - those transistors do become quite warm - maybe that is only in mine, I replaced all the 2n5415 & 2n3440, because even though they tested OK with DMM and Chinese Gizmo testers - on the tek576- some where quite leaky - I concluded that it was because they run quite warm all the time. by the way just in case -on page 15 - you have the procedure to test the boards without the powerstack by using jumpers.
I don’t know how the young guys do it. Not only are expected to be on call with immediate response expected, but they want you to attend ‘meetings’ over the phone. I’m like you, I like peace and quiet in order to concentrate on my work; I have plenty of conversations going on in my head already. 🙂 Edit: However, I didn’t care for the videos in which YOU were silent. I much prefer the chatty format. 🙂
You try setting up a compo' board for a take, while reaching around a camera, and wondering what else will go wrong - Press REC maybe you might be a bit shaky. Sorry but Mr Tonyb gets this comment every few months.
So, a good en! Back in the middle 70's we carried Tec 435 I think. Never took the chance of checkin, it was my chief tool. Worked on large power supplies/inverters , firing boards, hockey pucks and caps that looked like "gerry" cans were usually the electro failure point. I can relate to your communication problems, but would add all the lack of tech we have today made us better technicians because we had to figure it out. BTW, recently in for pics of knees and the imagery was done with slick looking Toshibas(?), nice looking equipment.Always enjoy, thanks. Got one of the Pace tools from TE, thanks for the reminder.
