Thanks Tony, a restore is so much more interesting than installing the skinwalker ranch boards

Full length video with total explanation and schematic explanation especially. I love the long vids, especially when you explain your thought process, I learn A LOT from that! Thanks Tony for going through the headaches of making videos for all of us, I know it can't be easy. 🙂

I'd like the highly technical schematic version. :) I wish you peace, joy, and happiness as well!

Tony, I vote for schematics, technical analysis and chat.

Hi Tony, solder and chat gets my vote….thanks for the fun 👌

Schematic talk is awesome

Schematics & chat sounds good

Tony, thank you for the 4k, 65" tv is now in full detail and glory.

Being an electronic tech myself, I like the highly technical restoration videos.

My vote: technical video.

I would love a solder and chat style video. They hold my attention more.

Keep doing what your doing Tony with detailed analysis and longer the better videos. Keep up the good work!

Tony, it's great to see someone else go and dig in deep and get one of these amps back running. I'm a 15-year AV bench tech, these amps you have bring back great memories. I like when you dig deep with the docs and measurements please keep up the great work

I really like the solder and chat. Showing what parts you chose, what modifications were made and why. Basic performance testing for 5 minutes or so at the end. Schematic talk is ok for about 5 minutes then my attention turns to late night snacks. I can move the slider forward, so no big deal. I'll watch your content regardless. Keep up the great work!

Hi, because I can watch your videos for hours on end, I'm asking for a detailed repair procedure - the longer and more detailed the better 😁 The relay is a good joke, someone use the soft start principle to disconnect the speakers 🤪 Nice day 🙂Tom

This reminds me of the amp we had in our congregation center. It was a KH Telewatt mono amp with a Uher hifi mixer connected to it. The mixer originally needed a 9V block. Someone did modify the amp to provide this 9V to the mixer. They just made a small board, put it in a plastic bag and shoved it in there. The original balanced amp input was converted to unbalanced and the now free thrid contact delivered the 9V (the mixer was unbalanced anyways). It did work flawless for 20 years.

My vote, i like to see long movies from from master Tony so i can relax and grab some popcorn.

Sche-Ma-Tics! Sche-Ma-Tics!

So agree, there are too many "I've watched a short KZfaq video experts" Long detailed, unedited, vids are always the best learning medium.

I'm just being greedy, solder and chat, go through schematics, inspection/ testing then review of what was good/ bad about build and finally what recommendations for improvement should someone attempt a similar project, I'm sure this is at least a 20 part unedited series. (Vid should start with a warning that the video is not for 45 second, I've watched a short and now I'm an want-a-be expert in the subject) As I said I'm being totally selfish and greedy, but it's a good way for us mortals to learn about the thought processes involved and why/ how you arrive at any specific decision. Really enjoy all your vids and am completely appreciative of the time you take to make real educational content for those who want to learn, also enjoy the humor e.g. "Audiophile".

Great video your my go to guy for learning electronics . You seem to really enjoy teaching people about the safe and correct way to trouble shoot vintage gear . Thank you for working so hard . You really are smarter than you give yourself credit for

Schematic analysis with "sodda & chat" (as they say in NY).

Solder and chat is very entertaining. In depth schematic and background is very helpfull for understanding. So the last one is my favorite. I like brainstimulation. 😁Thanks for your work!

Definitely schematics and chat for me, please. I learn so much when the schematics are being followed but I'm obviously good with whatever the mob decides as either way I'm going to learn something.

I'm in for a solder and chat; 120V conversion as well. Thank you for your time Tony, enjoy your weekend!

The scorch mark on the foam made my day and I think you mean enclosure (not insulated case). One channel is obviously meant for an electrostatic speaker, ho, ho. From a schematic description perspective, a suggestion is to have a smallish cut-out section placed next to what you are referring to on the PCB (rather than jumping between monolith and labyrinth).

i vote technical but i am going to watch and enjoy anything you make and i won't complain.😁

Please do Solder and chat discussing your most critical decision criteria (and testing). Also - love your benediction at the end of every video.

Tony should do a Crown "Grounded Bridge" amplifier. One of Gerald Stanley's finest inventions back in the day . Micro-Tech, Macro-Tech, Macro/Studio Reference....

all of the above is good for me I do not have any problem with long.

thank you tony. please 'bore us' with technical detail and schematics :)

I want to too say thank you for sharing your hobby with us ! People need to rember that ! Let me just say it is your channel and you should have the ability to conduct it as you see fit ! I for one like watching it just the way you have been doing it ! There's some other channels that I watch with shorter videos and wish that they shared more ! I watch some other channels who's content is deep as,well witch takes time to show and explain ! I JUST WANTED TO SAY THANK YOU AGAIN AND SAY DO WHAT YOU HAVE BEEN DOING !!!!

The Hafler 220 I had, did not have any speaker protection either. Glad it never popped the Acoustat speakers it was connected to at the time.

I’m absolutely loving your sarcasm Tony! Please keep it up, after all now you have 240v it doubles the soundstage to at least 10 foot wide, unlike those awful 120v things with their 5”11 foot soundstage.

Technical

Both schematics and saulder and chat. Take your time split it up if you need to. You always have fun and we all enjoy your work and efforts. Thanks 👍

I'd be interested in seeing you rewire it for 120V, explaining as you go. Anything else is good too.

Solder and chat sounds good to me, actually all the above sounds good too.

48V Siemens relay, those contacts are actually rated at 3A only, but are pretty reliable, have had some running well past the 100 million cycle mark with no issues.

Thanks Tony.

Your hilarious play with the audioFile totaly reminds me of Darth Helmet playing with action figures in SpaceBalls. lol.

I'm pretty sure that "Audio File" is a mill bastard file, which might explain what was done to that poor amp. I feel for it especially because I used to own a 700 Series Two with the Cylon meters, just like that one - but without the bastardization. Please save that poor amp! Edit: I have installed several of the White Oak Audio boards in PL400's and 700's, and they are wonderful. Easy to install (relatively), easy to adjust, and they measure and sound good. Combine that with the speaker relay from Watts Abundant, and you have a serious upgrade. In the last 700 I rebuilt, I added a soft-start circuit based on the one in the Pioneer SX-1980, but with a really heavy contactor, not some ice-cube relay. FYI, my apprentice and I watched your video together, and he prompted me to hit the "like" button!

Tony, the length is immaterial, it's the content that counts. I love your relaxed, informed and entertaining style and enjoy a combination of theory and practice. I would just request you not use the computer cursor alone as an indicator when trying to follow a diagram; a chopstick or similar as a pointer is good, or a highlighted cursor surround. Quite a few folks seem to forget that thier own view is different to one we get at this end and a black cursor against a mono-chrome diagram can be a right, royal pain in the proverbial. Having said all that, I can't really complain about your own technique. I do find this stuff very entertaing though I suspect you have probably forgotten more than I will ever pick up at my time of life. Please keep up the good work for as long as it works for you, too!! 🧐🥺

Really highly technical, excruciatingly long solder n chat video with extensive post-op testing added for good measure, please. Thank you!

I just found your channel whilst looking for replacement obsolete geranium transotors, in fact GET535 or 635 fron a very early computer board. As an engineer, I would like you to do a technical and chat whilst wiring, if you can do it at the same time. Your video is good,and I will be following your videos and looking at previous ones. I watch most video's to the end so don't worry about a long one. Thanks from the UK.

6:28 just replace the pink wire with an 8-awg and its good to go. Tony do it your way, I like schematic approach.

Be very technical. Love your longer videos

Hola Tony, has el video como siempre lo haces, vas trabajando y conversando de lo que haces y explicas los diagramas, saludos.

Phoenix Audio Forum is the home base for all things Phase Linear. PS I'd love the full tech version. Watts Abundant makes a good speaker relay just for these.

I'm good with however you do the video. My favorite aspects of your videos are: 1) Diagnosing the problem(s), including your methodology to find the issue. (these are my most favorite). 2) Calibration(s), if any, with the resulting measurements (THD, response...etc.). 3) Circuit theory, particularly on unique designs. 4) Any mods that you've deemed appropriate (e.g. speaker protect). On this one, I suspect that the recent videos on the Model 400 will have a bit of overlap on the circuit theory so you can probably just refer to those videos if you don't want to repeat yourself. I'm sure it is better for those that may be watching these years later or have a PL 700 that homes in on these videos to have the whole spiel that was covered in the PL 400 but there does come a point where I could appreciate not wanting to say the same things over and over again. I eagerly await your next video. I feel my sound stage shrinking.

Well this is intresting. Have fun finding all the jank 😂

If you can go through a technical analysis on why the flame linear failed that would be interesting. Always wondered if the amp would oscillate with a reactive load or were there too few output devices for that power level.

I can understand that, if the voltage is doubled, the current is halved but why would we do that? If I'm in Germany, we'd use 220 but since we're in the USA, 120VAC makes the most sense! I'd say change the circuitry from "mysterious" to the style of circuit you designed with the 400, showing and explaining as you go, as you do so well! All parts should be, as I think you would say, appropriate for operation at the 700-watt power level. I think that, when you're done and demonstrating the amp, it should look, maybe, like the big brother of the 400; like it is! How does that sound?

Hello Tony... I'd suggest to post the schematic in the discription as a link. Make a compact video about the work done and the results.

Tony you have to make the video's how you want to make them !!!!!! if one complaints well though luck... and as said already in the comments it been more fun if it was wired for 120 volts and a schuko plug and plugged it in to 220 / 240 volts.....

You seem like a really nice person and I hate to see you go through all of the massive stress this build will cause you. Put a chain on it and use it as a boat anchor. Just kidding.

Hi, Restore that thing. And chat about audiophile phoolery...and talk also about the circuitry... My two cents: I would leave the main filter cap(s) alone, because these are industrial grade and also able of supply a huge amount of current. In your last PL video you replaced them with standart solder pin type caps... They are far infeiror compared the these high current screw terminal caps. There is a reason why, these go for around 5 times the price of the same spect standart pin solder type capacitors... 😉 Anyway, I do like your attitude and chats... Also, I watched this video in my living room on a large TV in 2160p and it's crystal clear. I even be able to read the entire face plate labeling : Model 700 Series Two Audio Standard Amplifier Whatever audio standard means... Did they design an audio studio or an audio superior model as well? 😉😊 Cheers,

It would have been more fun if it was wired for 120V had a schuko and you were in Europe! Thank you for not molesting it with new PCBs.

22:19 I think the technical explanation would be best, as it explains different circuit topologies and how they work; I don't think this is boring, as long as there's not _too_ much exposition.

I would like to see you make the input power requirements switchable between 240 and 120v.

"Flame linear" seems to be correct here, 95 volts across speaker terminals is not good. The "board-in-the-bag" was probably an attempt to protect speakers. Relay is a Siemens V23154 C0721-xxx (not clearly visible, maybe 24V?) Much used "Kammrelais" used in Europe. Also it seems more Eu components there.. As it was wired for 240V, maybe it came from across the pond. Will be interesting to see and hear when done!

a lot of GIs boat those amps in Germany us army px. They would bring them back to us and they didn't work

Bore me Tony. I love technical videos.

I had the same problem with French. Not my strong suit.

I know someone who builds this way ( if you will call this a build ).......the man is a kind of fantast and has a long carreer ( NO it is not BOB Dalton ) ..have a look at his latest tube amplifier ( the 275 ) .......75 watt and 15 watt Edcore OPT....etc......some parts are glued ( quite "shocking" haha ).....and sold with a lifetime warranty.......

KZfaq also has 1.75 x playback speed!

Solder and chat but covert to 120V, not 220V!

There were no schematic issues last video. Some people just complain anyway

I'd have stopped and said "nope" at the plastic bag. 😮

Please do Another .... Powerful Solder N- Chat ! 700 Watts worth.

Oh I don't want to say it, but I think this amp comes from Germany.😅 I live in Germany and I know the parts very well. These ceramic resistors are somes from Vitrohm, the yellow Capacitor are from Frako alias Roederstein and the Relay is from Siemens; Diodes can be from ITT (Intermetall). But these work with the bag and the thin wires. 🙈 I think it was made in the 80s.

How about a crown "tech " amp..... D series, power tech, micro tech, com tech, macro tech, and the studio reference , a macro tech for recording studios. All the tech amps were are "grounded bridge" output topology... the amp topology was so robust crown made versions to power industrial actuators I am curious to hear your take and explanation of the design.. Oh , and gut that pig on your bench....

Solder & chat.

More guitar solos.

the sound stage is locked inside that bag :(

Technical please Tony!

I think the AMP should stay split-phase US 240 Volts! My 240 volt Mig Welder works better on thick steel than the 120 volt one.

Judging by the charr on the foam, it's a time delayed incendiary device. But seriously, it looks like someone's attempt at a speaker, dethump delay.

a shame i would love to see it being water / liquid cooled 😛😛😛

Hi Tony, do you have bare MC2300 driver boards available? Thanks

RIP Tony - 11 days no videos. 😢

Tony, listen, idiotic videos are always too long, and intelligent videos are always too short. Your videos are always too short. I’m positive if you made a three hour long video repairing an amplifier everyone would watch it.

Never saw a power amp with a colostomy bag