Very nice work!! More than just cosmetic, real refurbishing!

A very nice quality rebuild. I had mine done about 8 or 9 years ago. I've had the Quad IIs since 1972 and they're in use daily with my ESL57s.

Nice one Pete! That took quite a bit of work, Percy Verance and dedication to do that mate! 10 out 10 for that mate! My Bro-in-law purchased that exact same setup you have there with same pre-amp etc back in 1998. The only difference was he had some Mordaunt-Short speakers at the time. He was very lucky though... The Quad II's were in Mint condition at the time and needed no work doing to them... The Quad pre-amp etc, he purchased from new and were still in Mint condition... The system sounded like magic. I will never forget that... Keep going mate. Look forward to the next update...

Absolutely fabulous. this puts the whole recycling / environmental issue into perspective when properly manufactured seventy year old gear can be renovated back to practically (or in terms of the component and connector upgrades better than) new condition and still return a state of the art performance. Contrast this with modern mass-manufactured and "disposable"equipment with associated rapidly obsolescent (and by definition irreplaceable) microchips and sealed casings. An absolute joy to watch and no doubt these will be handed down to the next generation for another seventy years of thrilling performance

Being a Quad user for decades I love your videos. One of my 405's needs work so will be digging into it soon.

Absolutely first class work on the Valve Quads.

this is meticulous craft and so watchable, love it, love it....,

That was an absolute joy to watch, great to see old HiFi brought back for a new life. Beautiful work too, thanks for sharing from another old git!

Very thorough and impressive work! I've just finished replacing some components of some recently acquired QII+22s, and this video tour was a real treat for me!

Lovely Job, you should be very proud of the work you've done👍

Unique insight into a splendid piece of work, thank you for sharing!

What an amazing video. Please make more videos, your methodical way is great and be interested to learn more from you

Excellent, glad that you're back.

Beautiful restoration. Well done!

Great work - thanks so much for sharing with us.

Better than when new, top quality work, wish my dad was still alive to have watched this , he had the full quad valve set up in the 60s inc the tuners, fm with the added multiplex decoder for stereo and a med short short am tuner. Those 15 wqtts each amp seemed plenty powerful enough at the time with 12 inch Goodmans speakers.

A great refurbishment Peter full Marks Mate and Greeting from Australia Regards Ian,

A really enjojayable video, great workmanship!

Superb, I wish I had your patience and dedication. Glad you are a Genesis fan!

Hi old git, I have only just come across this, your videos are always welcome, interesting and entertaining. Consider doing more Cheers

Excellent job. Very informative. Thanks.

Thanks for this lesson, just what I needed to get going with my pair of Quads! Glad to see that GZ34, that I have, is ok so I don’t have to search for GZ32 which don’t seem too easy to find. The path is clear 😊

Very useful video... thanks. I was gifted a pair of these (along with the accompanying preamp & tuner) by a member of a ski forum last year, it was his first proper system and even though I'd never met the chap outside of chatting about hifi online he wanted to pass them on to someone who would use them. A wondrous act of generosity. The itch to delve into a refurbishment and modernisation is getting strong now, so it's good to find a video like this. I'm looking forward to seeing if they hold their own in the modern world of hifi. J James.

This was excellent. I have a pair of monoblocks and the matching stereo pre amp which I've yet to rebuild alonf with the original owner's manual which has the schematic. As yours, mine needs a complete rebuild and new paint but the badges are in good shape but i have the 220 v model so I'll just use a step up transformer. Thankyou! Bryan from Canada

Excellent work!… 😎

A beautiful piece of clear, informative instruction on a quality piece of kit. It Wouk be great to see you take on a similar challenge with a Quad 303 Power Amplifier. Many thanks.

Fascinating, I would trust you with my Audio note.

Quality work they look great 😀 oh and welcome back to the youtube.

great rebuilt!

Congratulations for the great good job!

Fantastic restoration

Great job!!!

Great video 👍

Fantastic to watch this!! Makes me want to get out my Quad II's for a listen. I love the sound they deliver (your playing Genesis and Vaughan Williams...those are my choice selections, made me smile) but they have been shelved for now, usurped by a Radford STA25. I have the ESL 57's...and they deliver musical bliss. And on standby, ready to play in a moments notice, my trusty Quad 303. Thank you for this video!

Very nice. I have a pair of Quad II which is needs to be rebuild and/or restoration.

Wow….nice work…like new again👍 wish i could work with that…👍save a lot of money

Brilliant MrD

Very nicely done the rebuild and upgrades congrates. Can you show in the circuit diagram the three modification that you have done. Thanks.

Nice job.

Quad IIs sounds really nice my brother in law have a pair. But he is using big horns , so don't need many watts there 😛

Really interesting. Thanks.

Very nice job! Not sure about the mains switches though.

I’d be interested to see more of your work on the 34 preamp; might a video be in the works??

Fantastic work. Great set of Skills! Could i just use a fridge starting or motor starting style capacitor as the smoothing cap?

Pleeeaaase do the comparison! :) We have two Quad 2's, two 303's and two of the Leak amps all need restoring :)

Love your work, just starting on my rebuild, do you have a schematic for the mods?

Super video - very informative and interesting for that. Didn't you have a video of a Quad 303 repair? Can't find it anywhere.

Loved this video so much I've watched it a few times, already! Lovely job! I'm curious, what made you decide to rewire rather than reuse the old loom?

Very informative and useful. One question and perhaps I now the answer ( slight changes to the circuit) why did you not use the original wiring loom?

Very good rebuild! Thoroughly enjoyed you video. Which speakers do you have in your lounge system?

Fantastic work. I need a Quad Point one pre amp renovated. To go with my Leak 20 and quad ESL57 speakers. Also do you sell renovated Quad equipment?

Hi Pete! I will get my hands on a pair of Quad II soon but they are not coming with the Quad Control Pre-Amplifier. My idea was to adapt the amplifier to be able to connect my Marantz 1060 pre amplifier outputs to the Quad II Amplifier Inputs. Should I installed that 470uF capacitor on the Quad II inputs? Thanks for sharing your experience, I really enjoying watching your videos, it is inspiring!

Great video Pete. I have several Quad systems and my Quad II's are currently off with Rob at Audiolabs at the moment as rebuilding them is beyond my capabilities. I have a couple of questions, both of which you seem to have solved in this rebuild - I also have the 'broken perspex badges', who did you get to build new ones as I can't find anyone I trust to do that, the second is colour - did you ever manage to pin down a RAL number for these units? I realise that the colours were less than completely consistent over the many years of production and mine will have faded over 65 years but I'd like to get as close as possible.... I'm looking forward to trying my Quad II's with my 34 but would suggest not writing off their use with an original 22 unit. Rob rebuilt my original 22 for me and did some power and RCA socket mods,. He sent me scope images of the remarkably low measured THD and the flat response that a 22 can manage when it's working properly. When coupled to my original ESL 57's and choosing 'music to suit' it sounds as good as anything I've ever heard....

Hi Peter, like you I once purchased the Douk 300B SE PCB with parts, never got around to building it. You had an awesome video up showing the build and issues you encountered. Can it still be seen somewhere and is it at all worth building? Kind regards, Rob.

Nice! How did you set the potentiometer in Quad 34 to set output level between 0,5 and 1,5volts? Im interested in doing the same mod but what I see you need to change 4 resistors to go up. Grateful for any help.

Thanks Pete - so so useful and the finish you achieve is fantastic. I have just got my hands on (I believe) an original pair of quad ii's - both in need of basic rebuild/ upgrade. I did see a 500mA fuse inside the ones you did which is missing from the pair I have. Is this protection for the PT in case of O/P valve failure? I have a few other questions - would you mind if I sent them your way.

I wounder if you could use 4.7uf 630v polyester caps the down side would be having to use 4 of them to to make up 16 uf but the esr would be nearly zero.

Did you change the output impedance? I’m thinking of modding mine with a switch so I can go from the stock 15 ohm to 7 ohm easily. I’m currently planning to use them with an 8 ohm speaker but hope to get ESL 57’s in the future. From what I’ve been able to find it’s a matter of snipping the jumper from R to S and adding jumpers from Q to R and S to T. Is that what you did?

I've known about these valve amps being modified and matching period AM tuners converted to FM. How much modification is acceptable till say one of those amps is no longer considered a Quad 2.? Where does one draw the line? Personally, if those capacitors are good, I wouldn't change them for modern ones. Just leave them as is.

Dear OG..... What do the restored Quads sound like?? .... All new may sound different

I was empress of the work you put in it. So nice, very nice. Is your shop in USA please? or UK? Do you accept from other country for rebuild and upgrade please? Thanks you so much.

Great bit of work very nice to watch. I would still love you to work on my 33 to put a remote on it. Strange one don’t know if you would have any idea but when I increase the treble on it only works on one side. If I change the amp boards over follows the issue I can’t see anything wrong spent ages with multimeters but know it’s on those boards 🤣🤣

At 16:08 you mount a 50+50uF capacitor on a GZ32, aren't you afraid of fatiguing it prematurely ? 19:20 For the 33pF capacitor before C2 and C3, the insulation defect of the original capacitor, added before, but also after C2 and C3 a slight capacitance to ground, is this necessary ? 18:30 Why didn't you mount the power supply socket as close as possible to the input terminals of the power supply transformer, that would be a plus, wouldn't it ? Thanks for this restoration video, well done for the work, and saving a copy of this magical little amp ! 😉

hi..for the restoration I would not replace all the original components, what a high level gift, but I would limit myself to only the faulty ones. For example, the original carya and oil capacitors are of the highest quality and it is difficult to find them at a loss. Then they also determine the sound quality of the quads, the conservative rest is undoubtedly the least to not alter the musical qualities of these exceptional amplifiers .

Hello good sir, I too am restoring my Quad 2's right now and I require a Quad badge or restoration can you tell me where you had your badges done for replacement? ..thank you kindly, also I need a volume dial for my Quad 22 pre amp and was hoping you knew of a Co.

Been waiting for a video i thought these blocks had kt66 in them

Hi, why aren’t your Quad 33 & 303 vids no longer online?

How can i contact you. I got some stuff that i need serviced. Kind regards Lukasz

HI, do you know the value in henry of the L1 choke?

These aren't for sale, by any chance?

Hi Pete - do you do repairs to a Quad Tuner - how do I contact you ?

Hi Pete, do you take on outside work?

ESL57s next..?

Soviet capacitors K42У-2 are very bad in the interstage of the amplifier !! The best Soviet capacitors in the interstage are K40У-9, K73-16, K78-2 ...

DONT put a pcb board in there .,If it has lasted 65 years i t will probably last 10 times more

Hello Pete - lovely and very lucid and informative video - thanks ! Could I inquire with you IF you could repair-refurbish (to make electrically safe, stable and reliable - for daily, present-day use) a pair of circa 1953~1955 Quad IIs that I have ? If so, could I request your email contact or even a phone number, please ? Many thanks and all best wishes - Ronnie Marker (Mumbai, INDIA)