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I know what you mean. Good gear can reveal the limitations of recordings.

I know what you mean. Good gear can show the limitations of recordings.

We are also looking forward to the shoot out. No doubt the AU340 will come out on top, but by what margin, who knows?

Hello! Yes , should be fun. My dad is going to install my metal bodied Denon DL-103 into my Rega RB250 with Michell heavy Technoweight. That way, we can compare SUT.

My dad has been following this case very closely and is subscribed to Mend it Mark. Tom Evans wanted to charge £6000 to replace a single faulty Tantalum capacitor......let that sink in!

@@mydadsaysaudio6192 And Evans also challenged Mend it Mark with a note saying 'Bet you can't fix it'. There are about a dozen re-uploads of the video by various RUclipsrs. At this rate, by New Years, 90% of YT videos will be re-uploads of the video 😂

Hello. You need 2 op amps for the Fosi V3 stereo amplifier.

Sounds like a lot of fun! My dad's a bachelor so he can shake all the windows he wants. I'm reduced to a small room in my house with my wife.

No worries. Have you tried it yet?

Not yet, I hope to get started in January - there are some prior projects from my bosses (wife) side to be completed 😉. I´ll keep you informed

@PeteA362 cheers mate. It's a worthwhile and inexpensive upgrade.

Very nice. Both applications ought to work well due to the dipole nature of electrostatics and open baffles. My dad will be using them in his Visaton no box speaker, crossed over high as super tweeters.

My dad is a big fan of the LT317AT too.

Hello Alan. The panels were non branded. You should be able to find them on eBay with a search. They are very affordable, I think they were about 20 dollars for 12. Thanks for your comment.😁

Hi Robert. I'll be replacing the springs on the sub chassis in the near future and will be sure to post a video showing the interior. Thanks for your comment.😁

Thanks for your positive message. We are glad you enjoyed the video. Part 2 covering the DAC will be posted in about a week.

Hey Richard. I suppose I could find a copyright free MP3 file and record it through my phone, then you could play it back with your laptop or phone, but it wouldn't do it justice. Needless to say, it will be my last amplifier.

@@mydadsaysaudio6192 Would still be nice to hear it though, those speakers look cool.

@richardcrook2112 Thanks mate. Yeah, I love the amplifier /speaker combo. Sounds great in my little room. Makes me realise that the amplifier not only has to make the cone move, but also brake or stop. The Shuguang is masterful at this.

Let us know what you think of it when it arrives.😀

May I ask, which speakers are you planning on using with the 845 amplifier?

⁠​⁠@@mydadsaysaudio6192 I will be using Focal Aria 936, these are quite sensitive speakers. Then I will try Dali Ikon 2 also which has sensitivity 86 db.

@@mydadsaysaudio6192 I will 👍🏻

Hello! Just spoke with my dad. He suggests you check the transistors for dead shorts before replacing the fuses in this unit. Hope this helps. Cheers.

Hello! While I'm a big fan of the all metal, swing arm CD mechanisms from the first Philips players, and I've lived with about 5 models, I'm not sure how compatible they would be with later dacs. The CDM0 with its cost no object Magnesium body and Zeiss optics laser was only ever used with the first 14 bit TDA1540 Dacs in the first generation players. The Marantz CD12 incorporates a slightly scaled back, but still impressive and all metal, CDM1 Transport was one of the first 16 bit players with high end mechanisms, prior to cost cutting. My own personal modded Marantz CD273 player uses the CDM4. So, in answer to your proposition, maybe? If you had the know how and the mechanisms were compatible? Also, I've never heard of Angela, we will be sure to check them out!

@@mydadsaysaudio6192 Angela Gilbert Yeung is a great amplifier builder. Their amps are all hand built by Angela Gilbert and will often carry 1 to 2 farads capacitance onboard and can have external capacitor banks added to up that. Their previous company was Blue Circle.

@ thanks for your reply. yeah that’s why it seemed an attractive idea but as I’m happy with the player it was one of those maybe someday if it stops working things :-D

@@mddawson1 that's a massive amount of storage!

Hey, thanks for your query. In answer to your question, my dad says his unit does not have those diodes.

@@mydadsaysaudio6192 I thought that someone may have added them as a solution to the mis-tracking issue. It didn't work.

Thanks, Nick. I'm a big fan of this amplifier. As you say , it sounds good with high sensitivity speakers. Hopefully, it has a long life. I've already started scoping for techs who work on such gear. Funnily enough, I was driving home from work and stopped behind a Ute with images of tube amps and text stating that the driver was a techo. I didn't want to pull my phone out to take a picture while driving, and he drove off before I could commit his number to memory. With the help of Google, I located him. With any luck I won't be needing his services. I've already found my next dream amplifier, an Audio Research D79. The quest never ends!

Hello Jose. The Heils are still in their boxes. The tweeter upgrade for the Visaton No Box speakers is on hold for the moment, while my dad pursues other projects.

Hello! Certainly. Please refer to our full length video on this amplifier configuration for more information. Thanks.

Hi Axel. We lubricated the main bearing but just gave the tonearm rail a basic clean. It's tracked perfectly for the last year. Perhaps try cleaning the rail and see how it goes?

@@mydadsaysaudio6192 Thanks - that might be the problem I'm fasing. I will try this. R. Axel

My dad and I would both love to get our hands on a Rock Reference. As it stands, we are more than happy with our MK2 Rocks. Do you still own a turntable?

@mydadsaysaudio6192 Sadly no. I had to sell the Reference in '94 to finance the purchase of a Mac computer. I'm a graphic designer and photographer. My amp were from a small UK company called Deltec. When they went bust, I could no longer get them repaired. At that point, I decided that I'd spent enough on hi-fi! I still keep an eye on things, but I'd no idea that Max had launched a Rock 7. The reviews have been great too! Now we have hyper turntables like the Wilson Benesch GMT-1 for a hundred times the price. In fairness, the reviews I've read, state that it's pretty incredible. But it's the law of diminishing returns.

Congratulations on your find. It's a very nice player. I will get back to you with the information on biasing the op amps when I next see my dad. Thanks.

thanks, looking forward to it

I love mine too!

Hello. First, thank you for a well thought out comment. We appreciate your input. To your first point, there is no inductance in the cable. My father and I have used this configuration many times. As to your suggestion of using a Mox filter, my dad is fully aware of them and uses one in his Visaton Open Baffles, so, it's not out of the question. However, we are going to try the direct coupled route to start and see how it goes. Cheers.

@@mydadsaysaudio6192 you're wrong! of course if you twist a pair of cables you're going to get high inductance, even a single Strand cable contains inductance and there's no point as I explained take care

Thanks! I just got them home safely. 🏡

That's awesome. I'm pleased to hear your amplifiers have stood the test of time. Gives me some confidence in their longevity. And yes, I agree they are a great amplifier!

Out of curiosity, how hot do your amps run? My transformers get quite hot to the touch.

Hello. The amp came in a large cardboard box strapped inside with a foam cutout. I purchased it from eBay. I own 4 tube amps from Audio Note etc and the 845 sound's the best. I think it will be my final amplifier.😁

@@mydadsaysaudio6192Thanks for your reply. Enjoy your 845. Cheers..

Thanks!

Honestly, I'm not sure . Might work but not be optimal. The 845 tube was introduced in 1931 by RCA. Back then, loudspeakers had to be efficient and an easy load to match the lower power amplifiers of the day. Your Infinity towers are a more modern design and released when high power transistor amplifiers were plentiful.

Interesting .Thanks for the info. I'm happily running a set of Linlais.

No problem enjoy

Very true. I'm always a little nervous switching it on!

Thanks! I love it.

Hello! Yes, this is a tube amplifier that uses 845 tubes in the output. The 845 is a huge tube and glows very bright. The 845 was originally used for radio transmitting and is very powerful.

@@mydadsaysaudio6192 Pretty sure they should not glow white. If that is the case irl, then you should check the filament current against the oem tube manufacturer (and not the amp manufacturers) specifications and set accordingly. This will vary depending on what type of filament and coating are present. Probably should be anything from dull red to yellow, depending on the emissivity of the filament. But I think white is too hot.

@@mydadsaysaudio6192 I’m guessing they’re tungsten since they are still alive, but too hot a filament will not only cause sputtering but damage the plate from excessive dissipation. I’d double check the aftermarket tube mfrs. specs. If that’s what they call for then it’s probably ok. Edit: Important to note that the filament temperature is fundamentally a function of emissivity and not tube power. It needs to be right or the tube will have a short life.

@mysock351C The extreme white glow is mainly due to the camera catching the light. The tubes do glow very bright though. They have a healthy orange glow in person .

​@mysock351C Check out the previous video on the 845 amps. It shows how much light the output tubed emit.

I'm also a big fan of the 845 tube. I've kept every tube amp that's gotten into my collection. Yu Lu EL34, Leak Stereo 20, Audio Note Soro. They all sound good. Yes, 1200 volts is scary. You hear an audible noise on switch on!

Absolutely. I've run my Coral speakers on 8 watts single ended EL34 tube amps, and you really hear a difference when upping the wattage.

I'm loving it!

You are absolutely correct!

You might be interested to know I'm currently using this preamp in my system ( on loan from my dad) with a Marantz 7 tube phono stage clone. Sounds fantastic.

Like all Pass designs, it sounds excellent. Very musical, detailed, transparent. Good bass. I'd happily live with it in my system.

Thanks for your input!

Seriously!

@@mydadsaysaudio6192 the seriously worst video presentation I have seen for a long time

I must admit my dad has heard this, but I haven't. Looks like a nice class AB amp.

@@mydadsaysaudio6192 people didn't know what great value for money it was. It must have been 10% the price of a Bryston or Levinson amp, with similar performance.

Yes, the Audio Note Soro outputs 18 watts Class A power.

I purchased a pair of Linlai 845 tubes to sort of focus and manifest this amplifier when I started saving for it. This was fortunate because when the amplifier arrived one of the 845 output tubed was damaged, so I used the Linlais. The seller sent me a new tube to replace the Shuguang 845. So in answer to your query. It's supplied with Shuguang brand, but I've yet to hear them. So far I'm very pleased with the Linlai tubes.

Interesting. I was saying to my dad that with the exception of the 6SN7 tubes I won't be able to afford exotic tubes for the Shuguang 845 amplifier. Special or NOS 845 and 300B tubes cost a fortune! Luckily the amp still sounds great with its stock tubes. Mains transformers run a little higher than ambient temperature, so I'm optimistic about the amps longevity. Thanks for the input.

@@mydadsaysaudio6192 The R8 uses KT88 or EL34 tubes (you flick a switch on the back for the tube type), both of which are relatively cheap. I got a matched quad of 'The Tube Amp Doctor' KT88 tubes for $596. I also spent around $150 on 2 6SL7 (Phillips) and 3 6SN7 (AWA/RCA) NOS tubes for the amps frontend.

​@@mddawson1150 for a nice pair of input tubes is reasonable. I'm just a bit frugal in as much as I won't spend 1k or more for a pair of special outputs or drivers when I can get a Chinese matched pair of 845 tubes for 200 Australian dollars.

@@mydadsaysaudio6192 I can recommend the NOS AWA/RCA 6SN7 tubes. They don't look anything special but they a really detailed. My R8 has quite harsh top end with the stock tubes (newish Sovtek) and also made weird crackling sounds through the speakers when warming up. The replacements got rid of weird noises, smoothed out the top end while adding more detail and they are pretty cheap because so many were made.

@@mddawson1 Thanks for the recommendation. I'll keep an eye out.