The Bigblog!

Hahahaha

Wow!! That looks really classy! But I am confused. Why an Avalon phonostage and not your own BB3?

/Karl

Ah, makes sense.If it’s solid state it won’t be as sensitive to hum sources as a valve stage either.

/K

I've been waiting for these

Well they say if you use all 0.1% parts, it's around +/-0.1db I think, but can't be 100% on that.


"(Accuracy) improves by a factor of √2 for every doubling of components used to make up the desired value. So by way of an example, if 2 1% 100pF capacitors are paralleled to create a 200 pF capacitor, the probable network tolerance improves to 0.707%. Place 4 in parallel, and the probable tolerance is ~0.5%, while 10 in parallel will result in about 0.35% tolerance. The network tolerance will be better than the worst case tolerance of the components used – and that is the main reason or using this technique.

This approach works for series/parallel combinations as well, as shown for the 1.5nF capacitor in Figure 3 below.

It is also important to note that the worst case tolerance of a network as described is that of the individual components – so if you use 1% resistors, your worst case tolerance will be 1%, while the nominal and likely accuracy will most likely be according to the effects of paralleling (or placing in series) as discussed above.

The IRN uses all SMD components which are mounted on a simple single sided PCB. The PCB must be mounted inside a conductive metal enclosure – mild steel is recommended since it will offer some magnetic shielding, although diecast aluminum is a suitable second choice is the former is not available.

You will need two PCB’s for a stereo test IRN. Use good quality phono connectors for the inputs and outputs to ensure a high quality connection and make sure the connectors are isolated from the housing to prevent earth loops. A separate earth bond point should be run from the housing to the earth bond of the phono amp under test.

Listed below are the required parts from Mouser. All the capacitors are NPO/COG types rated at 0.5 and 1%. If you can afford tighter tolerances, that is a step you should consider for even greater accuracy.

Standard 1% resistors have been specified and selection to tighter tolerances can also bring benefits beyond the quoted 0.025% nominal accuracy of this IRN"

Better than 0.025%..........i knew it was decent lol

This is an IRN....inverse RIAA Network.

Effectively, the more accurate this is, the more accurately you can measure the RIAA accuracy of a Phonostage.

What I intend to do with it is what's going to be interesting. That's all to come though.

Hahaha,

Ok, ill try

Oh yes....I will be able to measure any Phonostage.

Including my own, which I will do first and publish the unfiltered outcome.

I have a bit of learning to do first as there is far more capability in the Oscilloscope I bought than I am able to concentrate on at the minute.

I have two very experienced and knowledgeable guides on this subject and will be consulting them thoroughly before doing anything else.

Thought it may be interesting to have a kind of less intense Analogue version of ASR?

Measurements, technical details for the lay man (like me) and maybe a needle drop. That bit Inspired by CageyH.

I have a few more pieces of the puzzle to but together yet, like a decent soundcard for my laptop.

It'll happen, just not sure when.

Parts on the way for this now...looking forward to giving it a go

Picked up some rockwool panels from a member of HWW for FREE!!

Pretty bloody obviously that they work lol

These panels have changed the bloody game here....I'll do a thorough post on them but the difference they have made in my rudimentary placement of them is confusing my mind, Jim.

I have never....NEVER heard the backing vocalists as separate individuals on Eric Clapton Unplugged before, yet as of right now, I can pick out what sound like three separate voices. I'm going to watch the video of it later (first time ever) and see if I'm right....but it's so clear and obvious that they are separate people.....I should've listen to DSJR a while back when he suggested acoustic panels.

Maybe I'll flog the 686 and buy a Crown amp....think I've found a new Guru.

You have had plenty of hints stored in the back of your mind from Steves visit. No one on the planet uses as much acoustic panelling as he does apart from Taylor Wimpey!

Room acoustics work substantially and although your room is small I am sure controlling some of the bass and other frequencies will improve imaging and detail?

Yup, Steve's room has been on my mind for some time, and we both know that room treatment can pay dividends.

What I hadn't surmised was how bloody effective it would be in this small space.

I had it in mind that the larger rooms needed it more, because of how much space there is, but in truth, this little room of mine has been converted into what sounds like a much bigger space

Better resolution, better individual space in the soundstage, which is now sounding less attached to the speakers and an actual image.

Depth, transparency.... literally everything you can think of has been pulled up by the bootlaces.

Bass............still audibly resonating via the floor boards, but even more so now as the rest of the mush has been largely removed. It's made it clear that I need to deal with that next.

However, LF detail is unreal. I don't think I've actually heard these speakers before.

BTW, I know I've only scratched the surface, but I am now going to fully immerse myself in the ins and outs of room treatment ready for my next big HiFi investment.

Oh I know it's a huge subject.

Like everything I suppose it's all about what the ears tell you.

Mine are telling me to sort the bass out lol

Yes, just spikes into the floor, through the carpet