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Everything posted by Jessica_k

  1. I have not had much time this week so had only a quick look at it at the lab today, Strangely, connected to my EL34 power amp both MM and MC were as quiet as a mouse, the analyser showed a small amount of 50Hz but that was on both. I am bringing it back morrow, but if you can be without it again after the BO I will put it in the main home system that is very sensitive and see if I can see any issues
  2. Bringing the PS1+PSU1 again, Puritan stuff, and a new, straight off the press, only finished today PRE1 classic. Two Line input 6NS7 buffer. There may be a bit of hum…. None in the office systems, but present in the home system so (shrug) Sorry not bringing the TT I am limiting the amount of transporting so it will be in top state for Kegworth. Really looking forward to morrow Jessica xxx
  3. Lucky there was not a disaster with the TT as I lifted it to pack away I found the back foot was only hanging on by the weight of the TT. In getting it level during setup I had unscrewed it all the way. That may have accounted for it being a bit vibration sensitive. Thanks John for another great BO and so lovey to finally see some everyone who was there. Jessica xxxx
  4. Who is this guy Jack Hammer, he is very noisy!!!!
  5. Currently listing at average levels in the high 70’s The loudest noise I had ever heard was in my youth I was taken to a drag racing strip in the US. Was just walking past a top fuel dragster when it powered up, fingers pressed as deep in my ears as possible and still pain. ( >140db?) I ran as quick as possible away and lucky it did not do permanent damage. Elf and safty not considered then jessica xx
  6. What you done with the muses? i will concur, they sound sublime Jessica.
  7. I would really like to reiterate my comment on cartridges. The question was £150 MM to £550 MC. The £150 MM is mid price, the £550 MC is low end so even if MC is better than MM (another debate) the budget does not allow the MC to show its pace. Spending £500 MM and you are looking at a top end cartridge, to get such a MC and it’s (again debate) superiority you would pay £4K (ish) there are bargains in both category so I am generalising To start getting improvements going to MC from a mid MM expect to pay £800 plus i use a ART9xa (£1300) and a Linn K18 (MM about £200 in the 90’s) the art wins but the linn gives a good fight Jessica xx
  8. My view is the price breaks you are mentioning are probably the ones that give the biggest bang for buck assuming you are careful with selection with perhaps one exception the moving coil, a high quality MM cart with a great tip profile in the £3-400 mark would outperform the £550 MC and gives more options with the phono stage Jessica xx
  9. I have 5) The unknown of previous commitments for that week going ahead. Many of us have other places to be, work, holidays etc a lot of which have been moved from the previous year that still may not go ahead this year. I have a holiday that was to be last year that if going ahead will mean I will have to pull out and the holiday will depend on the COVID rules and status of 5 European countries, so not holding my breath even for September/November, who knows!!! Jessica xx
  10. Interesting they only claim -75db signal to noise and is a solid state design using off the shelf current and voltage feedback op amps with relays to select inputs and outputs Jessica xx
  11. Relays may not be the answer either, fine if the selection keeps the relay unpowered, but if powered then the relay gets tired being continuously on and over time the contact weakens. This can be overcome by using latching or SR relays. These keep there position without power, ideal for processor controlled interfaces, note to self add a STM processor, touch screen, and remote, with SR latches to next generation of PS1. Now that would be sexy Jessica xx
  12. Wot he said lol, I have been converted to Puritan for a few years now and I am expected to bring the conditioner and cables to every BO as it gets the best out of anything that it powers. I have recently got a classic+, about £100, and that is even better than the classic, I now use the + to power my PS1 phono stages ( a free one with every purchase) Jessica xx
  13. In the end it comes down to cost benefit. I guess if we are going to gripe, mine is resting on the name. When a company/designer makes it big then sells everything with a name premium regardless of how it sounds and how much it cost to make Jessica
  14. I have no issues in doing this as long as it is done in the correct order. First build the best you can regardless of cost, this is your maximum cost point adding profit etc. Then for the many that could not afford that, look at what the minimum cost point could be and still maintain a darn good commercial product but with reduced options (say MM only, single enclosure, no load switching, down a level or two in components specifically capacitors (PS1 10x over the PS2). These become the start and end points and adding back some of the options gives a graduation or upgrade path. Jessica
  15. Alan has described it, but to say for a triode, FET or any other transistor there limited ways the 3 pins can be wired, using these and combining either hybrid, stacking valves/FET's, and/or using innovative current paths makes the difference between mundane and superb designs. The use of opamps in designs, mostly used in cheap phonos, pre's with phonos and integrated amps limits the designer and the quality is dictated primarily by the IC (I do note that there are some products that use unique designs that get more from the IC than expected) Jessica
  16. The best audio electronics is synergy of design, layout, and quality of parts. Using the old adage you cannot make a purse out of a sows ear. Dressing up a poor design with expensive parts, having a good design and poorly implement its layout, and having a great design, good layout but poor part selection will not get you a good product. Good commercial products can do the first two well but price point usually limits the last with component costs along with all the manufacture to punter costs eating into the build. This is where home modifications can improve the product. And if everything is crammed into a single package (intergrated amp) then quality mods are not really an option. The dedicated phono stage give the space to improve on the original design or build if desired. Also note the tendency now to go to SMD designs, this makes modifications much more difficult unless you have the right tools and skills Jessica
  17. Thanks, I will look at Silk, I like their products and if they have "off the shelf" as you say that I could use then I could look at designing a phono using them.
  18. I agree 100% with using LC or even LR for the filter, I would love to design one, but getting the inductors built to the required quality is difficult and very expensive. Jessica
  19. Hi everyone, Starting with the first point, that separate phono stages are a big advancement in the reproduction of vinyl recording, is like saying that pre-amps were a big advancement when broken away from integrated amps. Very few if any would say that an integrated amp is better than separate pre and power. The requirements of a phono stage are unique, extreme gain, very low noise, a bonkers frequency response and demanding input loading. Getting these features away from the pre-amp or integrated allows high quality components and specific (ie not a standard opamp with a feedback filter) designs to be made with dedicated supplies. Using some high quality caps alone requires huge real-estate that could not be fitted in a pre box. Going further, power supplies can be separately boxed to further increase the separation of signal and sources of noise. So I would say separate phono stages are a leap forward. I have developed over many years now the Alpha2delta range of phono stages with the following criteria, that it should be all valve*, that 12AX7 or any high mu valves will not be used, the circuit to be very low distortion with high PSRR and the best components used. After a number of false starts the PS1 was born, a two box phono, MM and MC with adjustable loads and gain. I could have gone for the hybrid approach and there are some gains to be had doing this (I have a hybrid design up my sleeve) but there are some down sides too, many of the best FETs are no longer available and manufactures can drop them at a whim. Valves are here to stay with both Russia, China and some Eastern Europe countries eager to keep manufacturing and a huge stock of US JAN NOS still available, and choosing the right valve and design overcomes many of the issues the standard valve designs have. The PS1 however has started to become very expensive to manufacture and will never be a compromise, hence the PS2 was made. This is a compromised PS1, same design but in a single box, parts chosen to a quality/price with the money spent where it is the most important, using Mundorf EVO oil signal caps, polystyrene RIAA caps and same valve set (less matched) and at a very low price considering what goes in. The power supply is the same as used in the PS1 but without the polypropylene caps. The whole difference between the PS1 and PS2 is what you get with better components. The PS1 was reviewed in the HiFi pig by Ian McIntosh that gave it a thumbs up (go to hifi pig to read) *The power supply is not valve Jessica
  20. Details added to spreadsheet, Jack (NSM) will be with me this year, however, I may not be able to attend if my holiday goes ahead and that will mean I will have to scratch the room Jessica xx
  21. This is precisely why I said use balanced input at the highest gain circuit where the signal to noise ratio is at its lowest ie MC phono inputs. This will help to reduce the noise entering the other parts of the gain chain where signal to noise is higher. Any noise at the front end is multiplied by large amount <> 65db (1770x)where from there on <>32db (30x). As for the original question it totally depends on the amplifier design and switching, the balanced out of say a pre may also switch in the balanced input to isolate the ground from the cold side or it could be just a diff driver amp circuit attached to the output and active all the time Jessica xx
  22. Fully balanced or if you cannot do that, balanced where it is needed most. If you are running a MC cart, the smallest signals are those coming from it and the most affected by external noise, running the cart to the phono balance helps to reduce the noise and less is amplified by the rest of the system. Doing anything after the signal is at line level has less effect. Running fully balanced is of course the best Jessica
  23. I would love to come, but if allowed, I should be cruising the Med. if foreign travel is still off then I will be there, no need for a bedroom Jessica xx
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