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About andyr

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  1. True, Peter - but you don't seem to have comprehended what I said - viz: you use them to see, for instance: where the roll-off points (the '@ frequencies') need to be, to get the smoothest response when you have different slopes for HP & LP. how different component values in a passive XO change the filter response. How do you do this with a mic and REW? The way I see it ... you do the sim first - because you can do this on a computer rather than having to buy many different parts and solder them in - then you measure your choice of sim with REW. Andy
  2. andyr

    Vintage MC find -

    You seem to be in luck, Gijo! Lookee here: http://theartofsound.net/forum/showthread.php?51155-Supex-SD-900-Super-Moving-Coil-Cartridge Post #5 suggests the Supex 900 likes a load of between 2 & 20 ohms - so much lower than the default 100 ohms which your phono stage has. So by using 'T' connectors and load resistors will work for you! 👍 The equation to give you what you will end up with, if you use a load res in parallel with the 100 ohms is as follows: 1/R = 1/100 + 1/Rload So you need a 25 ohm res in parallel with the default 100 ohms to give you a result of 20 ohms. A standard res value is 22 ohms - so that should be fine. Also, as the link said "between 2 & 20 ohms" - you should make up some load plugs with 15 ohm and 10 ohms and see which you prefer. Good luck, Andy
  3. andyr

    Vintage MC find -

    A head amp is used instead of a SUT (better - in my biased opinion! 😀 ) to amplify a LOMC so as to be able to use it with an MM phono stage. So all it does is amplify the signal - typically by 10-15 times. However, as it is designed to be used with an MC ... the designers may well have selected a default load such as 100 ohms. (There shouldn't be any capacitative load - as MCs don't care about capacitance.) If so, it will only be useful with certain MCs. You should be able to test this with a multimeter. Take the lid off and put one terminal of the meter on the central pin of an input RCA and the other on the earth tag. Andy
  4. andyr

    Inline ads in a thread?

    Yeah, it's very disappointing. 🤢 Andy
  5. andyr

    Vintage MC find -

    It may well be a superb-sounding "funny little MC head amp"!! 😀 Andy
  6. Mukesh, the 'accumulator' is a battery - possibly an SLA ... although maybe not, if it only offers 6 hours of charge (I couldn't find this level of detail). My own SLA-powered 'Muse' phono stage offers about 24hrs use, before charging is needed. I can well believe the 'green' mode sounds cleaner - coming straight off the battery, with no mains involved. 🙂 Andy
  7. Eerrrhhh, no! The specs I read said that it is a battery-powered phono stage which is permanently connected to the mains for charging. Which is an interesting way of doing things. 🙂 Andy
  8. andyr

    Another one dead,ho hum.

    +1, Luc! 👍 (It would appear 'principled' and 'pollie' in the same sentence is an oxymoron these days! 😀 ) Andy
  9. I think perhaps the OP merely looked at output - eg. 5mV vs 0.3mV - and didn't realise these are MM carts vs. MC carts. Then again, I've seen several MMs/MIs that cost heaps more than some LOMCs! And
  10. Comments above. Thanks, Peter - I had missed that. I presume you mean, Peter, that he prefers listening to the 48dB L-R? That's great but almost no-one on the Planar Asylum uses steep slopes like that. Not that that matters! What matters is that Ozzie likes the sound he gets from 48dB L-R - so who cares what everyone else thinks! He has inspired me to play around with different slopes on my Frankenpans. 👍 You don't use XO simulation programs to compare different L-R slopes against each other - you use them to see, for instance: where the roll-off points (the '@ frequencies') need to be, to get the smoothest response when you have different slopes for HP & LP. how different component values in a passive XO change the filter response. Andy
  11. andyr

    Catman's Analog Musings

    Hi Felix, As you like exploring the sound of different opamps, I'm happy to send you up some AD826ANs to try. I bought them about 15 years ago as I had read someone's comparisons of lots of opamps - and these came out on top. (I used them in my Rod Elliott XOs but no longer build things with opamps - so have no need of them any more.) How many would you need for your P06? Andy
  12. Back RCAs to the front panel attenuator - 'Goldilocks' length, Bob! 😁 Too short and it won't make contact - so you'll get no signal. Too long and you will degrade the signal more than necessary. So use the length that just connects the two. But twist signal & return tightly, to minimise inductance. Andy
  13. andyr

    (another) Subwoofer hum query

    So is this interconnect shielded - whereas your previous cable wasn't? Andy
  14. andyr

    (another) Subwoofer hum query

    But, Barry, all my components - except possibly the DAB+ tuner (as I didn't make this) - have "standard 3 wire earthed mains connections" ... and I don't have any hum! I suspect this is because all my RCA sockets are isolated from their cases. IOW, cases are earthed to mains-earth ... but signal earth is never connected to mains earth. Andy
  15. So you decided to get a re-tip ... rather than, as haygeebaby did, trade in & replace? Andy