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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Who knows why, but I can get away with running tiny, unshielded 6N POCC Cu arm wires straight into my step-up transformer. OTOH, I absolutely have to use shielded cable for the run between my step-up tranny and the K&K. For well-shielded phono ...
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[quote user="N-set"]Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to ge...
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Since my “End of Life" Phonostage have materialized I got exposed to a temptation of finding a “right” cable between my tonearm to the phonostage. The most critical cable between the step-up transformer and phonostage does not exist in my system anym...
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[quote user="rowuk"]How many sources do you currently have? If you are building a phono corrector, make it for 4 volts output. If you have a PC for digital playback, there are good DACs with more than 2V output. That would leave a tuner to pimp - cer...
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Hi Romy,
I did the review on the AcousticPlan amp, called the "Santor". It is indeed a two-stage amp using 4 6922 tubes in parallel to drive a high Bias Mosfet output stage (it is class A to approximately 15 watts and runs very hot). It ...
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[quote user="Romy the Cat"]
How difficult is it to find 437As good enough for a phonostage? For commercial applications is it a dead tube. WE might produce it again when they stated to redo the tubes but the existence of the Russian 6C45P pretty mu...
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[quote user="Ronnie"]Not expensive, Small size...cheap and cheerful....[/quote]…which actually brings another question: “why there is not a lot 'better' SS phonostages out there?” I am far from possessing expertise to assess this subject objectively ...
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Jarek,I would start at the beginning. Turn off and unplug the TT motor, remove the phono cable from the phonostage and use shorting plugs to short the inputs. This takes the TT/cart/arm/cable is out of the equation. Do you still have the humm? If...
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Adrian, I'm not yet convinced the PP is to blame. Also PP Richard is helping a lot to understand the issue (thank you Richard!). Now this f@#$%@%$ 100Hz noise stepped on my male ego - want ot understand where it comes from.
I qu...
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The grounding I have employed is a mixture of a "local star" and GND plane (I've obviously copied it from the Cat).I did pay a lot of attention not to have loops. Here is my grounding scheme. I wonder if there are any obvious errors?There is a switch...
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I'm precisely fighting with dialing-in the RIAA....I tried to follow (parts of) Romy's description earlier in the thread, but the anti-RIAA method and test LP give me a huge difference, much bigger than 0.2dB (rather 10dB or so):what was +/- flat usi...
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I finally got a PP unit. It is 1500W model as this is enough for now. It is the actual Golden version (Plus not available anymore) but the PP factory claims it's identical electrically just in a new aluminium case and some extras added. I managed...
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Not expensiveSmall sizeIrrelevant look and appearance ;)Don't know about the other specs. It would be easy to pull it out of the box and change to a bigger one with more inputs.I had to change the tubes, which were a bit microphonic, and the damn uns...
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I'm wondering if anyone used the industrial standard 2RM-type of connectors for a DIY Lo MC phono connection?http://www.trimmer.ru/?target=61&nom=20251The smallest is 2RM14 with 4 pins, 1mm dia so pretty low mass--no big diameter jump along the p...
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The Sussurro has an unusually wide loading range listed by Soundsmith, ranging from 470 ohms to 5k ohms. It is possible that more recent models have a somewhat tighter range between 470 and 2k ohms but I am not positive. The capacitance of Soundsmith...
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Of course I don't know if this also applies to your other cartridges that are working correctly through the same phono stage, but the VTA/bad electricity "problem" is peculiar to long line contact styluses. And as I also noted recently, po...
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True enough, Romy, and who knows, there might be a day or a late night when it sounds no different or even better with the wall power. Meantime, there is just no down side to using the battery for the iDAT-44+, despite my bad experience with th...
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Hi!
Stefano just made me aware about this forum, so I registered. Interesting thread about LCR RIAAs, one of my favorite topics :-)
About the gain of the WE437 phono: Since Stefano wants to use external MC step ups, I designed the phon...
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I lost all hope for horn loaded Lowther speakers . Got Phile Mikey (fremmer) recommended TT and new old MC cartrige (benz Mc3) so analong front sounds comparable to old modded MCintosh CD player I have. I finished (took al ong time ) Hagerman c...
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How ironic that I finally got my phono running through the ML2s, and just as you say, it was not all it should be. In fact, I would have to say at this point that I am getting better sound from my crappy CD player, which I u...
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Hi N,I just use my turntable, arm and cartridge to measure the effects of vibrations. Don't turn the platter on, drop the cartridge into a groove and your phono corrector output will tell you everything that you need to know - as it would happen duri...
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Thanks for the comments Romy. Would appreciate pointing out where the schematic is for the 7788 phono preamp or even better your friend´s 7788 mic preamp schematic. I can use the phono stage circuit minus the RIAA as a starter and th...
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Well, Romy, it took me a while but I finally got the cobwebs cleared out of the phono stage, and the Shostakovich 10th was totally engaging as music (via the TAP). The recording is the (late 60s) Melodiya (stereo) with Yevgeny Svetlanov/USSR Syp...
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Thank you for the input guys. Paul, I hate those audiopedofile(tm) talks about connectors, but unfortunately I must go through it: there is possibly one non-kosher element in my planned Ag path: Au-on-Cu Vampire, connectors soldered to silver cables...
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I have a PDF file of the manual if it interests you to read it, I can email it to you.
The unit weighs 80lbs, uses 6 6sn7's.
What I found a little odd was the spec for the phono is it says : MM Phono Stage Gain: 64 dB at 1 kHz
I own a Expre...
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[quote
user="steverino"] Later after the PP battery was replaced hum disappeared
forever.
[/quote]
Interesting. What made you
to replace the battery? The reasons I ask is a because an old buttery would not
be different for powers supply then ...
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I'm trying to remember if you have copper water pipes, and wondering again how these measure for ground resistance. You MIGHT be able to ground your phono stage case to a water pipe as a "bleeder". You could start by "jumping" it, then do something m...
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SOS, please note that your PP 2000 does not isolate one component from another within the reconstituted 60 Hz circuit. It only isolates those components from the noisy and variable wall voltage. Since you think you must isolate your TT and phono stag...
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In this cable thread there are some ideas about materials and construction of cables. My most recent attempt for good-sounding shielded phono cables are from Bud Purvine, using his specialty Litz wire construction, Vampire 800C connectors, and unblea...
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N-set, this might be a case where you can start with the 6E5P without working it so hard and still have enough gain , and correct as you go, because of the diminished frequency range requirements, and because of the third stage. Am I talking heresy ...
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