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anybody out there with a maplknoll tt, et arm, or walker equip that has tried using a compressor and tank instead of a pump? the pumps that come with a mapleknoll are too noisy to have in the sme room and even in the house. aftermarket pumps are very expensive if thy are to be quiet inough to use.
whats to stop smeone from using a standard compressor to fill a tank, and then run off the tank by running a long tube to the tt? long runs are recommended for the ususal pumps to smooth out their pulses.
?.............help.........tr
THANKS to you all for responding. in case you dont know, the mapleknoll is one VIVID sounding record player.
one reveletory experience was putting on some dan hicks and his hot licks. al achmnitt engineered these for the most part and that upright bass is in hte room with you!
its an ergonomic nightmare for cueing but cartridge swapping is way easier than most because the whole arm can turn over. i paid $125 for mine because it sat on the used shelf with a $325 price for about 3 yrs. i suggested to the owner of the store that the guy owed him rent for storage. he quickly handed over the table for that song of a price.
thanx again guys!!!!1.....regards......tr
Bought a 5 gallon, fillable, air compressor tank made by Midwest Products at the local Farm & Fleet store. Its advertised as a portable air tank that you can fill and take to the beach for filling rafts or what have you. It has a capacity of 125 psi max., a top mounted air pressure gauge, a fill valve, a pressure relief valve, and a shuttlecock valve for releasing the pressure into the supplied hose with a tire pressure filler type termination. Cost was about $30.00. Cut off the end of the hose and used a brass 3/16 to 1/8 inch reducer. Connected my ET tonearms aquarium hose to the other end of the reducer sleeve. I filled the tank to 80 psi, opened the valve slightly and everything seemed to work fine with the arm. Also the quiet due to the lack of the Wisa pump running in the room was quite noticeable. The tank valve is too touchy, and I see now I will need a regulator. Opening the valve to the correct point without blowing the 1/8 inch lines off the arm fitting is a pain. 1/16 inch to little and the arm sticks, 1/16 too much and you hear a pop and then the loud hissing of air escaping from the tank. If I open the air valve on the tank to the minimum position at which the arm becomes frictionless, I read about 10 psi loss on the tank gauge per LP side, or 20 psi useage per album. If I pressurize the tank to 100 psi, I should get about 5 albums worth of playing time between repressurization. They have larger tanks, and I wish I would have bought the 10 gal. size.
As for the sound, it is a definite improvement. I listened to 1 side of Roger Daltry "One of the boys" LP using the tank, immediately afterward I shut off the tank, connected the Wisa pump, and replayed the side. The ambience of the recording environment was lacking somewhat using the pump compared to the tank. Soundstage shrank a little, and there was slightly less "presence" to the music. The improvement was easy to discern, and I don't think It is occuring because I expect it to sound better, or for some other psychoacoustic reason. Equipment is:
Oracle Delphi MKII, ET1 tonearm with Mission Reference 773 MC cartridge, Conrad Johnson PV10 preamp, Quicksilver Silver Mono tube amps, Magnepan MG 1.6 speakers.
I think eliminating the pressure surges of the pump, and lowering the noise floor in the room by using the tank and eliminating the pump noise are what contributes to this improvement. I need to listen further before making a final judgement, but preliminary results are very encourageing, and I won't be hooking the pump back up.
I've thought about the same thing for my ET tonearm. Our local Farm & Fleet store sold a compressor tank only with a pressure gauge that you can fill at your local gas station air pump, or with a portable compressor. There would then be no pump in the room, only a tank full of pressurized air that would give hours of listening time before refilling. ET's literature says that their arm requires 3 to 5 psi, but higher pressures are no problem. They even mention that you can use an air compressor/tank and shut it off after its charged, and run the arm for hours. I looked at this portable, fillable tank last year before I had any thought about buying an air bearing tonearm and new table, and wouldn't you know now that I want one, they aren't in store anymore. I am looking around to locate this tank,(about the size of a propane barbecue grill tank, and cost about $40.00), and will let you know how it works when I find it.
Send your question to a friend who has the Mapleknoll. Doghead40@netzero.net He may be able to help. If not you may need to check out Lloyd Walker for the answer.
You may have a problem with condensation (water) getting in the system.
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