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In Reply to: RE: Denon DL-160 & loading ... posted by andyr on February 20, 2021 at 16:43:14
Hi Andy. Thanks for the reply. I have already made the change to 47k ohms, and I am currently using the Bugle with an Audio Technica AT28E LOMC cartridge with a Bryston TF-1 SUT.
That will let me use the few MM cartridges I have mounted up for that turntable. The DL-160 is an outlier, so I will probably get rid of it. All things being equal, I like the AT better anyway.
Follow Ups:
I can't find the output figure for an AT28E but I notice the VE cart database gives two important characteristics:
1. recommended load is 47K.
2. coil impedance is 17ohms.
I wouldn't necessarily agree it will sound its best at 47K - but I would suspect 1700 ohms (100x coil impedance) would be very good.
Trouble is, your Bryston TF-1 SUT is either 16dB or 22dB gain - ie. 1:6 or 1:13 coil ratio. These 'reflect' the 47.5K loading which you set your Bugle to, to become a load for the cart of:
* 1:6 ... 1,319 ohms
* 1:13 ... 281 ohms.
If you are using the 16dB gain setting ... your AT28E may well be sounding near its optimal.
But if you are using the 22dB gain option ... I suggest the loading is too low. In which case, to see how the AT28E can really sound - you need to try out a head amp in place of the SUT. (Hagerman's "Piccolo" and G Slee's "Elevator" are two commonly available options.)
Andy
There is a bit of confusion about the AT28E because there are actually two of them. One is moving magnet and the other is a low-output moving coil. I had a hard time finding the correct information too.
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