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HPS 6.1
HPS 6.1
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Old 6th July 2020, 11:28 PM   #51
syn08 is offline syn08  Canada
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Originally Posted by kamis View Post
Low output MM cartridge? Is 3.5mv/5cm/sec MM suitable for HPS 6.1?
HPS 4.2 PC foil is also 1oz?
3.5mV is not a low output MM. Barring some possible exceptions, one should NOT use a bipolar amp with MMs. The noise current and the high impedance of the MMs are generating plenty of noise, to largely exceed the amplifier very low voltage noise. For MMs use 6.1, for low output MCs you can use either 6.1 or 4.2.

Yes, everything is 1oz. If something helps with dissipating heat that's the ground plane, and the copper thickness id pretty much irrelevant. Thick copper traces are useful for high currents. Does not apply here.
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Old 7th July 2020, 07:23 PM   #52
syn08 is offline syn08  Canada
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There is no "better", there are only requirements and preferences. 4.2 is extremely low voltage noise (0.28nV/rtHz), has 5-10pA/rtHz (or larger, depending on the transistors you are using) input current noise, up to 100nA DC input current (after nulling, due to the thermal drift) and is rather power hungry (runs pretty hot). 6.1 has higher noise (0.4nV/rtHz), virtually zero input current noise (can be used with low output MM cartridges or high output MC cartridges), virtually zero DC input current and can be fed from batteries. Make your choice depending on your cartridge and preferences. Myself I am currently using 6.1 with a Benzo Micro low output MC cartridge.
Above, it is 6.2 that has 0.4nV/rtHz (6.1 is about 0.33nV/rtHz), 6.2 can be fed from batteries (6.1 still needs a stiff raw power supply, as much as 4.2), and it is 6.2 I am currently using, sorry for the confusion.
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