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EniGmA1987
558
Aug 11, 2017
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What a wonderful tube amp for low impedance headphones, like all the headphones Massdrop has been selling lately. Cant wait to use them with the new HiFiMan planars.
My one wish is we could get a balanced version of this amp with a tube for each channel. Its great this supports a 4-pin output for balanced headphones, but when the amp itself is single ended it only serves as a nice accessibility feature than anything real.


My first upgrade when I get it will be to put a linear power supply on it and get rid of the switching wall wart :D
Aug 11, 2017
Mullet
16
Aug 11, 2017
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Look up the SOHA II - it's basically, sort of what you're looking for. It came before the CTH.
If this had two tubes, it wouldn't be the amp that it is. It uses both triodes for amplification - actually voltage gain. Current gain is via an output buffer.
Aug 11, 2017
EniGmA1987
558
Aug 11, 2017
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two tubes would still be used for the voltage gain in a balanced version. Instead of using one side of each triode for each channel like this amp does, each channel would have its own tube. With the positive side signal on one triode and the negative side signal on the other triode. Or, run both positive left and positive right on the same tube and both negatives on the other tube for less distortion but more crosstalk.
Aug 11, 2017
Mullet
16
Aug 11, 2017
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Understood. I don't think this amp was ever intended to be balanced. I've seen a few people do it in the DIY realm with two CTH boards. The 4 pin output here I don't think is balanced output in this case...
Aug 11, 2017
AllanMarcus
40
Aug 12, 2017
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What LPS will you get?
The HD6xx is low impedance?
Aug 12, 2017
Elsid
698
Aug 12, 2017
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It did say in the desciption ,that it had a lot of room. Probably going to be great for mods.
Aug 12, 2017
EniGmA1987
558
Aug 14, 2017
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I have my own LPS from an OEM that provides high regulation linear power supplies for industrial use. I have it custom wired for my audio needs.
And no, the Sen 6xx is not low impedance. That is so far the only headphone Massdrop sells with their brand name on it that is not a low impedance headphone.
Aug 14, 2017
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