When listening to 2SK135/Exicon, the bass is punchy and vivid, the high is warm and charming, soft.
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The hm3s sounds great, have bought several boards however, as they are a high strung design in my opinion. It appears that one set of pre-drivers was left out of this design, and I think it may affect the long term durability. I haven’t spent any time doing any repairs or forensic examination to the dead boards however, am too busy, so I just order more since they are cheap.
This design is very sensitive to inputs, as there is no capacitor isolation. I had a garbage cable that had a 3.5mm mini jack going into a preamp, and it smoked both boards upon startup. After changing to proper rca connections, all is good.
Second set of boards had one create a loud buzz, along with some offset if I recall after a year of use.
Third set of boards ordered after another board developed the same buzz, probably an oscillation.
Am coming to the point of considering a better version now, but have added tiny ferrites to the gate leads on the outputs, as are on the original.
The other clones that are the basis of this thread probably sound great, and have less issues I would hope, since they are a more faithful copy of the original version.
This design is very sensitive to inputs, as there is no capacitor isolation. I had a garbage cable that had a 3.5mm mini jack going into a preamp, and it smoked both boards upon startup. After changing to proper rca connections, all is good.
Second set of boards had one create a loud buzz, along with some offset if I recall after a year of use.
Third set of boards ordered after another board developed the same buzz, probably an oscillation.
Am coming to the point of considering a better version now, but have added tiny ferrites to the gate leads on the outputs, as are on the original.
The other clones that are the basis of this thread probably sound great, and have less issues I would hope, since they are a more faithful copy of the original version.
Hi Erikovsky, do you a pair of GM8 deluxe available?Hi Luke,
Thanks for the question. I run them by ~60VDC per rail, 1~2 pair. About output, yes, around 100W, I am using bookshelf speaker so no need for higher power.
The GM8-Deluxe with interchangeable module makes everything interesting. I am going to build a module with 2SK170 pair, without damaging the mother board!
Is anyone interested in Group-Buy of GM8-Deluxe?
I can make some very good quality Gold-Plated, 2Oz-Copper, 2mm-thick PCBs.
regards,
Marjohn
pcb gm 27
See you this: JFET input high speed stereo preamplifier PCB Mimesis 27 + 4 pieces 2N5566 | eBay
regars
See you this: JFET input high speed stereo preamplifier PCB Mimesis 27 + 4 pieces 2N5566 | eBay
regars
gm 27
On the schematic of the GM 27 I don't see the values of the supply voltages but I believe they are these Vcc + 40-0-40V. So you need a transformer of 50VA with two secondaries of about VCA 35-0-35. It's correct?
On the schematic of the GM 27 I don't see the values of the supply voltages but I believe they are these Vcc + 40-0-40V. So you need a transformer of 50VA with two secondaries of about VCA 35-0-35. It's correct?