kevin gilmore

8significant areas on both units have circuit board heatsink area. Still you could easily attach real heatsinks to those areas and put more holes in the case to let the heat out. And then bias up the output a bit more. This one uses a 28V power supply. So output rails are +/-14v, pretty low voltage swing. Outputs are MJD243/MJD253 and are bipolar. tube is current source plate load, capacitor coupled to a virtually identical copy of the liquid carbon output stage (current feedback/bipolar) with a different servo.

If the new LCX sounds worse than the original, its probably because of the rail splitter, otherwise the circuitry and parts are identical. I have never seen a rail splitter test well. The original squarewaves all burned up due to heat and other stupidity, but otherwise sounded really nice, still the only headphone amp I know of that is both current feedback and all of the voltage gain in the output stage. The re-done version is still a sweet but low powered amp. dynalo and supersymmetry dynalo still out perform everything else in their power class and as far as I know, no one has ever been able to burn one up.

massdrop and schiit seem to be trying to out cheap each other. clearly this thing is much better built than the original for less than half the price. whether the protection circuit will prevent it from blowing up if you insert unbalanced and balanced headphones is currently unknown. but cost cutting is evident everywhere. external switcher removes the need for line power inside the chassis (joutenheim) and the AC rated power switch. But rail splitter causes all sorts of issues. Virtually no heatsinking so the amp runs pretty much class B. etc the CTH is the same thing. More rail splitter because its single ended.

I wonder if amb knows that alex is using his protection circuit?

well at least it has a dc protection circuit which the original did not have, and its sure going to need it, absolutely no heatsinking of any kind. OH look, a rail splitter that's necessary because of the ultra cheap single output switching brick. At least its actually built better than the original at less than half the cost. i'll bet that plugging in both unbalanced and balanced headphones is going to cause it to blow up. just like the original

it is one board per channel for the tube. your choice of tube front or tube back (different layouts)

don't build the DHT one unless you plan on spending piles of cash on tubes

I really like that knob

845 in a megatron configuration is what you want

so the options for the new woo amp 1) plate resistors, they already said its not this 2) inductors, they already said its not this 3) center tapped inductor, you get about 6db of gain with this. 3a) push pull output transformer. all sorts of issues with gain and power with this 4) solid state current source maximum voltage gain of 6sn7 is about 20, maximum voltage gain of 300b is less than 4 somewhere there are likely to be input/interstage transformers and then you are still going to have trouble getting to a voltage gain of 500 or more if you want some feedback to reduce the distortion. the viva evidently is also low on gain, and uses and output transformer. why people produce shit like this I do not know

pretty sure it was posted that340.zip

That is a 30 amp nema connector.

Stax mafia boards linked to in the stax mafia boards thread i highly recommend you doing a diy-t2 as your first amplifier. More than one person has done this. If you survive you will learn a lot less dangerous is the supersymmetry dynalo with the golden reference power supply then the current feedback amp balanced or single ended with the golden reference power supply more challenging is the uber2 amp

i'm not sure that the burson like things are going to be good for servo opamps. from what I have seen all of these things are bipolar input and have significant input offset current. Plus they drift with temperature. A low offset jfet input slow opamp is what you want for a servo

on the ksa5 the servo's are in the negative feedback loop. So they can influence the sound a little bit.

the circlotron boards are 900V

same size board, up to 35mm caps, had to move the pass transistors, needs checking silicon carbide rectifiers 100mm x 109mm goldenreferencelargecap.zip

that was for the alps quad pots as I remember

The Zener voltage minus 1.4V (darlington) plus about 1 V across the control transistor specifies the minimum output voltage. The zener guarantees enough start up voltage to power up the opamp so something like 8v with a 5v reference

The opamp needs to be able to run on what the output voltage is, and the zener plus 1.4V has to be less than the desired output voltage.

Cp1117 optional part for doing controlled power up. For example tube circlotron. If you don't want it, do not populate the part.

will fix the package in a minute. moved the resistor and diode to limit turn on charging current on the caps new picture and board file someone please check for errors

here is the new single, a little longer same width circlotronhvpowersinglenewver3swt.zip

yes I think you are right.

which current limit circuit? on the singles board, to put the ac input on the front requires a size change