justin

An issue with using a SRPP output stage with an electrostatic amp is that SRPP amps are designed to drive a static impedance, which is why you usually see them as INPUT stages on amplifiers where the next stage will always have the same load, such as the next tube's grid resistor. An electrostatic headphone is a capacitive load, so you have to do some tricks to properly do SRPP with it (see here: The Tube CAD Journal,SRPP Optimal Rak Value 2) What this means, if you do not do this properly, is you could have a frequency response that varies greatly depending on the capacitance of the headphone, maybe a bell curve shape. Even setting the "Rak value" for a certain capacitance may not be enough if the capacitance varies widely between the different makes of e-stat headphones. When I looked into this concept I thought of adding a switch to set it for different capacitance headphones, but why bother, just use a resistive plate load on the tube or if you want more gain wire the top tube as a current source

Not true billy...although balanced all the way may be the most pure, there are many ways to convert an unbalanced signal to balanced. Most amps just use a differential amplifier to do it

not hard, but to make a good one, you're just putting 2 amps and 2 power supplies in 1 big box. and it would be expensive and would never be taken seriously as a reference quality amp for either electrostats or dynamics

An electrostatic amp with 12AX7 front-end (5751) and 5687 outputs has been shown on Tubecad before. KG, i would assume its paralleled sections of 5687 like the Stax 007t before assuming it's SRPP. I looked into using SRPP for the output stage of an electrostatic amp, but you have to do some tricks to set it up for a capacitive load and at that point it doesn't make sense to use it...lots of info on that on tubecad as well

on the Maestro were the headphone out and pre-outs the same thing?

GIVE ME SOME SHIT TO DRINK

edit: but we dont know if the wall-warts were the original PSU

All of the wall-warts in the SS1 had fuses soldered to their boards, but they were too large to blow

would i have to include the 500 Amp charging adapter?

ok i got it, i just looked away from the screen so i could only see it in peripheral vision, and then it had switched to the other direction

ok whats the catch, its only spinning clockwise

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sorry for the off-topic, but to give an idea of the size required to make a decent stax portable, figure about 5W which allows +/-300V and 1mA for each output stage (compared to BH which is +/-400V and 20mA output bias). That would be a life of 27 minutes if you used a 9V nimh battery

have you read krmathis's demands on this? It must also be the same size as the Pico, which can't even fit a Stax jack on the front panel, creating difficulties.

Current Score: 76 Best Possible Score: 124 out of 192 can still get 1 of 2 in final, and the winner

HE60 to Stax jack adapter

no need, i just found some

Looking for 4x unmarked white tube boxes that fit EL34s. They measure about 1.3x4.4".

FAIL unless you've already received a prototype from SumR and tested it with the PSU and Dynafet amp

Maybe he was being nagged and turned away

n/m, i think the brown caps are for outputs

Resistor Types--Does It Matter?

I also had Wake making a run. I had too many #1s and #2s going all the way, and a #4 sounded good. just picked the wrong one.. Also forgot to take the longer 3 point distance into account. It could cut down on the number of upsets

You should get a resistor rated for at least 3-5x the amount of power used. Physically larger resistors can also be lower noise

I'm not doing fantastic so far, but good news is we're almost done with Round 1 and I can still get up to 15 of the Sweet 16 teams