justin

You'd have a much lower damping factor resulting in the amp having less control over the headphone, most noticeable in the bass. You may prefer this, as many OTL tube amps have practically no damping factor and the headphones are free to resonate.

Never tried one. But it's really, really hard to make an electrostatic amp and sell it for less than $1k. And that would be the cheapest design possible but still with decent parts in a nice looking case. It's the custom high voltage power supply and the low quantities that kill it.

It's not possible to beat the Stax SRM-313 for the price

oh and most importantly, you need at least 3 filament supplies (input 6H30, 2nd 6H30, 6S4As can share one)

I tried, but failed, to build this a few years ago. I didn't have as much test equipment as I do now or as much experience, but what I found was i might have around 40Vrms audio signal at the cathodes of the 2nd stage tubes. However, each 0A2 tube was losing about 10Vrms audio, so there was almost nothing left for the 6S4A to amplify. I had RCA 0A2 tubes but never tried any others. You may want to try Russian equivalents that may be newer. Also, you can try neon lamps or zener diodes, i never tried either of those to see if it solved my problem. Also, at least for testing, you can capacitor couple the output of the 2nd stage but by removing the 0A2s you'll have to change the circuit so the voltage on the 6H30 isn't exceeded and add a grid resistor for the 6S4A The only thing I see incomplete in the schematic is that power ratings aren't given for the resistors but if you can't calculate these you'll have a lot more problems later. There's also no way to adjust DC voltages, you may want to replace the 1.2K resistor with a resistor+pot in series, to adjust points A and B to be 0VDC, and replace the 600 ohm degeneration resistors with resistors + a pot for a +/- DC offset adjustment. You should also split the 300K resistors into 3x 100K or 2x 150K or at least make sure the single 300K is rated for high voltage

it's hard to predict this one since it's almost always going to come with a pair of headphones and some of the older HE90 i've seen look much more worn than the ones that came from Meier 2 years ago. If you did find the amp by itself i think you could pay anywhere from 3 to 6k for it

Hmm i've had this question multiple times lately. You can still get the WPI connector from Arrow

i got an 80/100, but this isn't NYC. several UVA restaurants/bars are 1/4 mile away

I don't know all the rules but unless your vacuum cleaner is made of metal it probably doesn't have to have the earth wire

Just use 2 resistors as a voltage divider (attenuator). A lot of amps have similar things in the signal path in addition to the volume control, before and/or after the volume control. You're not going to get more than 0.000001% distortion, just pick appropriate value resistors based on the source's output impedance, not too low and not too high

I've been reading a lot of this stuff, and I think these issues are underrated. The problem is unless you design the entire audio system yourself thinking about ground loops, and have control over the power source, there's not a lot you can do about it. The typical high-end audio system is a combination of equipment made to consumer standards, some kind of pseudo pro stuff, something untested & improperly made, and maybe throw in a computer or cable TV line somewhere

unless it is a plitron, then you have tell them

Nope...i think it's been at least 2 years since I did

it is a balanced amp so i think Quad Dual Monos is more appropriate

Since it was also a movie title, shouldn't it be " The 'Blue Hawaii' "? Or on a front panel of an amp would it be "The Blue Hawaii". Is this boomana's area of expertise?

- New power supply design in a separate box - New active current sources for the output tubes - Some changes in parts values (Linear Systems LSK389 instead of the discontinued Toshiba 2SK389), one BJT transistor changed There's a huge and constantly growing list of other improvements of the type that don't appear on the schematic

I wonder if anyone will actually build it with a 50V cap for C3?

Either KG Solidstate-Triode or Solidstate-Tube

Probably, although the silver one looks in good condition. I'd have to wait to see the condition of the black ones and date of manufacture. If they're really dealer demos then they're being cleared out since the 3rd edition (new transport again) is out

Possibly..but he did offer me another one he has in silver..and says he'll get 2 more black ones next month. Some kind of connection to get dealer demos is what he says

http://www.youtube.com/watch?v=ZvJjoSPp_8k&feature=related There's a counter on this ball... CROSSFIRE.... http://www.youtube.com/watch?v=UVMYOpBm1cM&feature=related When McDonalds had decent toys

was going to meet the guy halfway (47 miles) to pick up the Krell SACD Standard, but he called me and said he dropped it when packing it up. Ok...the search continues

Order one of these in black and let us know how it works out

the Sony can be repaired for a flat rate of $254, which I think includes return shipping, but there are many stories of getting it back without the problem being resolved or physical damage

It doesn't seem nearly as bad as SCD-1 problems. Also, the retail price for MKIII went up from 4k to 6k, and I think the MKIII are too new to find used. You'd probably pay 5k at a dealer after bargaining it down -- more than 3x what I paid for a used MKII.