georgehifi
Responses from georgehifi
| Any experience driving B&W 802 diamonds w/ Rogue A Hi Dougdubin, the B&W802D's are a bit of nasty load for an amp around the 60hz to 800hz mark, especially at 60hz where the phase angle is also sever in conjunction with the resistance. These speakers are more suited to good low output impedanc... | |
| aunt corey buffer preamp This BUF03 is class A unity gain zero feedback buffer and is a real sleeper, pity it's not being made anymore, NOS is all that's availible, and it runs very hot, big heatsinking is a must.I use this buffer for the output stage of a heavily modded ... | |
| The future of preamps Swampwalker: I have to set the record straight for you, not once have I trashed the sound of dc coupled output tube preamp. In fact as active tube preamps go it would sound the most transparent way of doing it, no coupling caps in the signal path ... | |
| The future of preamps Audiolabyrinth go with your gut on this, as the Krell engineers have voiced their concerns about direct coupled tube output and recommended an input cap on the Krell.I not the one trying to sell you anything, and I agree I would not like to put a ... | |
| The future of preamps You have rights to be cautious Audiolabyrinth about protecting your expensive poweramps, I agree get it in writing. A tube pre if it's output is capacitor or transformer coupled gives some safeguard to precious large power dc coupled poweramps. Bu... | |
| Magtech Even though the 3.6 are a fairly benign 4ohm constant load, they still like a bit of current driven into them, and the Magtech is right up there for them.Quote from Stereophile's tests confirm this: "Approximates a resistive load of around 4 ohms ... | |
| When to power off a tube amp? Tomcy6:"Many recent vintage tube preamps have a slow start cycle built in. It slowly increases the voltage going to the tubes over a 20 to 45 second interval when you turn the preamp on."I think you'll find that's because they used tube recifiers,... | |
| When to power off a tube amp? Bifwynne: Tube failure or arcing (flare up) happens in nearly all cases when the amp is first turned on from cold. This is because the HT comes onto a cold tube. One way to rectify it is to get a 30sec delay circuit for the HT, so the heaters have... | |
| The future of preamps Audiolabyrinth: You don't have to match the source output volts to the amps max input volts. As you reduce the source volts with the volume control anyway. So long as you can reach the desired max level you want from your speakers, it does not mat... | |
| When to power off a tube amp? If you go out for just an hour or so leave them on. So long as you home insurance is paid up.Turning off is not so much the problem, it's the turn on that is the tube deteriorator in most amps. As nearly all of them bring on the heater supply and ... | |
| The future of preamps Audiolabyrinth: An amp that is 3.58v to get it to give full output, is very unusual. Most amps are around 1.5v-2v in to get full output. In this case it could be likely you may need an active preamp. I would still do the "Bolero Test" as it still ... | |
| The future of preamps In short do the "Bolero Test" with your source directly connected to the poweramp.And go with Arthur Salvatore's 2 closing statements: 1/ "In short, if you need an active line stage because your source is not up to the task of driving the amplifie... | |
| The future of preamps Yes Brownsfan: Arthur Salvator's "Bolero Test" (linked) is most enlightening to the need of active preamps. If you like the sound of your system without the colourations of a active preamp involved using this test, then don't use it use a passive ... | |
| McCormack , Aragon or Forte Yogboy: I believe the Forte 3 is the same as the Forte 1 which is lower rail voltage and pure Class A to 50w. And is only Fet input but BJT (bi-polar) output, Nelson kindly posted the circuit diagram here.http://www.diyaudio.com/forums/attachments... | |
| Impedance mismatch question Yes I have extremely happy Lightspeed customers that are driving it into 22k poweramps with tube riaa phono stages as the source. As for driving interconnects the only time this comes into factor is when the interconnects is poor quality and has v... |