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#1
Posted to rec.audio.tubes
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Input transformer when needed ?
Hi
In MIC preamps and PHONO preamps sometimes an input transformer is added that bridges the mic/phono to the first stage preamp. But many times it is done wothout any transformer , so what is the rule ? When input transformer is needed and when not ? Thanks ec |
#2
Posted to rec.audio.tubes
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Input transformer when needed ?
wavesoft wrote:
Hi In MIC preamps and PHONO preamps sometimes an input transformer is added that bridges the mic/phono to the first stage preamp. But many times it is done wothout any transformer , so what is the rule ? When input transformer is needed and when not ? Thanks ec Like most things in engineering it is a compromise. Both have their pros and cons. Talking solely about tubes then I would say: Transformers: pros: galvanic isolation (no hum loops), gain at very low noise factor, the 'iron' sound cons: limited bandwidth, limited range of source impedances, cost, distortion at high input levels NO transformer: Pros: wide bandwidth, wide range of input source impedance, low distortion Cons: no galvanic isolation, difficult to get low noise HTH Cheers Ian |
#3
Posted to rec.audio.tubes
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Input transformer when needed ?
"wavesoft" In MIC preamps and PHONO preamps sometimes an input transformer is added that bridges the mic/phono to the first stage preamp. But many times it is done wothout any transformer , so what is the rule ? When input transformer is needed and when not ? ** Tubes are not well suited to low impedance, low level signal sources - cos they inherently have too much voltage noise. Using a step up transformer changes that situation by boosting both the impedance and signal level of the source to one better suited to tube amplification. There is no one simple rule about using such transformers as there are so many different possible circumstances and applications. What you have just posted is just another, meaning free dumb TROLL. Why don't you get real - PAL - ask the ACTUAL question you REALLY want to know about. I will not hold my breath waiting for any anonymous fool like you to respond. ...... Phil |
#4
Posted to rec.audio.tubes
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Input transformer when needed ?
Dear Phill ,
Do you have to poison this important group with your private frustraions ??? Be well "Phil Allison" ëúá ... "wavesoft" In MIC preamps and PHONO preamps sometimes an input transformer is added that bridges the mic/phono to the first stage preamp. But many times it is done wothout any transformer , so what is the rule ? When input transformer is needed and when not ? ** Tubes are not well suited to low impedance, low level signal sources - cos they inherently have too much voltage noise. Using a step up transformer changes that situation by boosting both the impedance and signal level of the source to one better suited to tube amplification. There is no one simple rule about using such transformers as there are so many different possible circumstances and applications. What you have just posted is just another, meaning free dumb TROLL. Why don't you get real - PAL - ask the ACTUAL question you REALLY want to know about. I will not hold my breath waiting for any anonymous fool like you to respond. ..... Phil |
#5
Posted to rec.audio.tubes
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Input transformer when needed ?
"RealInfo" ** Dear Brain Dead TROLL - kindly go drop ****ing dead. ..... Phil |
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