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Re: Input Sensitivity and Interstage Transformer

Posted by KevinC (M) on October 31, 2003 at 07:31:52

In Reply to: Input Sensitivity and Interstage Transformer posted by HKL on October 31, 2003 at 05:50:52:

It's all about system matching and personal biases. I use a TVC normally for volume control, so I need a bit more gain than someone with an active line stage. Even the lovely sounding Raleigh Audio active line stage kit that I sell has relatively low gain (5dB) in its usual connection. However, it has provision for increasing the gain by reconnecting the input transformer for 6dB additional gain for a total of 11dB. My experience in retail audio taught me that most systems have too much gain, not too little, because manufacturers err on the side of more gain than less, because consumers can always reduce gain with the volume control. Unfortunately, that results in a noise and dynamics trade-off if carried too far, though.

I would continue to use an interstage, but use it 2:1+1 or 1:1 for SE. Output tube drive is a critical part of the sound of power amplifiers. The use of wimpy driver tubes with high Rp was never a successful design measure in my hands.

Unfortunately I know of no octal tubes that have 40+ mu and low plate impedance.

Kevin Carter
K&K Audio
www.kandkaudio.com

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