Al, a couple of things I pointed out to Grannyring were that I did in fact speak with Bill Whitlock back in Aug, 2010, and posted about my conversation in another thread that you too were involved in. I hadn't remembered that thread, but I found it in a search. I was using a Lamm LL2 Dlx at the time, which has a rising output impedance at low frequencies and my concern was bass roll-off. My post is at the end of the thread here;
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1280795210&read&keyw&zzbill=whitlock
Bill basically told me the Jensen posted specs apply to the "worst case" scenario where the load is 10K ohms. Good news for Grannyring is that the input impedance of his Atlas amp is enormous at 940K ohms! Here is what JA at S'phile had to say;
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1280795210&read&keyw&zzbill=whitlock
Bill basically told me the Jensen posted specs apply to the "worst case" scenario where the load is 10K ohms. Good news for Grannyring is that the input impedance of his Atlas amp is enormous at 940K ohms! Here is what JA at S'phile had to say;
The Atlas's voltage gain into 8 ohms was the same for balanced and unbalanced drive, at 25dB, which is lower than normal. Both inputs preserved absolute polarity (ie, were non-inverting), the XLR jacks being wired with pin 2 hot. Specified at a very high 470k ohms for the unbalanced input and twice that for the balanced, the amplifier's input impedances were at least those values at low and midrange frequencies, dropping slightly but inconsequentially at 20kHz. (With such high impedances, there is inevitably a large error in measuring the exact figure.) The Crossover inputs behaved identically to the main inputs in these respects.I suspect with such a large input impedance, Grannyring is good to go with the transformers.