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LOL I measure every vintage amp I restore… They do not quote at 1W… its at rated power…

Thats garbage lol, never seen other manufacturers quote their figures from such a low wattage. It is normally done at 1Khz @ rated power and weighting which is putting your thumb on the scales also lol. Mcintosh of all companies lies through their ass constantly and don’t remotely resemble what...

It’s a power amp lol, like I said I have 3 power amps, all have multiple inputs and gain control. You can bypass the volume also. There is no degradation from switching XLR input signals. An integrated is usually classed by having a phono section, active preamp with tone controls etc. Whatever...

All modern amplifiers worth any look at have speaker protection relays for power on / off thumps and DC detection. I have never heard anything of the sort from my LA90 and managed to even trigger the protection a couple times with overloads. Worked great. Correct, most power amps dating back to...

I have 3 “power amps” that have input switching and volume control. The volume is an attenuator, not an active preamp. I don’t know of many amps with XLR inputs that use any sort of active preamp for them and the volume can be bypassed completely so it’s technically a power amp.

Im testing an Edcor output transformer currently based on a recommendation from Kevin, it definitely won’t run bare linearly like a LL1630 but it definitely has far more capabilities with some external resistors etc… Ill be doing a video on it shortly as soon as I finish my audio analyser…

Yeah I think the LL1630 still has its place… its insanely linear / well behaved out of the box with no resistors etc but yeah if you want more voltage swing, gotta step up to bigger options… A shame they couldn’t maintain similar characteristics to the LL1630 with more capabilities…

Yeah… it really hurt, but hey if they’re that good I can live with it, gives me time to try another bias design while I wait for them :)

Fair enough, thought I saw someone who managed hit it but I didn’t look closely so probably wrong :) Those Edcor transformers really hurt me to send to Australia, cost me as much in shipping as the transformers did :facepalm:

It’s all a clusterf to be honest, especially as measuring such audio performance at such voltages is tricky / no industry standard of measurement… not just about voltages but the loads being driven. Because there is barely any current available on direct drive, using a demanding load will pull...

Oh I misread thought u were looking for one

Hunt down someone to make you a proper transformer box for the less money or go DIY if you’re capable. The iESL definitely isn’t worth the inflated prices these days now its out of production nor is their new all in one amp which uses those transformers also… It is nice that a retail product...

I shall revisit but seems to mirror the existing concerns of the STAX guild who claim direct drive amps struggle mostly in the high frequency department and when I increased the load with a parallel or series resistor, a corresponding drop in max voltage output was observed but had a greater...

Thanks for that, the common STAX Lundahls are the LL1630 which is what I use. Sounds good at 100v, I did my tests at 150v with a 120pf load though transformers don’t seem to care really just the direct drive amps at high frequencies. I only have limited gear to test though so I was mainly...

It’s very expensive for a transformer based amp, too expensive and limited in my opinion. Jack of all trades, master of none.

Too expensive for what it is and cannot use better amplifers

You cannot buy the iESL anymore so the comparison is redundant. That said I doubt the iESL transformers have the capability to match Lundahl transformers.

Thanks for that indepth data, did you do any testing of the FR at higher voltages (Say 150vRMS?) I found that quite interesting when comparing the SRDs and Lundahl transformers to see if the transformers easily saturate at lower frequencies and how flat they hold at louder volumes.

Glad you’re on here also

Passing this on from FB… Nice that someone actually approached them about it