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In Reply to: RE: Harmonic distortion reduction in SET amplifiers posted by used-hifi on October 05, 2016 at 08:59:00
When you parallel you get a choir effect, as the two devices are not precisely and EXACTLY the same.
Jeff Medwin
Follow Ups:
Posted by used-hifi (A) on October 05, 2016 at 11:45:26
Hello my friend
So what your saying is Sukuma is also not correct in that each tube will have a different spectrum of harmonic distortion and hence no cancelation?!
But until I have my lab setup which will not be for some time I can only speculate like Sukuma
Jeff I'm going to build a very excellent sounding single ended amplifier for my large Fulton system this is only the first stages of thoughts I want low distortion without feedback as per me Fulton has so kindly refered to
Lawrence
Have a great day!!
Having lived, breathed, and owned things Fulton since I met him in 1978, I think you are on an impossible mission.You can NOT use SETs with such inefficient speakers. I built an all DHT tube amp on EIGHT chassis, from 1983 to 1985, with Mr. Fulton's intense "all-in" coaching, 6B4Gs in P-P-P, and it was NOT the answer to powering a large Fulton speaker.
SETs are likely best employed with three speaker brands : ALTEC, JBL and ALE .
The amp you want to use in 2016 on is a big Spectral on that load. Look into it, and HEAR one on your speaker !! :-)
Jeff Medwin
Edits: 10/05/16
Jeff I appreciate your input but I'm going to build one ....heck Tom M talked about it too....I have a feeling that a pset amplifier gm70 or even a single gm70...will power my large Fulton just fine
Remember we used and still use a little 25 watt SS to real good effect as you know power is not everything but passing the musical information in a dynamic realistic way is what counts
I am not a spectral fan at all yuk sorry no offense
P.s I listen to my pset 1626 on my fathers altec Valencia every night very dynamic but certainly not my big Fulton speakers
Lawrence
Guys have a great night 👍👍👍
When you settle on an audio circuit, tubes, currents, contact me and I will give you " my take " on a supply for same .
Here is what I will say, as soon as you go above about 3 Watts on SE amps, you are compromising, versus a 3 Watt or less SE amp. However, it requires high efficiency speakers, to HEAR these differences.
In your low efficiency speaker load, one is forced to use bigger tubes. So, the question becomes, can YOUR PSET design beat the best-designed of today's solid state amps.
Have fun with it !!
Jeff
Hello Jeff !
I hear what your saying my friend and I will take any information that you have to make it really good
I started I out building idht set amps 16 years ago I moved away fro them because Ithey were not good enough plus all the other amps I heard my best hands down but still would not pass muster!!!!
I want to build and play with a gm70 drivin with a Russian 41pl simple 2 stage amplifier
This should be a good start for my preamp I still want to use my hk430 because it has a fantastic tuner and I can eaisily run low level outputs to the amp
Lawrence
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