Let's See Your Transformers!

FullRangeMan · « **Reply #200 on:** 11 Feb 2017, 10:46 am »

The original WE300B were far from linear and sound different from the current crop of 300B tubes, it had no treble and no bass, it had just midrange.

E55l2 · « **Reply #201 on:** 2 Apr 2017, 07:50 am »

E55l2 · « **Reply #202 on:** 25 Mar 2018, 06:29 pm »

FullRangeMan · « **Reply #203 on:** 25 Mar 2018, 08:27 pm »

I have never see a transformer spike like this,
what would be the cause of this?

(The Manufacturer site say grounded secondary)

sfox7076 · « **Reply #204 on:** 4 Apr 2018, 05:20 pm »

I am sure that it was the test conditions or equipment. You would need a spectrum analyzer to see what was going on, but no transformer I know of can can just spike like that. It defies the laws of physics for the transformer to do it alone.

E55l2 · « **Reply #205 on:** 7 Apr 2018, 02:20 pm »

FullRangeMan · « **Reply #206 on:** 7 Apr 2018, 07:52 pm »

Quote from: E55l2 on 7 Apr 2018, 02:20 pm

I am affraid some transformers do have those spikes. See also: http://www.sacthailand.com/Transformer_OutputTestGraph.html
You see there are more transformers with such behaviour.

1628SE is a Hammond OPT not SAC,
it have a big 5kg core 30W too bad.

However its only 4dB and they use M6 and accept custom orders.
What is the cause of this?
What is the sound effect?

E55l2 · « **Reply #207 on:** 7 Apr 2018, 09:22 pm »

FullRangeMan · « **Reply #208 on:** 7 Apr 2018, 09:33 pm »

Quote from: E55l2 on 7 Apr 2018, 09:22 pm

A 5kg transformer with EI core is just a small transformer for a good 300B amplifier, a C-core has at least 50% more efficiency with the same core dimensions (weight) not to mention m6 is nowadays not a good quality, we need at least m1 or better (HiB, M0)
It's not only a 4 db dip but also the phase response is bad.

Hm very instructive, this caused by what?
Bad winding?

E55l2 · « **Reply #209 on:** 9 Apr 2018, 08:45 am »

FullRangeMan · « **Reply #210 on:** 13 Apr 2018, 02:24 am »

Quote from: E55l2 on 9 Apr 2018, 08:45 am

yes, it has all to do with winding technique.
btw you can see that almost all Monolith Magnetics have a very sharp cut of frequency response, even more then 12dB/oct.
It's nice to see that they have high frequency bandwidth but i guess the phase response is pretty bad.

The Hammond 1628SE OPT showed in that site is a old model no more in production, the current model is the 1628SEA, I dont know how perform the new model.

FullRangeMan · « **Reply #211 on:** 13 Apr 2018, 02:47 am »

Other transformers in this test are:

FullRangeMan · « **Reply #212 on:** 13 Apr 2018, 02:49 am »

The best OPT in this test:

FullRangeMan · « **Reply #213 on:** 13 Apr 2018, 02:50 am »

FullRangeMan · « **Reply #214 on:** 13 Apr 2018, 02:51 am »

FullRangeMan · « **Reply #215 on:** 13 Apr 2018, 02:51 am »

FullRangeMan · « **Reply #216 on:** 13 Apr 2018, 02:52 am »

FullRangeMan · « **Reply #217 on:** 13 Apr 2018, 02:55 am »

An for cake cherry the Yamamoto 45 amp in all amorphous core:

FullRangeMan · « **Reply #218 on:** 24 Apr 2018, 05:31 am »

Scrool down the page for a Hammond 125ESE OPT comparing to Tango U808 etc
Do find Hammond 125ESE argumernt to fast search:
http://jelabsarch.blogspot.com.br/?view=classic
One of the Hammond OPTs units are odd, other good(Stereo) posted in 30Jun2012.

Emil · « **Reply #219 on:** 13 May 2020, 11:56 am »

When I think of an SET amp, I think of the 300B tube but I'm seeing manufacturers using EL34s, Kt150, Kt120s, KT88s you name it.

Assuming that the 300B is still king, what tube comes closest?

Any personal experiences here?