New Budget Output Transformer - Page 2

K.A.B · 23rd November 2020, 05:00 PM

Due to the more expensive shipping and custom fees Lundahl opt are more tempting too buy.

Windcrest77 · 23rd November 2020, 05:24 PM

Those prices are so low, im skeptical how they actually make a profit. It would be interesting to do some A B C comparison testing using the same amp, by swapping out with equivalent Hammond and Edcor and Antek units and printing off the same tests for each, and recording some MP3 files of each model through a dummy load to hear anything different.

mike567 · 23rd November 2020, 06:48 PM

I have bought from Matt. There is no 8 week wait. This dude ships fast!

astouffer · 23rd November 2020, 07:01 PM

While on the subject of cheap transformers these caught my eye 1pair 3.5K Amorphous Single-ended Output Transformer for 6P6P KT66 2A3 tube amp | eBay

wrenchone · 07:48 PM

I dunno - using a conductive house clamp around the coil doesn't look like a good idea...
Correction - they're using the hose clamp to hold the cores together, and that's OK.

I've been wanting to try some transformers from MPS for a while. I have one of their power transformers, and I may pony up for a pair of the 5k HiFi SE transformers

Windcrest77 · 23rd November 2020, 07:46 PM

Quote:

Originally Posted by astouffer

While on the subject of cheap transformers these caught my eye 1pair 3.5K Amorphous Single-ended Output Transformer for 6P6P KT66 2A3 tube amp | eBay

Interesting it says double C core but I only see one core. I like the ingenuity and resourcefulness though the guy re-using the cores.

6A3sUMMER · 24th November 2020, 04:33 AM

The link says Amorphous.
Then it says:
"The use of imported second-hand amorphous alloy sheet winding"

I never knew that a sheet of material was 'amorphous'.
Perhaps something lost in the translation from Chinese to English.

I am not a materials expert.
But I never desired to purchase any amorphous core.
I missed that boat of opportunity.

50AE · 24th November 2020, 06:50 AM

It looks like genuine amorphous core, although I wouldn't by this. Looks like a 1W OPT @25Hz core at best. This is why it's cheap

Wavebourn · 24th November 2020, 08:38 PM

Quote:

Originally Posted by 50AE

It looks like genuine amorphous core, although I wouldn't by this. Looks like a 1W OPT @25Hz core at best. This is why it's cheap

And you are right. I bought and measured them. You do not need 25 Hz from a small amp, so for 2-3W it would be good.

drteming · 29th November 2020, 02:37 PM

Got the spud amp built, 3.5W output. The -3dB points are at 30 Hz and 30 kHz, though there is a bit of distortion under 40 Hz. The tubes are 6T9 so it's semi-comparable to my 6SL7/6V6 SE amp with Edcor GXSE-10 OTs. At similar volume, I can't tell any significant differences.

23rd November 2020, 05:00 PM	#11
K.A.B diyAudio Member Join Date: Nov 2005 Location: Sweden	Due to the more expensive shipping and custom fees Lundahl opt are more tempting too buy. __________________ I am looking for my system to be musical, not as I experience modern systems to convey details without feeling, as we have different references, there are no right and no wrong.

23rd November 2020, 07:44 PM	#15
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	I dunno - using a conductive house clamp around the coil doesn't look like a good idea... Correction - they're using the hose clamp to hold the cores together, and that's OK. I've been wanting to try some transformers from MPS for a while. I have one of their power transformers, and I may pony up for a pair of the 5k HiFi SE transformers Last edited by wrenchone; 23rd November 2020 at 07:48 PM.

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23rd November 2020, 05:24 PM	#12
Windcrest77 diyAudio Member Join Date: Feb 2019 Location: Lockport, IL USA	Those prices are so low, im skeptical how they actually make a profit. It would be interesting to do some A B C comparison testing using the same amp, by swapping out with equivalent Hammond and Edcor and Antek units and printing off the same tests for each, and recording some MP3 files of each model through a dummy load to hear anything different.

23rd November 2020, 06:48 PM	#13
mike567 diyAudio Member Join Date: May 2011 Location: here	I have bought from Matt. There is no 8 week wait. This dude ships fast!

23rd November 2020, 07:01 PM	#14
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	While on the subject of cheap transformers these caught my eye 1pair 3.5K Amorphous Single-ended Output Transformer for 6P6P KT66 2A3 tube amp \| eBay

24th November 2020, 04:33 AM	#17
6A3sUMMER diyAudio Member Join Date: Jun 2016	The link says Amorphous. Then it says: "The use of imported second-hand amorphous alloy sheet winding" I never knew that a sheet of material was 'amorphous'. Perhaps something lost in the translation from Chinese to English. I am not a materials expert. But I never desired to purchase any amorphous core. I missed that boat of opportunity.

24th November 2020, 06:50 AM	#18
50AE diyAudio Member Join Date: Jul 2011 Location: Sofia, Bulgaria	It looks like genuine amorphous core, although I wouldn't by this. Looks like a 1W OPT @25Hz core at best. This is why it's cheap

29th November 2020, 02:37 PM	#20
drteming diyAudio Member Join Date: Apr 2016 Location: Directly over the center of the Earth	Got the spud amp built, 3.5W output. The -3dB points are at 30 Hz and 30 kHz, though there is a bit of distortion under 40 Hz. The tubes are 6T9 so it's semi-comparable to my 6SL7/6V6 SE amp with Edcor GXSE-10 OTs. At similar volume, I can't tell any significant differences.