No - feedback amplifier - Page 8

Telstar · 26th January 2013, 09:31 PM

Quote:

Originally Posted by Leakstereo20

I am perhaps too late out because the number of DIY electronic girls and boys has plummeted during the last two decades.

true

Gudmund · 27th January 2013, 11:32 AM

The End mk.3.1 main PCB 60mm x 107mm at TUBEAMP

Picasa Web Albums - vbkolsen - The End mk. 3...

Leakstereo20 · 30th January 2013, 02:09 PM

L.C. Audio is looking for material used to The End mk.3.1 ....alternatively Millennium.

Is there still files and material for the two DC amplifiers, they try to return with a price estimate.

Gudmund · 6th February 2013, 05:01 PM

Anyone who knows replacement transistors for the discontinued Sanken 2SC2922 and 2SA1216?

2SC3722K smd seems to have data like 2SC2240 exept for the noise.
0,2dB/100uA for 2SC1455 and 0,5dB/100uA for 2SC2240
2SA1455 smd with data as 2SA970 ...exept for the noise.

2SA970/2SC2240 could be used as input pair in The End mk.3.1??

The End mk.3 PCB:

https://picasaweb.google.com/vbkolse...81461722260994

The End mk.3 schematic:

https://picasaweb.google.com/vbkolse...25839818957314

Leakstereo20 · 7th February 2013, 02:46 PM

Quote:

Originally Posted by Gudmund

Anyone who knows replacement transistors for the discontinued Sanken 2SC2922 and 2SA1216?

2SC3722K smd seems to have data like 2SC2240 exept for the noise.
0,2dB/100uA for 2SC1455 and 0,5dB/100uA for 2SC2240
2SA1455 smd with data as 2SA970 ...exept for the noise.

2SA970/2SC2240 could be used as input pair in The End mk.3.1??

Not sure that Sanken 2SC2922 and 2SA1216 are discontinued.

Not sure whether "2SA970/2SC2240 could be used as input pair in The End mk.3.1??" ....either?

Cuda · 22nd February 2013, 08:03 PM

http://products.semelab-tt.com/magnatec/bipolar.shtml

MG633x/MG941x ?

Leakstereo20 · 11th March 2013, 06:16 PM

Quote:

Originally Posted by Cuda

Complementary Bipolar Power Transistors for High Power Audio

MG633x/MG941x ?

...have looked at the site you mentioned. I have never heard of or used any Semelab transistors like the above listed types.
I was looking for the ring-emitter types for output, because they are fast and linear. Secondly because the MT200 house indicates a good heat dissipation due to the large metal plate.

27th January 2013, 11:32 AM	#72
Gudmund diyAudio Member Join Date: Feb 2010	The End mk.3.1 modules The End mk.3.1 main PCB 60mm x 107mm at TUBEAMP Picasa Web Albums - vbkolsen - The End mk. 3...

30th January 2013, 02:09 PM	#73
Leakstereo20 diyAudio Member Join Date: Oct 2011 Location: Close to Copenhagen	Price estimate L.C. Audio is looking for material used to The End mk.3.1 ....alternatively Millennium. Is there still files and material for the two DC amplifiers, they try to return with a price estimate.

6th February 2013, 05:01 PM	#74
Gudmund diyAudio Member Join Date: Feb 2010	Replacement transistors Anyone who knows replacement transistors for the discontinued Sanken 2SC2922 and 2SA1216? 2SC3722K smd seems to have data like 2SC2240 exept for the noise. 0,2dB/100uA for 2SC1455 and 0,5dB/100uA for 2SC2240 2SA1455 smd with data as 2SA970 ...exept for the noise. 2SA970/2SC2240 could be used as input pair in The End mk.3.1?? The End mk.3 PCB: https://picasaweb.google.com/vbkolse...81461722260994 The End mk.3 schematic: https://picasaweb.google.com/vbkolse...25839818957314

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22nd February 2013, 08:03 PM	#76
Cuda diyAudio Member Join Date: Sep 2009	http://products.semelab-tt.com/magnatec/bipolar.shtml MG633x/MG941x ?